EXCERPT page containing first few paragraphs. 2024-04-19 22:55:09
UA_SEARCH_BOT_compatible_botmozilla/5.0 applewebkit/537.36 (khtml, like gecko; compatible; claudebot/1.0; +claudebot@anthropic.com) @ 3.145.74.54
For full access, subscribe here. Or click title to login. 
Fujifilm GFX100: Unstable Lens Focus
Last tested with firmware 1.01 for the GFX100 and firmware 1.1 for the lenses (August 2019).
This discussion also applies to the Fujifilm GFX-50R and Fujifilm GFX-50S. Being an apparent electromechanical glitch, this discussion applies to all Fujifilm GF lenses and cameras as of July 2019.
As used here unstable lens focus means any non-optical behavior that changes focus position when nothing should have changed. Thus it excludes optical focus shift.
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.