Quote Originally Posted by Dave Throgmartin View Post
I came across one of Daniel Browning's posts on another forum and this is what he said:

100mm f/4 on APS-C has the same angle of view as 160mm f/6.4 on FF35.
100mm f/4 on APS-C has the same depth of field as 160mm f/6.4 on FF35.
100mm f/4 on APS-C has the same diffraction as 160mm f/6.4 on FF35.
100mm f/4 on APS-C has the same total amount of light as 160mm f/6.4 on FF35.
100mm f/4 on APS-C has the same noise as 160mm f/6.4 on FF35.
Hmmm? I was once slammed on here by one of the brainy folks that a statement I made about a 85 1.2 on a 7D would have similar FOV and similar DOF as 135 2.0 on a 5D. DOF was the contested part. I guess if another brainy guy says it with all the fancy numbers and lingo it's ok. Oh well.