Latest or all posts or last 15, 30, 90 or 180 days.
Welcome to
In-depth review coverage is by subscription.
Also by Lloyd: and
First-time visitor
Capacities up to 48TB and speeds up to 1527MB/s

Nikon D5: File Size as a Metric for ISO Quality

Get Nikon D5 at B&H Photo.

When shooting in lossless-compressed raw (NEF), the file size is a directly-correlated metric of image detail, which includes noise (randomness). That is, information theory of entropy says that more randomness (more noise and/or more detail) is less compressible.

Thus, when taking dark frames, compressed file size is a direct metric for the ISO range at which noise increases to more problematic levels. One needs no fancy analysis: just look at file sizes for an accurate study of the ISO values which are likely to be troublesome relative to lower ISO values. This of course does not address pattern noise or other problematic behaviors, just noise overall.

Nikon D5: File Size as a Metric for ISO Quality

This study is an interesting confirmation of the conclusions in the Nikon D5 ISO series, based on NEF file size alone!

Dark frames shot at 1/8000 @ f/16 with the rear viewfinder blocked, lens cap on and camera covered—no light whatsoever. All frames shot in lossless-compressed 14-bit NEF.

Best Deals, Updated Weekly
View BEST Deals Right Now
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 92 min unless noted. Certain deals may last longer.
$1049 SAVE $450 = 30.0% $20 FREE ITEMS Canon EOS 77D DSLR with 18-135mm USM in Cameras: DSLR
$599 SAVE $100 = 14.0% GoPro Fusion in Video: Camcorders
$1697 SAVE $300 = 15.0% Nikon D750 DSLR in Cameras: DSLR
$2197 SAVE $900 = 29.0% Nikon D750 DSLR with 24-120mm in Cameras: DSLR
$3297 SAVE $800 = 19.0% Nikon D810 DSLR with 24-120mm in Cameras: DSLR
$1399 SAVE $100 = 6.0% ZEISS 18mm f/2.8 Batis in Lenses: Mirrorless
$1099 SAVE $200 = 15.0% ZEISS 25mm f/2 Batis in Lenses: Mirrorless
$1299 SAVE $200 = 13.0% ZEISS 21mm f/2.8 Loxia in Lenses: Mirrorless
$1999 SAVE $300 = 13.0% ZEISS 18mm f/2.8 Milvus ZF.2 in Lenses: DSLR

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2008-2017 diglloyd Inc, all rights reserved.