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Pentax 645Z
Pentax HD 35mm f/3.5 AL [IF]

Aperture Series: Pescadero Creek Upstream, Late Blue Dusk (645Z)

This outdoor near-to-far scene explores the consistency of sharpness and gains in depth of field for a real world outdoor landscape image. It was nearly dark, and the 645Z could not autofocus in these conditions; manual focus got the job done.

Depth of field expectations should thus be appropriate: in depth of field terms, as compared to a 35mm DSLSR, f/3.5 is equivalent to f/2.8, f/9 ~= f/7.2, f/11 ~= f/8.8. ; see Image/Sensor Size, and 645Z Focal Length and F-Stop Equivalence vs DSLR.

Pescadero Creek Upstream, Late Blue Dusk

Mirror lockup with 2 second self timer.
f-stop: 3.5, 5, 5.6, 9, 11
seconds: 10.0, 30.0, 30.0, 30.0, 91.0
push: +1.3, +0.2 +1.66, +2.66, +3.0 <== raw conversion in ACR

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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 3.5,5,6.3,9,11 available in full article

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