Bower 500mm f/8.0 Manual Focus Telephoto T-Mount Lens SLY5008

Product Highlights

• Mirror Lens
• Just 3.0" Wide & 3.5" Long
• Accepts 30.5mm Filters
• Requires Camera-Specific T-Mount

The Bower 500mm f/8.0 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/8 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.

Despite this lens' long 500mm focal length, it has a compact 3 x 3.5" size and weighs under 1 pound, making it a bit easier to handle than normal 500mm refractor lenses (it should be used with a tripod or monopod in any case).  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/8 mirror lens in T-mount

• Multicoated optics

• Distinct out-of-focus highlight characterization

• Excellent close focusing capacity

• Accepts 30.5mm filters at rear of lens barrel

• Made in South Korea

Filter Size	30.5mm (rear)
f/Stop Range	f/8.0 (fixed)
Minimum Focus Distance	5.6' (1.7 m)
Magnification	1:2.7
Angle of View	4.1° x 2.7° (WxH) 2.7° x 1.8° (WxH) w/ APS-C (15 x 22mm) cameras
Groups/Elements	6/7
Length	3.5" (88mm)
Maximum Diameter	3.0" (77mm)
Weight	0.70 lb (320g)