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The Bower 500mm f/6.3 Manual Focus Lens is a catadioptric mirror T-mount lens, precision manufactured in South Korea.
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. However, in every case the fixed f/6.3 aperture is not communicated to the camera body. 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.
This lens is an ideal candidate for astrophotography use when mounted to a Vixen GP2 Photo Guider (or other motorized equatorial telescope mount).
|Camera Mount Type||T-Mount (T-Thread)|
|Format Compatibility||35mm Film / Full-Frame Digital Sensor
DSLR (APS-C Sensor)
|Angle of View||5°|
|Minimum Focus Distance||6.1'; (1.86 m)|
|Magnification||Not specified by manufacturer|
|Maximum Reproduction Ratio||Not specified by manufacturer|
|Elements/Groups||7 / 6|
|Diaphragm Blades||Not specified by manufacturer|
|Filter Thread||Front: 95 mm
Rear: 34 mm
|Dimensions (DxL)||Approx. 3.86 x 4.69" (98 x 119 mm)|
|Weight||1.43 lbs (650 g)|
|Package Weight||1.85 lb|
|Box Dimensions (LxWxH)||7.0 x 4.8 x 4.7"|