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500mm BOWER Telephoto Lens Kit for Pentax dSLR Models ist, istDL, K10D, K100D, K20D, K200D, K-x, K-r, K-5, K-7
The Bower 500mm f/8 Manual Focus Lens is a classic refractor-style T-mount lens, with an aperture diaphragm in the middle of the lens body to stop down the aperture when necessary. However, it is assumed that much of the shooting with such a lens will be at its maximum f/8.0 aperture, with a tripod, monopod, or other such support. When combined with the T-mount to fit your camera system, this super telephoto works on both full frame cameras as well as the APS-C

Price is $124.00
Price: $123.95