What is the Best telephoto Zoom Lens?

Assuming a certain minimum construction quality, the best lens of any kind is the one that will do the job. If you're photographing anything dangerous, perhaps you would want a longer focal length lens, so that you won't have to get near the danger to get the shot. Having never photographed lava flows or volcanoes, I don't know how far you will be from a scene how large, so even a wide-angle may not be out of the question. Since the First Law of Photography states that if you reallyreallyreally want the shot then money is no object, get both long and short zooms.

which telephoto zoom lens should i chose for cannon 450d main use is to photograph son playing rugby 350£max?

I will guess you already have something like the Canon 18-55 mm lens. The Canon 70-300mm f/4-5.6 EF IS USM is under $550US here in the States. For a lot less, you may find the 55-200mm f/4.5-5.6 USM II Canon will suit your needs

What is the best telephoto zoom lens for my Canon Digital Rebel XT? Good optics, most versatile, lightweight.?

It's slightly expensive, but the Canon 70-200/4 L offers a great compromise between outstanding image quality and portability. It was my favorite lens when I used Canon. Bob Atkins has a good breakdown of lenses available for Canon at photo.net. Check the link below.

I just purchased a Canon Rebel XSi with a 55-250 Telephoto Zoom lens. what limitations does telephoto have?

Did you not get the standard kit lens (18 - 55 mm lens), as well? With that 55 - 250 mm lens, you can certainly "zoom in", but you have no lens for a wide shot. An 18-200 mm lens would overlap what you have.

What is the difference between a telephoto zoom and standard zoom?

For what you are shooting, nature and wildlife, the longer the lens the better, so in your case the 30-300mm will suit your needs. You may find yourself wanting something longer later, but those lenses are not zoom lenses (like the 600mm f/4.0 Canon) The difference between a standard zoom and a telephoto zoom is pretty much what it says. The standard zoom covers focal lengths that are considered to be in the standard range of use. Telephoto zooms do indeed cover the focal ranges that are considered telephoto.

what is the difference between a telephoto lens and a zoom lens?

A telephoto lens is a lens with a shorter physical body length than focal length. ie: A 300mm lens that measures 220mm long (all the distance from front element to focal plane). The same design but inverted (retrofocus lenses) is used on SLR wideangles. Not all lenses over 70mm are telephotos, only the ones following the shorter body length design. A lens with a focal length of 135 focused at infinite and the same body length is a long lens, not a telephoto. Although Telephoto is used incorrectly to name all +70mm lenses, it's accepted because of it's use. Zoom lenses have mechanisms that move lens elements to modify the magnification of the image. They can be telephoto lenses too, if, at in example, 300mm the length of the lens is 260mm. A zoom can be of different focals. 28-80mm, 20-28mm are wide to normal and wide angle zooms.

Canon EF 70-200mm f/4L USM Telephoto Zoom Lens for Canon SLR Cameras ?

Yep. It's an L. So you get a hood and a case. It's a cheaper version of the hood, that is, it's not a petal type, but you would need to get an f2.8 version for that. Doesn't make much practical difference. It's a stonking lens for the money, and really inspires confidence in use. You really cannot go wrong. Enjoy.

Can anyone recommend a good telephoto zoom lens to go with my Nikon D60?

I would suggest Sigma 70-300mm,Good telephoto lens if you're on a tight budget http://www.amazon.com/gp/product/B0012X61U2?ie=UTF8&tag=computer0bd-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=B0012X61U2

Canon EF 70-200mm f/4L USM Telephoto Zoom Lens?

Yes it is, the 70-200 range of Canon lenses are probably Canon's finest. Image quality, contrast, sharpness is superb. In fact they are often a little too detailed and sharp if you are shooting models, they pick up every pore. They are also very fast an completely silent. You will not get a better lens in that price range.

Is the Rokinon 650-2600mm Telephoto Zoom Lens a good lens for its small price?

Save your money. You're looking at a 650-1300mm f8 cheap lens that requires a 2x teleconverter to stretch to 2600mm and becomes an f16 as its minimum aperture. Save your money. This lens requires using it on a tripod - you simply cannot expect to hand-hold it. The longest lens I own is a 300mm prime with a matched 2x teleconverter and you'd be surprised how seldom I actually use the 300mm, much less with it and its teleconverter. Save your money.

Vivitar AF 100-300mm Telephoto Zoom lens Lens Not Working on Sony a230?

