Do EF-S lenses have the same perspective as EF?

I know that my 350D has 1.6 crop factor, but when using EF-S lenses

does it have the same perspective as a EF x 1.6.

 

People say a good portrait lens is from 80mm - 200mm, so I've heard.

But sticking, say 50mm - 125mm lense on my 350D will give me a

zoom/crop factor of 1.6 so it will be equivalent to 80mm - 200mm, in

terms of image size only and NOT perspective.

 

I was wondering if EF-S lenses are the same, or due to their

different construction they will give a different perspective.

Yes. 17mm on a 17-40 has the same focal length, view angle and thus perspective as the 17-85 IS (for example). The difference between the two is that the 17-40 is designed to make an imaging circle for a 35mm frame, whereas the 17-85 only makes an APS-C sized image circle.

Perspective is determined solely by the distance between you and the subject. No lens has a perspective or an influence on perspective.

What Jeff said.

 

That being said, on a given camera, to achieve a given magnification relative to the frame size, all lenses with the same focal length will require the same focusing distance.

Thanks for replies. That answers it.

 

I have seen people, on deciding which is a good portrait lens to get, factor in 1.6 crop. If you choose a 100mm lens to flatten the image, why should the crop factor matter? You are choosing the portrait lens for its perspective are you not?

The field of view is the same for a given focal length (on a given camera) regardless if the

lens is EF or EF-S. However, a given focal length will have a narrower field of view on an APS

format camera (1.6 "crop factor") than on a full-frame camera. As Jeff says, perspective is

independent of focal length -- it's just a function of subject distance.

You don't seem to be getting it. There is no influence of the lens on perspective. Where you plant your feet (or your camera) relative to the subject determines perspective.

Camera position controls perspective.

 

Focal length controls magnification.

 

Format controls field of view at that magnification.

 

(Courtesy Rick Denney, I think)

Jeff is correct. However, with a 50mm lens, assuming the same framing, you will need to back up to get the subject in the frame. Backing up compresses the perspective. Hence a 50mm lens compresses the perspective, if you want to see it that way, the same as an 80mm lens on a full frame camera. It has nothing to do with optics and everything to do with where you put your feat. However, using a smaller chip makes you move your feet back the same as using a longer lens does.

Jeff is correct indeed, at least technically.

 

However, most people think about framing as the primary parameter, with camera position being secondary. Think of how many people think that "zooming in" allows to "get closer" (you don't move while zooming, and using a longer focal length, if anything, allows to be further away for a given framing).

This link provides some good background on the subject.

 

 

http://www.phototakers.com/forum/ftopic36480.html

<p>Hi,

 

<p>Your question's been answered, but I'm not sure that it's been answered clearly, and this is shown by your response:

 

<p><quote>"I have seen people, on deciding which is a good portrait lens to get, *factor in 1.6 crop. If you choose a 100mm lens to flatten the image, why should the crop factor matter? You are choosing the portrait lens for its perspective are you not?"</quote>

 

<p>You haven't understood. To answer your question:

 

<p>

<ol>

<li> Perspective is determined by subject distance, not the lens used.

<li> An 80mm lens is typically used in 35mm portrait photography since the subject/camera distance for head-shot framing that the 80mm imposes creates a pleasing amount of perspective (features aren't disorted yet they're not too compressed either)

<li> To retain this same distance, and thus perspective, with a 1.6 crop factor, you'll need to use a 50mm lens.

</ol>

 

<p>Tim

Thanks for all the extended answers. They help alot in explaining the principle behind it.