Lens compression on crop sensors

[sambloxxy]

Hi all,

This has bugged me for a while and I've never found a good answer to it.

Does the compression of a given focal length of a lens change on a crop sensor slr?

For example, does 200mm on a 1.6 crop camera show the same compression as it would on a full frame, or would it be the equivalent compression of 320mm?

I understand that it as it doesnt change, because the glass is the same, but im not sure...

 

[scottthehat]

If you have a 200mm lens on a 1.6 crop camera like your 7d it will give you a feild of view of 320mm on a 35mm camera (full frame) so to stand in the same place with a 1.6crop camera and full frame and get the same shot you would need a

7d (1.6 crop) with a 200mm lens and
a 5dmk11 with a 320mm lens on.

 

[gad-westy]

Interesting discussion on this very same subject yesterday.

http://www.talkphotography.co.uk/forums/showthread.php?t=446239

 

[sambloxxy]

Thanks for the thread. Think I'll move my questions over to there!

 

[Andy_S]

When using the same focal length, the image from a crop frame camera will be the same as a image taken on a full frame camera that has been cut/cropped down to size.
As Scott said, it's the angle/field of view that changes.