EXCERPT page containing first few paragraphs. 2019-03-24 21:34:49
UA_SEARCH_BOT_null @ 220.127.116.11
Very long exposures have traditionally been difficult for medium format cameras, so how does the 645Z perform?
1922 seconds (32 minutes)
Adobe Camera Raw 8.6 (250): ACR settings.
This 1922 seconds exposure (32 minutes) used a 6-stop neutral density filter which tends to deliver yellowish color; the color balance has been seasoned to taste. The image has been pushed by +0.4 stops on top of that very long exposure!
As the RawDigger histogram shows, the blue channel was somewhat underexposed, and the image could have accepted another 1/3 stop or so (see the green channel histogram). The warm light and warm filtration led to the blue-channel underexposure, and this does lead to some shadow noise, but it’s very hard to spot unless one converts into sRGB or AdobeRGB—not a great idea—see Wide Gamut Colorspace Reduces Noise, Avoids Posterization). The noise is almost invisible in ProPhotoRGB.
Article continues for subscribers...
Diglloyd Medium Format is by yearly subscription. Subscribe now for about 27 cents a day ($100/year).
BEST DEAL: get full access to ALL 7 PUBLICATIONS for only 68 cents a day ($249.95)!
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.