I wanted to try an inexpensive mirror lens with a 2x extender for nature photography. It’s not bad, but not great either. The acuity is not as good as I’d like, and the depth of focus is paper thin. But when it works it’s pretty good.
These seagulls were hunting shad on the far side of the lake, about 700 meters away.
The flat field of focus can be really nice. I like this back-lit grass and weeds.
all photographs (c) 2015 Robert W. Harrison