Back Focus

“Back focus,” in photography, originally meant what happens when a camera’s focus point is behind the film plane, resulting in soft, out-of-focus images.  This usually results from a misaligned lens element or ground glass; the image appears to be in focus when looking through the camera, but on the film, the image is blurry.

The term has morphed in recent years to mean an autofocus error, wherein the camera’s autofocus system latches onto something besides the subject, usually behind the subject.  Since autofocus systems rely on contrast to judge sharpness, back focus most commonly occurs when the background is much busier, brighter, or more contrasty than the subject, making it easier for the matrix to compute focus.

Both definitions are valid.

In this section, I will explore many different technical, artistic, and historic facets of photography and my camera collection.  Please feel free to explore, but be warned that this will eventually be a very deep rabbit hole.

Click on an image link below to explore.

Test Strips

Experimentation and research in digital and film photography, darkroom, scanning, and other subjects.


A lot of mythbusting, discussion of techniques, software, and other aspects of photography.

On The Bench

Repair, servicing, restoration, and other information.

The Collection

Spotlights on some of my favorite cameras & camera systems.