EXCERPT page containing first few paragraphs. 2019-03-24 15:18:54
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This page shows how the Pentax-A 75mm f/2.8 performs.
The Pentax-A 75/2.8 is a manual focus lens, and I bought my copy in Ex+ condition from KEH.com for $159— quite a bargain, especially as it seems to outperform the $1200 (new) 55mm f/2.8 over the frame. There are autofocus versions of the 75mm out there as well, but I have not tested the AF version.
The Pentax 645D viewfinder is not symmetric, and thus it’s hard to know left/right framing precisely using the viewfinder. I did my best to frame it evenly, but it’s not quite centered. It is within 0.5° of level.
Contrast was added to counteract the relatively low image contrast (difficult lighting with some veiling flare especially at top).
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These systems are hugely expensive, so make the right choice for your own needs (full frame vs medium format).
- In-depth lens evaluations covering behaviors not likely to be found anywhere else, based on real-world field shooting.
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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.