Should extension tubes change exposure?
Posted: 20.12.2012 14:37
Have just started shooting diamond rings with my Canon 1DX and my EF 100 2.8, previously used my 50D. So far everything great however....
Because the 1DX is a full frame, I can't fill the frame with a ring now at the closest focus distance like I could with the 1.6 crop 50D.
So... I popped on my extension Kenko/Canon tube set totalling 66mm - much better, but when the stack finished I saw a big change in brightness from the first to the 40th shot - at least one maybe two stops ??? Repeated the stack - same thing -, removed the tubes back to normal.
I've been doing this for a few years now - first time using tubes - lighting is the same - studio flash and fills all on manual etc and camera settings all fixed of course.
Like to hear your thoughts.
Because the 1DX is a full frame, I can't fill the frame with a ring now at the closest focus distance like I could with the 1.6 crop 50D.
So... I popped on my extension Kenko/Canon tube set totalling 66mm - much better, but when the stack finished I saw a big change in brightness from the first to the 40th shot - at least one maybe two stops ??? Repeated the stack - same thing -, removed the tubes back to normal.
I've been doing this for a few years now - first time using tubes - lighting is the same - studio flash and fills all on manual etc and camera settings all fixed of course.
Like to hear your thoughts.