Newest version achromatic refractor 500mm f/8 lens in T-mount, compatible with APS-C and Full Frame cameras alike. With the Opteka 2x converter you can double the focal length to 1000mm
QUICK SPECS - aperture f/8 - f/16, minimum focus distance 33 feet, angle of view 5°, filter size 67mm, telephoto 500 to 1000mm, weight 28 oz
OPTICS - High index, low dispersion multi coated High Definition Glass Optics in four groups and four elements to reduce flare and ghosting
CONSTRUCTION - An all metal yet light weight body ensures a rugged, durable and rigid product for both indoor and outdoor use
PRACTICALITY - Built-in tripod collar for improved lens balance and knurled focus ring to the front of the lens to improve grip in less than ideal weather. A protective lens pouch is also included