QUICK SPECS - Push/Pull Zoom, Manual Focus, Minimum Focus Distance: 5.25' (1.6 m), Aperture f/8.3-16, Filter Size 62mm, 4 Elements in 2 groups Multi-coated Glass Optics, Rotating Tripod Mount
Newest version achromatic 420-800mm f/8 lens in T-mount, compatible with APS-C and Full Frame cameras alike. With the optional Opteka 2x converter you can double the focal length to 840-1600mm
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.