In article , Eric Stevens
wrote:

I know the general reputation and problems of mirror lenses. I also
know some brands are more highly (less lowly?) regarded than others. I
was wondering where the Bower lens stood in the pecking order.

the cheap ones are mostly the same and not particularly good. bower
more than likely does little more than put its logo on it.

the expensive ones are reasonably good, with the usual limitations of
mirror lenses.