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Sony A7R
Novoflex adapter
Zeiss 21m f/2.8 Distagon

Pentax 645Z
Pentax 90mm f/2.8

Pentax 645Z: 50 vs 36 Megapixels (25mm / 21mm, Matched Size)

An image is the sum total of many factors. Medium format has certain pluses, such as generally higher per-pixel quality from larger light-gathering photosites, but sharpness per pixel is hugely dependent on the lens used (and shot discipline).

Here we study a simply question: can the Pentax 645Z + Pentax 25mm f/4 visibly outperform the Sony A7R with the Zeiss 21mm f/2.8 Distagon.

This is a reasonable question to ask given the about $13500 cost and about $4400 cost for the smaller format (body + lens for both plus adapter for the Zeiss). Not to mention the size and weight differential, lens versatility, speed of operation and EVF of the smaller format.

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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 100 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.
Variants Pentax645Z + 25/4 @ f/11, Sony A7R + Zeiss 21/2.8 @ f/8 available in full article

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