Darn good article -- â€œHow to test a lensâ€ by Roger Cicala !
The touch-and-feel tests are exactly what I needed to know and review before I picked up some used lenses. Thankfully I got lucky in spite of my lack of knowledge, but I'll be far better prepared to buy used and news lenses from now on.
Thank you Roger.
Yes +1 for Roger. I recently bought a LensAlign MkII and was disappointed in lack of instruction manual, although their website has an article describing how to use other models like the LenAlign Pro and the LensAlign Lite. Roger's article helped fill some of the gap related to focus testing using LensAlign technique - in addition to other valuable tips. Very good article!