EXCERPT page containing first few paragraphs. 2024-04-16 02:48:59
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Examples: Bad Lens Sample (A7R II)
All images shot using a brand-new 42-megapixel Sony A7R II on tripod. Image stabilization disabled. 2 second self timer, EFC shutter.
This page documents a “bad sample” of the Sony 90mm f/2.8 Macro G OSS. The lens was delivered by B&H Photo in thick bubble pack in a box that was pristine, showing no signs of mishandling or impact. It was brand new as of the day these images were shot.
It is clear that the optical design of the Sony 90mm f/2.8 Macro G OSS is strong*, but a lens has to be built to tight tolerances to perform (this is part of what makes Zeiss Otus so strong—stringent quality control).
The loss of sharpness shown here is could be called an “f/8 error”, meaning that even f/8 cannot quite hide the loss of sharpness. But it’s more than sharpness; the effect is of smearing/tearing, an unsettled look to the image that has a reluctance to sharpen up with stopping down. If it were a flange-to-mount issue, one would see a skew in the plane of focus and not much more than that.
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Diglloyd Guide to Mirrorless is by yearly subscription. Subscribe now for about 25 cents a day ($90/year).
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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.
Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.
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- Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
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