First, the Seller knows little or nothing about cameras and lenses if he actually said "... it fits/works with all Sony cameras (or anything with a 55mm thread) ...". 55mm is the filter diameter of many lenses. It has nothing to do with the actual lens mount. I wish you'd included a picture of the actual lens. Perhaps this forum will help you: http://www.flickr.com/groups/sony_alpha/discuss/72157610963735806/ There might be a section in your Owner's Manual on using third-party lenses.

Good "Starter" Telephoto Zoom Lens for Photography Major? (Canon Rebel xti)?

Photoace covered it - your son will appreciate having the IS feature in that type of photography.

Should I upgrade kit lens or buy a telephoto zoom?

If your shooting style has overwhelmed the limitations of the kit lens, then yes. Otherwise it sounds to me like you're putting the cart before the horse. The subject of your photography dictates the lens, not the other way around. I'd give vastly different answers for each kind of shoot. For instance, with landscapes I select one or two of several different lenses - a 300 f/4 prime, a 180 f/2.8 prime, a 28-300 zoom, a 14mm prime, a cheap but beautiful 35-80 f/2.8 Tamron SP manual zoom; a 17-35 zoom. The lens used depends on the subject, how near or far, time of day, whether I'm compositing a pano, and so on. The only rule about lenses that I follow: each must be the finest optical quality I can afford. And I bought each one only after I kept bumping up against the limitations of my existing set.

what is the difference between a zoom lens and a telephoto lens?

Telephoto Lenses I believe that a true telephoto lens is one constructed so that the length of the lens is shorter than the focal length, but in the vernacular, it has come to mean "any lens with a focal length longer than a 'normal' lens." For 35mm photography, it is usually applied to lenses 135mm and longer, although lens in the range from 75mm to 135mm lenses are sometimes refered to as "short telephoto" lenses. Zoom Lenses Some lenses have a fixed focal length, some can vary over a range of focal lengths. They are commonly called "zoom" lenses and are usually designated by the range of focal lengths they provide 28-72, 80-200, etc. Technically, many of these lenses are not true zoom lenses, but vari-focal lenses. With a true zoom lens, if the subject is in focus, then it will remain in focus when the focal length of the lens is changed. With vari-focal lenses, after zooming, the subject has to be refocused. The Best(?) of Both Worlds To confuse things further, an 100-300 zoom lens would also be called a telephoto or telephoto-zoom since its range of focal lengths are in the telephoto range. A 28-72 zoom lens wouldn't be. Last Note: Some stores will use both terms incorrectly, just because they like the way it sounds in their ads and don't care if it is accurate or not, as long as make the product sound sexy.

What telephoto zoom lens should I buy?

The newer Canon 55-250 mm is rated much better by Popular Photography magazine ( http://www.popphoto.com ) Unfortunately it's about $250 so it may be over your budget.

Canon EF-S 55-250mm f/4-5.6 IS Telephoto Zoom Lens?

ALL EF and EF-S lenses are compatible with the Canon XT, XTi, XSi, etc. Your camera store salesperson will know all this.

Is the USM lens much better than the regular Canon EF 75-300mm f/4-5.6 III Telephoto Zoom Lens?

The USM gives you much much faster auto focussing performance, so yes, I'd say it's much better then the non-USM version.

The maximum distance zoom/telephoto lens ever?

You can see Andromeda with a 50mm lens and it is 2.5 million light years away. It's hard to get much further away than that with any lens. Look up the Carl Zeiss 1700mm f4 for the Hasselblad 203 FE, that's an interesting one.

Will the Nikon Nikkor 70-300mm f/4.5-5.6G ED-IF AF-S VR Telephoto Zoom Lens work with my Nikon D40???

It will absolutely function 100% with your D40. Actually, almost any lens Nikon ever made will work with your D40 if you are willing to twist the focus mechanism yourself. That's the only compatibility problem with non-AFS lenses. If you don't trust yourself to focus, you can still use the camera's electronic rangefinder to confirm focus with a blink and a beep. From the D40 manual: "If the lens has a maximum aperture of f/5.6 of faster, the viewfinder focus indicator can be used to confirm whether the portion of the subject in the selected focus area is in focus. After positioning the subject in the active focus area, press the shutter release button halfway and rotate the lens focusing ring until the in-focus indicator is displayed." With that in mind, get any Nikon 400 mm lens that tickles your fancy. It's just a matter of how much you want to spend. Nikon does not make a bad lens that includes the 400 mm focal length. The "entry level" is the $1,400 80-400 mm VR lens. Next up is the "holy cr^p" $5,000 200-400 mm VR lens. Top of the line is the basis of a new religion - the 400 mm f/2.8 prime lens. It sells for $8,500. With that kind of investment, you would do well to get the 70-300 that you mention and tease yourself with long tele shots. I have the lens myself and find that it is quite nice for most anything. It's not as sharp as a prime lens, but take a look: http://www.flickr.com/photos/samfeinstein/tags/70300/

