Bower 500mm f/6.3 Manual Focus Telephoto T-Mount Lens SLY50063

Product Highlights

• Mirror Lens
• Just 3.9" Wide & 4.7" Long
• Accepts 95mm or 34mm Filters
• Requires Camera-Specific T-Mount

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).

• Fixed-aperture 500mm f/6.3 mirror lens in T-mount

• Multicoated optics

• Distinct out-of-focus highlight characterization

• White lens barrel helps prevent heat retention

• Accepts inexpensive 34mm filters (upon the rear of the lens)

• Made in South Korea

Filter Size	95mm front, 34mm rear
f/Stop Range	f/6.3 (fixed)
Minimum Focus Distance	6.6' (2.0 m)
Magnification	Not Specified by Manufacturer
Angle of View	4.1° x 2.7° (WxH) 2.6° x 1.7° (WxH) w/ APS-C (15 x 22mm) cameras
Groups/Elements	6/7
Length	4.7" (120mm)
Maximum Diameter	3.9" (98mm)
Weight	1.55 lbs (705g)