Originally Posted by
Drew Bedo
BTW: the correct spelling is "Circo-Miro-tach" I think. These things were designed for use in 35mm photography and advertised showing "sneaky" sideways shooting at the beach.
I don't think it degrades the image. It seems to be a front-surface mirror. I used step-up or step-down rings to adapt it to my lenses. My 210mm seemed to work bst. I haven't looked on e-Bay lately, but my recollection is that it was not expensive.
It is a little fiddley to use, as every time you adjust focus, the framing will change. Front movements are problematic as well.
There are other right angle mirror attachments out there, so look around and see what you like.