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Categories: all aviation bicycle gadgets misc motorcycle theater Tue, 20 Jul 2010I got the lens onto the camera last night, and I'm honestly a bit confused about what I discovered. The best I can say is that the linearity of the focusing data seems questionable. With the full (+20 toward distance) adjustment dialed in, my 70mm at 1.5 feet test looked alright. Not ideal, but close enough. However, with that same adjustment dialed in, shots further away were dramatically back-focused (what you'd expect with this adjustment in place, and a correctly-functioning lens). With other tests, it looked like I was getting in focus consistently on the second shot, but not the first, and not by the huge difference I found in some other shots. I didn't have time to sit down and approach the problem systematically last night, but the answer I have right now is that I have no clue what's going on. I don't trust the lens to focus correctly. Once I get some rational test results that hit the situations I mostly find myself in, I'll have a clearer picture. I was too tired last night and fiddling with too many variables at once to have anything conclusive to say right now. More to come. I just need to approach the problem rationally and I should end up with a workable solution. Clearly the lens is getting close, and my messing with the AF adjustment in the camera was a lot of the confusion. Posted at 11:41 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. |