EXCERPT page containing first few paragraphs. 2024-05-09 21:42:15
UA_SEARCH_BOT_compatible_botmozilla/5.0 applewebkit/537.36 (khtml, like gecko; compatible; claudebot/1.0; +claudebot@anthropic.com) @ 3.141.31.209
For full access, subscribe here. Or click title to login. 
MTF for Hasselblad XCD 90mm f/2.5 V
MTF is shown below at f/2.5 and f/5.6.
Wide open at f/2.5, performance is very high, albeit with odd local dips of astigmatism and likely field curvature of modest degree.
Peformance rises into the corners at f/5.6 but overall is no better and even a little worse than at f/2.5. It is hard to say for sure what is going on since the 38/2.5 and 55/2.5 do not show this drop at f/5.6. It might be diffraction, but if so, then the 38mm and 55mm should show a similar drop.
Calculated MTF curves including diffraction. Not measured from real lenses. Sagittal slit orientation drawn with continuous line and tangential with dashed. White light. Spatial frequencies 10, 20 and 40 lp/mm.
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.
