Olympus E. Zuiko Auto-T 135mm f/2.8

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2 Responses

  1. Anonymous says:

    Thank you very much for your review of the Zuiko Auto-T 135mm f/2.8, and in particular for making accessible the ISO 12233 test images in full resolution. This has been very helpful for me.

    I’d like to add a few observations, if I may: I believe the ISO 12233 test chart is designed to let you read the resolution figure in lines widths per picture height directly from the chart, but this works only if the tips of the black triangles barely touch the image borders. The opposing white triangles inside the black borders of the chart must be outside the picture. If they are visible on the picture like they are on yours, then the numbers on the chart are not directly meaningful anymore.

    • Thank you for the comment. As you know ISO12333 is a help to test the entire system, not the lens alone. In other words, you can make the crop as large as you like and the only thing you need – is to relate your MTF figures to the resulting image size. For me, it is much easier to allign the camera this way, especially when I have to change many lenses. Resulting differences (after crop) should be minimal. I am permanently looking for more reliable system to allign my test charts, but so far it is rather mission impossible. This is why I usually advice, to judge my ISO test rather as a lens tendency, than in its absolute figures.

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