EXCERPT page containing first few paragraphs. 2019-03-25 03:59:14
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The rear filter slot accepts 40.5mm filters. The lens ships with a 40.5mm clear filter, and a 40.5mm polarizer filter.
The Pentax 25/4 is a good lens, but one that leaves the sensor underserved, as the Sony A7R + Zeiss 21/2.8 Distagon comparison shows, as do the various aperture series that explore its performance. Stop down to f/8 at the least, with f/11 generally needed for acceptable results to the edges and corners.
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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.