why micro focus adjustment ?

Started Feb 25, 2013 | Questions thread
Chris Malcolm Senior Member • Posts: 1,842
Re: You asked, I believe...

Chimere wrote:

I would expect that WA lenses may have a larger distortion of the focal plane.

Your response is quite disturbing. That means that practically all the Alfas without MA are at risk of noticable lower optical performance, when certain lenses are used, without calibration ?


You're right. It's not a specifically Sony Alpha AF problem, it's simply that AF is inherently subject to calibration problems, plus some lenses have focus planes & behaviour that make a simple definition of  "correct focus" impossible.

The higher end Alphas tend to have more sophisticated better performing AF. They also tend to have more sophisticated manual focus aids. MA helps AF to get better focus, but it can't solve all the AF problems, especially for zoom lenses.

If you want the sharpest possible images then you must learn when you can trust AF & when you can't. Individual cameras & lenses vary enough that you must do this by experiment for your camera & your lenses. Sony Alphas are rather good at giving you facilities to make this easier.

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Chris Malcolm

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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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