Quote Originally Posted by neuroanatomist


Quote Originally Posted by EdN
When you can't get close enough without disturbing the critter, try using the 672 mm F/5.6 macro, i.e. 7D with 300 mm F4L IS and 1.4x.

Well, Ed - to be technically correct, if you're including the crop factor effect on focal length you need to include it on aperture as well, so what you have is a672 mm f/9lens in terms of FF equivalence.




The F/9 would be for depth of field purposes but it lets in light like an F/5.6 for increased shutter speed. For me, if I'm up that close, I'm looking for both speed to freeze the critter (and my hand movement) and depth of field to grab some extra detail. For the right situation, it can be a win-win.