Bower 800mm f/8 Manual Focus Telephoto T-Mount Lens SLY8008

Product Highlights

• Mirror Lens
• Just 4.4" Wide & 5.2" Long
• Accepts 105mm or 30.5mm Filters
• Requires Camera-Specific T-Mount

The Bower 800mm f/8 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 or for nearly any film camera.  However, in every case the fixed f/8.0 aperture is not communicated to the camera body.  As such, you can use the camera in the "M" manual exposure mode or the "A" aperture-priority mode (if your camera is so equipped).

This lens, at 4.4 x 5.2" and just over 2 pounds, has a broad diameter and stocky build.  It is a bit easier to handle than a normal 800mm refractor lens, but it is still a super-telephoto in any case (you should use a tripod/monopod in any case for best results).  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 800mm f/8.0 mirror lens in T-mount

• Multicoated optics

• Distinct out-of-focus highlight characterization

• White lens barrel helps prevent heat retention

• Accepts small, less-costly 30.5mm filters upon rear of barrel (also

  accepts 105mm filters)

• Made in South Korea

Filter Size	105mm front, 30.5mm rear
f/Stop Range	f/8.0 (fixed)
Minimum Focus Distance	11.5' (3.5 m)
Magnification	Not Specified by Manufacturer
Angle of View	2.6° x 1.7° (WxH) 1.7° x 1.1° (WxH) w/ APS-C (15 x 22mm) cameras
Groups/Elements	8/8
Length	5.2" (132mm)
Maximum Diameter	4.4" (111mm)
Weight	2.08 lbs (946g)