
This focus adjustment chart is a quick and simple tool for adjusting the focus of your lens.
The adjustment board can therefore be used to check the possible front and rear focus of the optics. Using the board is easy: It is placed on a table or tripod, and the more suitable of the two measuring scales is selected for the optics being tested at any given time.
You need a DSLR camera with focus micro-adjustment or a Sigma, Samyang or Tamron lens that works with the manufacturer's USB dock.