where can i get Canon EF-S 55-250mm f/4.0-5.6 IS Telephoto Zoom Lens for cheap pirce?

Most reputable places are selling it for a little over $200. $180 is a very good price. There are very few DSLR camera lenses that are under $200.

What advantage does a telephoto lens have over a zoom lens?

As above plus they usually have a wider aperture which makes getting those shots with a blurry background easier, and are better for low light situations. Birdwatchers often use a spotting scope with camera adapter, a cheaper way of getting extreme magnification at a low price, you can only use them wide open though (there are no aperture adjustment on them), but quality is very good. The technique is call digiscoping have a look here. http://www.digiscoped.com/Digiscopingindex.html Chris

Which is better telephoto lens or a telephoto zoom lens? ?

It depends on your needs, as well as many other factors (quality of build, glass, speed, etc.) Zoom lens means that you can change the focal range. for example, you can go from wide angle to telephoto, or go from a medium telephoto to a super telephoto. Most zoom lenses, unless they are specifically for wide angle shots, include telephoto in their range. Telephoto means that there is some magnification of the image ie. it appears closer than it really is. Some telephoto lenses are zooms (ie. 70mm-300) while other telephoto lenses are what are called primes because they only have one focal length (for example, 135mm). Prime lenses generally have sharper image quality, but zoom lenses have the advantage of versatility.

whats better a telephoto and zoom lens for landscape/nature photography?

Usually you want a wide-angle for landscapes, something equivalent to a 24mm or 28mm on a 35mm film camera. If your "crop factor" is 1.6 a 15mm would be 24mm, an 18mm would be 27mm, a 20mm would be 32mm. Any of those, 15mm, 18mm or 20mm would be fine. For nature and sports you'll want at least a 300mm lens as fast as you can afford. A 400mm would be even better. For extreme close-ups you'll want a true macro lens of 60mm to 70mm (96mm to 112mm, equivalent) which will give you a good working distance from bees and other insects.

Is the Canon EF 75-300mm f/4-5.6 III Telephoto Zoom Lens compatible with the Canon EOS T3 Rebel?

Yes, but don't bother with the 75-300- get the 55-250 IS.

What telephoto or zoom lens should I buy for my Rebel XSi?

That GREATLY depends on your price range. Since I don't know that, I would reccomend going to this site and looking at the reviews: http://the-digital-picture.com/Reviews/ I use the EF 70-200mm L.

What is the Difference between Standard Zoom Lens,Telephoto and Telephoto Zoom Lens?

Is the Canon EF 70-200 mm f/4L USM Telephoto Zoom Lens a good lens for rodeo action shots?

That depends...will it be in low light or bright sunlight? If its bright sunlight, you should be fine. But if it's low light, an f/4-5.6 is too slow, and you will have to get a fast f/2.8 lens. The "graininess" will only happen if you use high ISO's.

Will the Canon - 70-300mm f/4-5.6 IS USM Telephoto Zoom Lens Model: 0345B002 fit the Canon Rebel T2i?

Yes . The only exception for others photographers reading is the EF-S (S = set back lens design closer to mirror and sensor ) are not backward compatible on 35mm film bodies. The EF-S lens line up with the white mark on the camera's lens mount. EF lenses use the red dot on lens mount and lens.

is the built in aperture ring on some telephoto/zoom lens important?

