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Pentax 645D

Aperture Series: Pentax-A 75mm f/2.8 (Mosaic)

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.

Test scene

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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Diglloyd Medium Format covers medium format camera systems, including the Hasselblad X1D and Fujifilm GFX.

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  • 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.
Aperture series 2.8, 4, 5.6, 8 available in full article

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