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Pentax 645Z
Pentax HD DA 28-45mm f/4.5 ED AW SR

Aperture Series @ 28mm: Pescadero Creek Upstream, Late Blue Dusk (645Z)

This outdoor far-field scene explores sharpness near to far and across the frame at 28mm (equivalent to ~23mm field of view on a 35mm full-frame DSLR).

This wide a field of view typically requires some lens tradeoffs, a “balancing” of various competing image quality interests. And that indeed is what is found.

This finely detailed image cries out for viewing on the iMac 5K (or at least a 4K display) so as to render the fine details of twigs and bark and moss in a far more compelling way than a standard display.

Riparian Forest

Mirror lockup with 2 second self timer.
f-stop: 4.5, 5.6, 8, 11, 16
seconds: 1.0, 1.3, 2.5, 5.0, 10.0

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Diglloyd Medium Format is by yearly subscription. Subscribe now for about 27 cents a day ($100/year).
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Diglloyd Medium Format covers medium format camera systems, including the Hasselblad X1D and Fujifilm GFX.

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.
  • How to configure menus and buttons and best operating practices, gotchas and how-to.
  • Real world examples with insights found nowhere else. Make sharper images just by understanding lens and camera behaviors.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to 28 megapixels filling up to 5K display, plus large crops.
  • 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 4.5,5.6,8,11,16 available in full article

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