The following article is a guest post by Dwight Duckstein.
I purchased a used Nikkor 70-200mm, 2.8f lens – the old style that didn’t have a tripod ring. Not wanting to spend even more money on an aftermarket ring that would interfere with the A ring, I decided to make my own. Granted, the materials cost me some change, but it is designed the way I want it, and it works. Your dimensions may vary, depending on which lens and which camera you mount it to, so I am not providing much dimension detail here.