Set the mode dial on your camera to Av (aperture priority) mode.
Set up dioptric correction.
Set your lens to “Manual” (M) with its manual/auto switch.
Set your lens to its widest aperture
Focus on a well-lit subject.
Since you often won’t have any aids on your mirror, like a microprism ring, to help you focus accurately, this can be awkward. It sometimes helps to keep turning the ring until you are in focus, turn it a little further till you’re out of focus, then very slowly turn it back. Once you’re in focus, stop your aperture down by a couple of stops; this will give you a greater depth of field to compensate for the inevitable focusing error, however small.
니콘 렌즈 (Nikon 300mm f/4) 캐논 EOS 어댑터
This telephoto lens bought in 1997.
M42 to EOS (M42 렌즈 캐논 EOS 어댑터)
I took two shots using Nikon ED AF NIKKOR 300mm 1:4.
I’ll definitely buy a tripod and study how to used manual telephoto lens.