another clueless Canon owner...

L

Lucian

Carbonite Member
I actually own an EOS20d, but I don't know much about it, except how to take pics.
1)is it the same APS-C format as the 7d? Same lens family?

2)I own an 18-55mm zoom, if it's the same lens family, what would be a nice inexpensive longer zoom? I'm totally down for buying off brand, like Tamron, if it'll save some coin.
 
If you're shooting video than the noisy AF motor shouldnt be a bother :) Killer lens, I highly recommend it.
 
Lucian said:
Is this it? http://www.bhphotovideo.com/c/product/533555-REG/Sigma_579_101_70_200mm_f_2_8_II_EX.html

Now is there a crop/magni factor with this lens?
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Perhaps Kholi's right, and we should get away from using the terms "crop factor" and "magnification factor" in the discussions here.

All 18mm lenses give the same FOV on an APS-C camera, whether the they are designed for full-frame or for crop-sensor cameras. If you're used to APS-C already (and you sound like you are), then you don't have to worry about "crop factor" at all.
 
ydgmdlu said:
Perhaps Kholi's right, and we should get away from using the terms "crop factor" and "magnification factor" in the discussions here.
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Disagree. Why cause confusion? Because there IS a crop factor. There's no reason to sweep it under the rug.

A 28mm on a crop body - while the "same" FOV as S35 - is still cropped from a 35mm image. This should be the norm, the canned response. These are photo cameras first, video cameras second. Let's keep things straight.
 
But we're talking exclusively about video usage here, for one. And secondly, the OP said that he's coming from another APS-C camera, so the whole crop factor issue isn't relevant to him. The whole point is to avoid confusion. You don't want him to start thinking that an 18mm lens designed for a FF camera will have a different FOV than an 18mm lens designed for a crop-sensor camera. The fact that he even asked whether a lens had a crop factor or not shows that he's already confused, to some degree.
 
Taylor Rudd said:
Disagree. Why cause confusion? Because there IS a crop factor. There's no reason to sweep it under the rug.
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So by that logic, we should mention every possible crop factor. Like:

"Hey guys! I was tempted with the new Canon 50mm 1.4 (50mm in FF/VistaVision, ~80mm on APS-C, ~100mm on u4/3, ~200mm on 2/3", ?? in super16, ??mm on Medium Format, ??mm in IMAX, etc...)"

This is a video/cinema forum. Moreover, we are in the Canon 7D section, which happens to be an APS-C camera. Always coverting to FF equivalent FOVs is tedious and won't mean much to newbies to DSLRs coming from HVX* or EX*.

Quoting myself from another thread:

Seriously though, for anyone reading this, if you have no intimate knowledge of FF field of views already, instead of fudging around with crop factors and equiv. FOVs, just take 5 minutes to remember this:

On APS-C cameras:

< 17mm = very wide
17-28 = wide
35 = "normal"
50 = medium telephoto
85 and > = telephoto

That's it! Just forget the FF equivalents!
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You don't want him to start thinking that an 18mm lens designed for a FF camera will have a different FOV than an 18mm lens designed for a crop-sensor camera.
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An 18mm on an FF camera DOES have a different FOV than an 18mm on a crop body, as you said in your earlier post.

All 18mm lenses give the same FOV on an APS-C camera, whether the they are designed for full-frame or for crop-sensor cameras. If you're used to APS-C already (and you sound like you are), then you don't have to worry about "crop factor" at all.
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You are absolutely correct. The focal length of the lens is independent of what kind of camera the lens is used on. My Canon 17-40mm f/4L has a different FOV on the 5D than on the 7D, even though the focal length is still 17mm at the wide end.

Now, Lucian may have thought the crop factor was a characteristic of the lens. It is a characteristic of the camera body. For the sake education and understanding, I believed it should be cleared up.

Essentially we are all saying the same thing, but in a different language :)
 
Taylor Rudd said:
Essentially we are all saying the same thing, but in a different language :)
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So which one of us is more confusing? (I'm honestly curious.)

The point is that people who are familiar with APS-C cameras need to know that they don't have to worry about whether a lens "has a crop factor" or not (and to be technically precise, no lens "has" a crop factor). The only time that that is important is when they are considering switching to full frame sometime in the future. Lenses designed for APS-C cameras, although having the same effective FOV on a crop sensor, specifically project a smaller image circle than lenses designed for full frame. When mounted on a FF camera, the image will be heavily vignetted.
 
ydgmdlu said:
So which one of us is more confusing? (I'm honestly curious.)
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I think we're just bad news all around :grin: Things probably favor your side, as I took the photographer's approach on a video forum! (Comes from years of shooting FF, 1.3x and 1.6x bodies on the same sets of L glass)

ydgmdlu said:
The point is that people who are familiar with APS-C cameras need to know that they don't have to worry about whether a lens "has a crop factor" or not (and to be technically precise, no lens "has" a crop factor). The only time that that is important is when they are considering switching to full frame sometime in the future. Lenses designed for APS-C cameras, although having the same effective FOV on a crop sensor, specifically project a smaller image circle than lenses designed for full frame. When mounted on a FF camera, the image will be heavily vignetted.
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Yup. Time to pitch a sticky thread to the mods so none of this happens again :)
 
You know, this issue doesn't even appear anymore in the GH1 forums, and there was never a sticky made about it. (I remember that it used to be the #1 or #2 issue there.) I wonder how they got over it.
 
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