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Defective Oly 25mm lens

Started Mar 16, 2016 | Discussions
CrisPhoto
CrisPhoto Senior Member • Posts: 1,749
Re: Additional image

addlightness wrote:

The 'right' way to test a de-centered lens is to shoot a flat scene like a piece of printed paper. And you've a controlled environment which should be invariant to aperture values. In theory, you should be able to test it from f1.8 to f22.

Your point about shooting landscape is valid in everyday use cases but not for testing de-centering. What conclusion can you draw if a shot looks perfect at f22 but not at f8, say?

Edit: the new pic with the 25mm looks fine to me(left hand is not any blur-er than right) and much better than the zoom. IMO.

The OP is not talking about a macro lens, he is complaining about some kind of landscape scene!

His test setup is simple and completely valid. At f4 and 50m distance, everything from 8meters to infinity is in focus. And indeed, it is in focus on the right side of his photo. But the left side if his shot is not sharp at any distance. For me, this lens is a lemon ...

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Martian Flatcat
Martian Flatcat Regular Member • Posts: 457
Re: Additional image

Just for interest's sake, I took shots of Bob Atkin's chart (Here ) upright and inverted, and I see left-hand softness in my copy of the 25mm as well.

The Sigma 30mm 1.4 just went to the top of my lens list. 

Meanwhile, I shall have to persevere. 

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--Flatcat

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