Limitations of m43 in bright light. OMD and Leica 25mm f1.4

Started Apr 14, 2013 | Discussions thread
Anders W
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Re: Limitations of m43 in bright light. OMD and Leica 25mm f1.4
In reply to Mark Chan, Apr 15, 2013

Mark Chan wrote:

Went to Hong Kong Disneyland yesterday.

Facing the sun around 2:45pm insisted on using larger aperture (against gut feeling)to try and get some background blurring, so used anywhere between f2.0 - 2.8 whilst attempting to keep shutter speed within 1/4000.

Result was lots of CA making pics generally unsharp...I really appreciate the FF in this situ. Need to use zoom and distance with m43 to make up for this somewhat.

What kind of CA (lateral or longitudinal, and if the latter in the in-focus or the out-of-focus area)? Note that CA won't necessarily make an image unsharp once properly corrected in PP (although LoCA in the in-focus area will detract slightly from resolution) and that it does not vary with the brightness of the scene or the exposure. It may become more visible in high-contrast scenes however. Could you post some examples so that we could have a look at what you are talking about?

As a bonus can confirm that my copy of the Leica definitely has af issues. Af somehow extends away from the af box with ONLY this lens. I don't experience this with any of my other 6/7 lens.

What exactly do you mean when you say that "AF somehow extends away from the AF box with ONLY this lens" and how have you tested that? It would surprise me very much if the actual area used for the AF process would differ between lenses even though the box used is exactly the same.

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