For the EOS series, the Aperture ring is a plus but almost unnecessary. Honestly, if you know or plan on learning what the Aperture actually does, you'll find the Aperture Ring invaluable. But you'll still have control using your spin wheel in AP or Manual modes. Also, unless you have a camera with Aperture preview, you'll be guessing so again the Ring becomes only an expert feature. In case you're not sure what that means, aperture controls how much light a lens lets in at one time. The numbers are a ratio (example1:2.8 or 1:3.5, etc) but the "1 to" (1:) is normally dropped and just the last number are normally represented. Ideally, a lens would let in 1:1 but that's incredibly hard because of the mechanics. You'll notice when selecting lenses, a lower AP number is more expensive. Last thing about aperture is that it also controls your "depth of field"; which in basic terms is "how much is in focus at once". The best example would be you take a picture of a flower. If you used an AP of 2.8 only the flower would be in focus and the background is just a color blur. In contrast, if you used an AP of 18, you'll see the background pretty clearly. With a Ring, you can control the Aperture faster but isn't necessary for stationary subjects. As for lens selection, it's hard to say which lens the best; your style of photography dictates which lens is the best for you. For instance, a sports photographer will select a (high #)mm lens with the widest Aperture (closest to 1) their budget affords them. But a paparazzi/candid photographer will look into the range of focal lengths (the mm range). For general purposes, I'd recommend something like a 28-135mm lens (or something close to those numbers). This will allow a slight wide angle but you'll have the option of zooming in. Also, unless you're picky, you don't need to step up to a Canon lens. You may find Sigma and Tokina great substitutes for the price. Again, ultimately this will be decided based on your needs.

whats the difference between telephoto lens and zoom lenses?

A zoom lens just means it has a variable focal length - that is, it goes between two focal lengths. Those are both zoom lenses. It has nothing to do with the 'reach' of the lens, for example a 10-20mm lens is a zoom lens, but its at the wide angle focal length range. A telephoto is generally a lens above 50mm in length. So; Lenses can be either 'primes' (a fixed focal length) or 'zooms' (a variable focal length), so for example; 24mm lens - wide angle prime 10-20mm - wide angle zoom 50mm - mid range prime 300mm - telephoto prime 70-200mm - mid to telephoto zoom In terms of 'x times zoom' (which is how zoom is described in point & shoot camera terms), its the longer focal length divided by the shorter, so the 70-300mm is a 4x zoom, (300/70), the 55-300mm is a 5x zoom (300/55).

What's the difference between a Telephoto, Zoom, and Macro lens?

* A Zoom lens is a lens that has a continuously variable focal length; such as 28-70mm lens. A lens with a fixed focal length is commonly called a Prime. * Telephoto means that the focal length of the lens is longer than diagonal of the format. Telephoto lenses are available in Zoom and Prime versions. * Macro lens is also known as a Micro or Close-up lens. A true macro projects an image onto the sensor/film that is the exact same size as the object. For example: if the object is 2 cm long then the image of that object projected on the sensor/film is also 2cm long. It is called 1:1 magnification.

Can't decide between a telephoto, zoom, or macro lens for DSLR!!!***?

So much here depends on you as a photographer. I do not shoot much telephoto, so my vote is that you should look at getting a quality macro lens. They are not cheap but they open up a whole new world by allowing you to come in close and shoot. Check out what Canon has for a macro lens but also check out the options from the respected independent lens makers, like Tamron, Sigma, and Tokina. (links to these companies websites are below). Get a real macro lens, not just a zoom lens that states it has macro. Below I also listed 2 photo dealers so you can shop around but also these sellers have customer reviews of products and that can be of assistance. That is my advice..... or you can go get a telephoto zoom. : ) Hope this helps. Mark

Any ideas on a good telephoto zoom lens?

I think that is a good option but some other options to consider are also Tamron and Sigma lenses made for Canon and to also consider a zoom that can go to 300mm (there are some 70-300mm and 75-300mm zooms to check out). The first link below is to a list of telephoto zooms for Canon, listed lowest price first. There are also customer reviews for most of these lenses also. I also added some other seller website links. Hope this helps. Mark

What is a decent telephoto zoom lens for a Canon Digital Rebel camera in the $250-$500 price range (if any)?

I'd recommend Canon EF 70-300mm f/4-5.6 IS USM ($482). This lens is highly rated in various reviews. Image quality is good between 70-200mm. It also has image stabilization which helps to reduce blur especially shooting in long focal length.

