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EXCERPT page containing first few paragraphs. 2022-08-18 15:30:30

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

Aperture Series: Dolls, Close Range (645Z)

The Pentax HD 35mm f/3.5 AL [IF]offers a close focus capability down to 1:4 which means that for its 43.8mm X 32.8mm sensor it can capture an image field of width 175.2mm.

This scene as captured is ~380mm wide, hence the reproduction ratio is about 1:8.6 at a subject to front lens element distance of ~12 inches, ~14 inches from subject to sensor plane.

Depth of field expectations should be appropriate: in depth of field terms, a 35mm DSLSR at f/13 ~= f/10.6 for the 645Z. See Image/Sensor Size, and 645Z Focal Length and F-Stop Equivalence vs DSLR.


Mirror lockup with 2 second self timer.
f-stop: 3.5, 5.6, 9, 13, 16
seconds: 0.3, 0.8, 2.0, 4.0, 6.0 ... with ~0.45 stop pull

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Aperture series 3.5,5.6,9,13,16 available in full article

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