EXCERPT page containing first few paragraphs. 2024-05-20 06:36:01
UA_SEARCH_BOT_compatible_botmozilla/5.0 applewebkit/537.36 (khtml, like gecko; compatible; claudebot/1.0; +claudebot@anthropic.com) @ 3.128.171.246
For full access, subscribe here. Or click title to login. 
MTF for Hasselblad XCD 21mm f/4, INF and MOD
MTF is shown below at f/4 and f/8 for both infinity focus (INF) and minimum object distance (MOD). Diffraction is incorporated according to the datasheet, but whether it is measured or computed is not stated but appears to be calculated not measured eg likely fantasy MTF. Real lenses often fall short of calculated figures.
A pronounced dropoff in sharpness occurs from center to edges. Field shots show that this is due to a forward field curvature. This will not be an ideal lens for planar subjects at f/2.5 or even f/4 eg landscape, group photo, anything at a uniform distance across the frame. But the results will be reaasonably good over most of the frame.
Article continues for subscribers...
Diglloyd Medium Format is by yearly subscription. Subscribe now for about 33 cents a day ($120/year).
BEST DEAL: get full access to ALL 8 PUBLICATIONS for only about 75 cents a day!
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.
