

Lens Chromatic Aberration in IR Versus Visible Light
Comparing a lens lateral chromatic aberration in visible versus infrared light using the MTFMapper program.
Ed Dozier
Jan 2


Lens Longitudinal Chromatic Aberration in Infrared
Analysis of a lens for longitudinal chromatic aberration in both infrared and the visible spectrum. The same lens can perform great or horribly, depending upon the light wavelengths being measured.
Ed Dozier
Dec 19, 2025


Fast Portrait Editing using the ON1 Editor
How to use the ON1 editor to make professional-looking portraits with maximum speed and ease. Its artificial intelligence is very good.
Ed Dozier
Dec 5, 2025


Topaz Photo Studio Sharpening Algorithms Compared
Comparing all of the sharpening algorithms in Topaz Photo Studio (and Photo AI), concentrating on the eyes in a portrait.
Ed Dozier
Nov 21, 2025


Measure and Compensate for Lens Spherical Aberration
An explanation of the lens defect called 'spherical aberration' and how some cameras can automatically compensate for it.
Ed Dozier
Nov 7, 2025


Using Topaz Photo Studio to Remove Unwanted Objects
Tutorial on using Topaz Photo Studio to remove objects from photos. Their artificial intelligence is quite amazing.
Ed Dozier
Oct 24, 2025


Starscapes using Topaz Photo Studio and Capture One
How to use the Topaz Photo Studio and Capture One editors to create amazing starscapes.
Ed Dozier
Oct 10, 2025


Diffraction-Limited Lenses and the Sharpest Possible Photo
An explanation of how physics itself limits just how sharp a lens can be. Some things even money can't buy.
Ed Dozier
Sep 26, 2025


Nikon Z8 400% Zoom Manual Focus vs. Autofocus Accuracy
Comparing the Nikon Z8 autofocus accuracy against its new 400% zoom manual focus. Getting the absolute best focus.
Ed Dozier
Sep 12, 2025


Should You Use A Tele-converter or Not?
How to decide when using a teleconverter on your camera lens is worth it. There are many things to consider in this decision.
Ed Dozier
Sep 4, 2025



