Whats the difference between Canon EF-S 55-250mm f/4.0-5.6 IS Telephoto Zoom Lens & the Canon EF 75-300mm lens?

the 55-250mm is the better lens if you dont mind cutting off 50mm at the end. it has IS, and its pretty sharp wide open, and really sharp stopped down till about 250mm, where it gets a little soft the 75-300mm is a little soft wide open, and a little sharper stopped down, but after about 200mm, it gets noticeably softer, more so than the 55-250mm also the 55-250mm features a UD (ultralow dispersion) lens element that corrects for chromatic aberrations, (which is virtually nonexistent on this lens, i had never had a problem with this lens) you'll appreciate the IS especially on a long telephoto like the 55-250mm which gives you the EFOV of a 400mm lens, which means you'll need to shoot at roughly 1/400th of a second without IS to get sharp pictures (1/500 for the 75-300) if you do need the 300mm range, the 70-300mm is optically better.

What is the difference between a telephoto lens and a zoom lens?

Your 18-55mm lens is a zoom lens, all it means is that the lens has a variable focal length between X and Y. A telephoto lens is one that is greater focal length than the "normal" lens for a particular type of camera. On a 35mm, that is anything more than 50mm. On a 645 or 6X6, that is anything greater than an 80mm. On your Digital Rebel with the 1.6x crop factor, it is anything greater than about 35mm. Your 18-55 is actually a short telephoto, with an equivalent field of view of approximately 29-88mm as compared to a 35mm camera. What you can get to fulfill your need varies mostly with your budget. The Canon 75-300 III is the least expensive method to get a lot more reach, but is also the worst option. Better, yet still fairly low cost, is the Sigma 70-300 APO. Make sure it is the APO version, there are several. Upping the budget a little, there is the Canon 55-250 IS, supposed to be a pretty good lens. For another step up in price, there is the Canon 70-300 IS, which is an image stabilized version of the lens, but is a much better lens to begin with. For only a little more, you can get the Canon 70-200 f/4 L, a constant aperture zoom. Anything with an L in the name is a good lens. Even the 28-300 IS, even though it costs $2,300.

What is a good zoom/telephoto lens for the Nikon D60 at under $400?

I would go with what Nike said. It's a good pick even for a third party lens. There's also a Nikon 55-200mm f4-5.6G ED AF-S DX or Nikon 55-200mm f/4-5.6G ED IF AF-S DX VR Zoom Nikkor Lens which is a continuation from its standard lens. If you're going for landscape photography, you can also get a polarizing filter (considering you dont have one) to get some contrast between the sky and the landscape. I'm into landscape and cloudscape photography and it is really annoying when there's too much light and i cant get much contrast between the colors.

What kind of Zoom Telephoto Lens can fit on a Canon PowerShot SX110 IS?

While there are some inexpensive add-on lenses you can put on some P&S cameras, the quality of the images will be relatively poor when compared to a true interchangeable lens used on a DSLR.

Hi Need a Cheap Telephoto Zoom Lens?

You didn't tell us what camera you are using, but if it is a typical DSLR, you will want at least 300mm for most bird shots and 400mm is even better. If you are using a full format DSLR or a 35mm film camera, you will want at least 400mm for most bird shots and 600 or 800mm is even better. If you come back and "add details" telling us what camera you have and how much you can spend on this lens, maybe someone can make a specific recommendation. 300mm on an APS-C sensor: http://www.flickr.com/photos/samfeinstein/3636876525/ http://www.flickr.com/photos/samfeinstein/3317764611/ Even that's not enough sometimes: http://www.flickr.com/photos/samfeinstein/3978289219/ http://www.flickr.com/photos/samfeinstein/3317769775/ http://www.flickr.com/photos/samfeinstein/3559300878/ Wildlife shots in general: http://www.flickr.com/photos/samfeinstein/tags/wildlife/

What is the difference between a wide-angle, a wide-zoom and a telephoto zoom lens?

Well traditionally a wide angle lens is a fixed focal length lens that is greater than 35mm. so thus a 14mm is a wide angle lens (very wide) and a 28mm is a wide angle lens. A wide angle zoom is just that one that is a zoom lens in the wide angle range. Some of the most popular are the 16-35 and my fav, the 17-40 F4 by canon. They also make a efs wide angle designed for crop sensor cameras, a 10-22 and its also nice if you really need it that wide. 99% of people dont and only think they do. Often when I am shooting my 17-40mm I am not wide open unless I am doing a coast shot or a close up. As you will often have too much sky or foreground in your shot, unless you crop it to go panoramic and then you will need a very good grade camera to do that kind of croping and also be shooting it at a very low ISO... A telephoto lens is liek a 200mm or 300mm lens. And a telephoto zoom would be a lens that zooms in that range, like the 75-300 or the very nice Canon 100-400mm L IS lens. And keep in mind most bodies have a crop factor so that will extend the range of your lens, so the Canon 100-400 on a 40D or Rebel is liek shooting a 160-640mm lens on a film or for frame body. Also when it comes to lenses, you get what you pay for. If the range is to long, like a 6x or 10x range, the image quality is going to be lower and yoru images softer. Perfect example is the crappy sigma 50-500mm lens. The images are very very soft at 500mm and you cant crop in on them or enlarge them too much! Hope this helps

what would be a affordable and sharp telephoto zoom lens for canon?

