diglloyd
The Speed You Need
The Speed You Need
SSDHard drivesMemory
Mac Performance Guide
Zeiss Lenses
Zeiss Lenses
Our trusted photo rental store
Our trusted photo rental store

File Size as a Measure of Optical Performance

File sizes across aperture for Nikon D800 + Zeiss 100/2 Makro-Planar
File sizes across aperture for
D800 + Zeiss 100/2 Makro-Planar

RAW file size (lossless-compressed variants) for the same scene across apertures is an excellent measure of the total detail recorded, which includes the effects of depth of field, diffraction, and lens performance.

With a planar scene (which eliminates depth of field as a variable), file sizes can tell you exactly where peak lens performance is reached in terms of recorded detail.

For the example at right, the scene is not strictly planar; there is some foreground and some background and the camera is tilted up slightly. Still, it’s mostly planar.

Observe that the peak file size is reached at ƒ/4, indicating that the maximum amount of detail is being recorded.

Aperture ƒ/5.6 maintains this file size, but diffraction begins to soften detail at ƒ/8, which thus drops the file size.

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2008-2015 diglloyd Inc, all rights reserved.