This ultra-telephoto is incredibly compact and lightweight. Using an advanced reflex design, Samyang has created a mirror lens that is ideally suited for wildlife and sports photography. It has a fixed aperture of f8. It comes complete with a soft pouch and three (3) rear mounted, 30.5mm filters, (ND-2X, ND-4X & Skylight). Simple T-mount adapters screw on the lens to fit almost any camera.
Reviewed by 1 customers
I have used this lens for macro photography, wildlife shots and some astrophotography and if you are comfortable with manual focusing you'll love this lens. Lens does have some creep at steeper angles, but not much at less severe angles. A tripod is helpful for sharper focus at slower shutter speeds. I wish it could have an adjustable aperture, but as this lens is essentially a small catadioptric spotting scope, that's not in the cards. All in all I'm glad I invested in this product...it's portable and highly useful for my needs.