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EXCERPT page containing first few paragraphs. 2022-08-19 06:51:52

60MP Sony A7R IV
Zeiss Loxia 25mm f/2.4 Distagon

Examples: White Mountains Bristlecones (Sony A7R IV)

This page shows various examples with bristlecone pines on the Sony A7R IV in the White Mountains of California. Some examples use focus stacking, some use frame averaging.

Includes images up to full camera resolution and some also have upscaled versions.

Backlit Bristlecones, Late Dusk

While shot with 14-bit files, the Sony A7R IV damaged quality here with its lossy compression format, resulting in block artifacts on the main tree trunk where the light shines through. Sony as of late 2019 still has not seen the light in offering lossless compressed raw. I should have shot uncompressed raw, but the doubling of storage and backup time is a penalty I do not want to incur for all files; I did not think of the potential risk in this case. It also looks to me like the A7R IV generated gradient issues in the sky, which is not quite uniform—something I saw in previous models.

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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.

Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.

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f8 @ 0.6 sec electronic shutter frame averaging 16, ISO 100; 2019-10-25 18:24:46
Sony A7R IV + Zeiss Loxia 25mm f/2.4 Distagon
ENV: BristleconeGraveyard, altitude 11500 ft / 3505 m, 45°F / 7°C
RAW: LACA corrected, vignetting corrected, push 2.4 stops, +100 Shadows, -100 Highlights, Luminance NR {20,,50,0}, Chroma NR {50,50,50}, USM {10,50,0}, SmartSharpen{60,1.0,0,0}, TopazSharpenAI {RemoveBlur=1.0 SuppressNoise=1.0 AddGrain=0}

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