Widely Regarded: Nikkor 20mm f/4 AI

The Nikkor 20mm f/4 AI (and its very close predecessor the K) was the optical successor to the very well regarded Nikkor 20mm f/3.5 Auto. The K was produced from 1974 to 1977 and the AI released for a short period til the start of 1978, at which point the Nikkor 20mm f/3.5 AI had been released. Both the f/4 AI and f/3.5 AI had good reputations but how are they really?

Precision Macro: Using the Nikon D300 with LiveView and Focus Peaking on Linux

Macro photography is a game of millimeters. When you are shooting at 1:1 magnification, the depth of field is so thin that even the slightest movement or a poorly calibrated viewfinder can ruin a shot.

The Nikon D300, while a solid workhorse even more than a decade and a half later, lacks the modern "Focus Peaking" found in mirrorless cameras. However, with a Linux machine, some open-source tools, and a custom Python script, we can give legacy liveview enabled DSLR real-time focus assistance.