Comments about Pro Optic Pro-Optic 500mm f/6.3 Mirror Lens for Canon EOS Mount SLR Cameras:

I bought this lens under speculation because of some reviews that deemed the lens somewhat substandard. I feel if you set your dioptic on your camera with a quality auto-focus lens while pointing it at a calender let's say, then attach this lens along with proper shutter speed, ISO, and a steady hand or tripod you will achieve all that you desire from this manual unit.
It's like a mini cassegrain telescope attached to your camera. It is an excellent quality and precision achievement. I find no fault with it.
It is the same size as my Canon, it is heavy but the unit itself aids the hand in steadying the shot. I have several lenses to compare this one to, and when I bring up the details with the magnifier, I find the focus level is quite good.
Comparable to my other lenses.
In short--You just have to know how to take pictures and you will have no gripes!

Comments about Pro Optic Pro-Optic 500mm f/6.3 Mirror Lens for Canon EOS Mount SLR Cameras:

The image is soft at 100% crop, but overall has loads of potential. The look reminds me of a high iso film, a touch of glow with what I'd actually call "grain" to it, not noise. I dont think it has any use in motorsports/action per say (wont know till I try) but for everything else I shoot I like it. Time will tell the whole story, but for [$]you cant go wrong. I really like the way this lense and black and white work. I seem to think it likes being a touch under exposed (1/3 stop) and if you can up the sharpness in your camera a notch it helps. It may not be my first choice in lenses to grab, but it has a place in my bag for sure.FWIW Im shooting it on a Canon Rebel XT with my iso at 100 most of the time.