At the price I thought this would be really useful, but I was wrong. It suffers badly from haze and flare so the photos are only any use with the sun behind your shoulder. I have a 300mm lens already and the pictures from this lens are more unsharp than just cropping the 300. Ill be reselling it soon
Pixco Detachable 3-bit Exakta Lens To M42 Screw Mount Adapter Ring
05 sep 2017
Adapter ring for exakta
The screws were very difficult to find an alan key for. When i did sort it the ring could not be tightened on my biotar 58mm. I think this ring has limited compatibility
CANON 500mm F8 REFLEX LENS FOR CANON FD MOUNT
11 oct 2017
Super lens
This is the best mirror I have used. 100% recommended as long as f8 is usable