well check out sigma 18-250 or tamron 18-270 , or 18-200 from canon , or 55-200 or 70-300 there are many such lens , there are many places where you can rent the lens , what's affordable for you ? you should write it .

The lens hood designed to fit my telephoto zoom lens is sold out. Would another lens hood fit?

I found this on amazon: http://www.amazon.com/Canon-ET60-Lens-75-300mm-4-0-5-6/dp/B0000AE66P for the non-IS version. If you search amazon, they also have one for the IS version as well, in stock. You can also find a third-party hood on ebay.

What's the difference between standard zoom lens and telephoto zoom lens?

Their focal lengths. Wide angle zoom ~ 10-24 mm Standard zoom ~ 18-55 mm Telephoto zoom ~ 200 -400 mm There you have it.

what type zoom lens or telephoto lens suit Canon SX130IS?

you cannot change lenses on that camera

Has anyone used a Rokinon 650-2600mm Telephoto Zoom Lens for Nikon? What do you think?

This is a good brand but perhaps you might want to take a look at other models. Here is a good place that lists resources and several types of nikon zooms right from ebays auctions: http://nikonzoomlenses.net

What is the difference between a regular "zoom" lens and a telephoto lens?

"Telephoto" refers to a specific way to design a lens which allows the lens to be physically shorter than it's actual focal length. Most lenses longer than 75mm or so(for 35mm cameras) are a telephoto design, although there are lenses longer than this that are not telephoto lenses. A zoom lens is a lens on which the focal length can be changed. Technically, in order for a lens to be called a zoom lens, the point of focus needs to stay the same as the focal length as changed, although few lenses do this. It's possible to have a zoom lens which uses a telephoto design-this is very common for zoom lenses where part of the focal length range is greater than 75mm. It's also possible to have a zoom lens which does not use a telephoto design. So, to answer your question, telephoto and zoom are terms which have totally different meanings, and are not mutually exclusive.

What can you tell me about the Canon - 70-300mm Telephoto Zoom Lens?

It is a Canon lens, so cannot be terrible. USM means that it auto-focuses very fast and quietly and IS means you can hand hold it without getting blurred images if you are reasonably careful. It is a rather inexpensive lens you can use for shooting field sports, wildlife and other subjects you cannot get close to (like air shows). Unless you have a whole lot of money and can afford a nice 70-200 mm f/2.8 AND a 300 mm f/2.8 lens, the 70-300 mm is just fine.

Is a Telephoto zoom lens a Macro lens too?

Macro means close up...usually 1:1 or the actual size of the object being photographed A zoom telephoto "with macro" merely means that the closest focusing distance has been reduced to allow you to get close to the object and the magnification gives you a 1:2 or better image. In reality the bulk of the lens and the reduced aperture makes them a little difficult to use for real macro work but it can be useful.

Is there an advantage to shooting portraits with a telephoto zoom lens on an slr?

A fast one would be more useful. I usually use 135 mm f 2--but I have not used anything longer. When the subject is close to the camera, like a head shot, at f 5.6 ( http://www.flickr.com/photos/little_pooky/4504148835/ ) I still get blurry background. If you have that zoom--try it. If you're thinking about buying it, it's better to spend more to get faster lens. Even if you do'nt use it at f 2, you will still focus at f 2.

perspective distortions with telephoto zoom lens?

I have, on occasion, taken portraits of horses for clients. Full on side views were no problem, since most of the horse's body was, essentially, on the same plane. It was in taking 3/4 views that I discovered a problem. With my regular lens, I found that the horse's head loomed HUGE, while the body diminished in size, farther back. The result was very freaky looking, giant headed horsies! The solution was to mount my telephoto lens. (The 100mm worked fine) I stepped back, away from the horse, and the distortion went away. From a far enough distance, even the huge animal's entire body was, pretty much on the same relative plane. Think of fisheye lens in reverse. No distortion and happy, paying clients!