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Which of these two lenses with a DX body .... ??

I

igmolinav

macrumors 65816
Original poster
Aug 15, 2005
1,126
4
Hi,

If you had a two cameras, a DX and a FX body, a ¨natural choice¨
to cover your range from 28 mm. to 50 mm. (Not important how
much longer the focal length is) could be this lens:

http://www.bhphotovideo.com/c/search?Ntt=canon+17-55mm&N=0&InitialSearch=yes

The 17 to 55 mm. f-2.8 covers that range.

However this lens, also covers the range from 28 mm. to 50 mm.
when placed on the DX camera, and can also be used as a
wide angle zoom on the FX body:

http://www.bhphotovideo.com/c/search?Ntt=canon+16-35&N=0&InitialSearch=yes

However, how much distorsion is there when using this lens on
the DX body, knowing this lens is made for FX cameras ?? How
much distorsion is there when using this lens at 31 mm., (31 mm.
multiplied by a 1.6 crop factor equals to 49.6 mm. on the DX
body) ?? How strong is the distorsion, or do images really looks
as if they had been taken with a normal lens ??

Thank you, kind regards,

igmolinav
 
Hi,

Nikon may have a similar lenses to Canon that you may want to discuss on! I don´t want to limit this thread only to Canon users, when Nikon users may have something to say : ) !!!

Kind regards,

igmolinav
 
every lens at 30mm will "look" like a 30mm lens on the same camera. perspective distortion is a myth, the only distortion is from lens design, most commonly barrel or pincushion.

you should choose based on how important that range is to you and which camera format you use more.
 
Hi Toxic,

Thank you for your answer : ) !!!

So, images of any of these two lenses at 30 mm.
on a DX body will look the same, and the pers-
pective distortion, if any, will be the same with
both lenses. Am I correct ??

Kind regards,

igmolinav
 
igmolinav said:
However, how much distorsion is there when using this lens on
the DX body, knowing this lens is made for FX cameras ??
Click to expand...

A DX camera simply uses a smaller portion of the len's image circle, so any lens issues will be limited to the same area if an image was taken with an FX body- since the center of a lens tends to be the sweet spot (there are a few exceptions) you'll see sharp, bright and relatively undistorted images on DX just like you would in the middle of an FX image. Nothing about the lens's project changes going from FX to DX, only the amount of the image circle used.

Paul
 
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