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The Opteka mirror lens is incredibly compact and lightweight. Using an advanced reflex design, this is a mirror lens that is ideally suited for wildlife and sports photography. It has a fixed aperture of f6.3. Opteka mirror lenses incorporates advanced computer designed optics and the latest in multi-coating techniques. The process of multi-coating assures virtually flare free photographs even under adverse lighting conditions resulting in crisp high contrast pictures with full color fidelity.
When combined with the T-mount to fit your camera system, this mirror lens mounts to camera and works on both "full frame" cameras as well as the "APS-C" style digital SLR cameras. T-Mounts are available for all the digital SLR systems, as well as for C-mount systems. As such, you can use the lens in "M" manual exposure mode or "A" aperture-priority mode only. This lens has a broad diameter and stocky build, making it a bit easier to handle than a normal refractor lens. It also has a much different rendering of out of focus areas than a normal lens; highlights will be doughnut-shaped rings with more saturation and contrast on the edge of the ring than on the center.
The included Opteka 2X Teleconverter effectively doubles your zoom converting this lens to a 500mm / 1000mm Super Telephoto!
Please note that this is a manual lens. You will need to set your camera to manual mode.
Lens Construction: 4 Elements in 4 Groups
Angle of View: 5 degrees diagonal
Filter Size: 67mm
Lens Hood: No
Aperture Range: 8.0, 11, 16, 22, 32
Minimum Focusing Distance: 33 ft / 10m
Length: 298 mm / 11.75 in.
Weight: 22.5 oz (640g)
Mount: T-Mount Required
Warranty: 5 Years.