A57 focus adjust and the rumored firmware update. Thinking big!

Started Jan 28, 2013 | Discussions thread
Chris Malcolm
Contributing MemberPosts: 815Gear list
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Re: A57 focus adjust and the rumored firmware update. Thinking big!
In reply to rpenmanparker, Jan 29, 2013

The Sony 50mm f/1.4 lens suffers from spherical aberration, as do all "nifty 50s" of its design generation. That means it will suffer from aperture related focus drift. That means a simple generic AF system as found in the cheaper DSLRs will always back focus with the lens wide open. AF is not perfect, & the cheaper AF systems in the cheaper DSLRs aren't as good as the more expensive ones. There will be some lenses at some apertures that you will have to manually focus. That's still true of the best DSLR AF systems, just less often.

 Chris Malcolm's gear list:Chris Malcolm's gear list
Sony Alpha DSLR-A550 Sony SLT-A77 Sony 50mm F1.4 Sony DT 18-250mm F3.5-6.3 Sony 500mm F8 Reflex +7 more
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