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What happens when you put an EF-S lens, via electronically communicating extension tubes, on an EF body? Is there any risk of screwing up the EF body's or the EF-S lens's electronics? I haven't tried the experiment of putting any EF-S lens on a FF body before now, mostly because without...

So, I would like to process images of cilia cross-sections (transmission electron microscopy black and white image), which have 9-fold symmetry, to enhance some hard to see structures. Easiest is probably to rotate the same cilium cross-section +40 degrees around the circle, thin the layers ...

and is it reliable on your OS (10.6.8 to 10.10.1)

So, I would like to be able to AF microadjust my 400 f/5.6L as well as shorter lenses. I am looking for advice on a method or product for this procedure. I would like to get a start on learning the method before buying the 7D2. I would like to distinguish between hardware problems (AFMA needed...

The lens is in at B and H and Adorama, and is listed in European sites. I am waiting for someone to do a coma test on the lens, as well as a general review (yoo-hoo, Lenstip!). This would be a great astrophotography lens for ultrawide applications such as meteors, auroras, etc. , also for...

Is anyone else excited at the Samyang 12mm f/2.8 full frame diagonal fisheye? Please Samyang, make this a good one, decent corners, no obnoxious coma, usable for astro-landscape and for meteor fields at f/2.8 to f/3.5

Has anyone seen or made a good rain umbrella holder for tripod? Bill Lea gave a seminar locally and had a prototype holder for a golf umbrella, looked nice, not available yet. The idea is to have a cup that one can attach to the tripod leg, umbrella sits loosely in the cup (you don't want to...

It's official. Yet one more amazing lens, no doubt with an even more amazing price tag.

Thoughts on this, lens owners out there? I have yet to get a normal zoom for my 6D due to dithering about "which one". I would like to have decent performance at minimum focus distance for a walkaround zoom. I hear such good things about the f/2.8 II, but have seen one review stating that...