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Categories: all aviation bicycle gadgets misc motorcycle theater Wed, 21 Jul 2010I sat down with a notepad and did some ordered and logical testing with my 24-70 last night. With no adjustment in the camera, the lens was focusing about right in most cases. This is good and bad. When I say "about right," that means that in something like 20% of cases, the focus was pretty unacceptably soft. When I dialed in +20 on the AF adjustment, the results were less predictable, with the focus sometimes right on (what?) and sometimes dramatically back-focused, like I expected. I didn't collect statistics last night, but I'll post a gallery of the focus shots later (I need to redo them with better light, to ensure that low light wasn't contributing to errors, although the lens has to shoot in low light in practice), and come up with some numbers. The bottom line is that right now I'm not comfortable with this lens's ability to focus correctly. This will probably end up with me renting that Canon 24-70 f/2.8L lens from Glazers again, to compare. The Canon L lens is pretty much the gold standard, so it'll be a good control result. Posted at 14:33 permanent link category: /misc Categories: all aviation gadgets misc motorcycle theater Written by Ian Johnston. Software is Blosxom. Questions? Please mail me at reaper at obairlann dot net. |