Bower 650-1300mm f/8-16 Manual Focus T-Mount Lens SLY650T

Product Highlights

• Super Telephoto Zoom
• Requires Camera-Specific T-Mount

This extreme 650-1300mm f/8-16 Manual Focus Lens from Bower is an economical way to achieve some ultra-telephoto photography, all the way up to 1300mm.  This is a T-mount lens, which means that aperture is not communicated to or controlled by the camera body, and as such must be used only in aperture-priority autoexposure mode (if your camera has it) or in the manual exposure mode.  There are T-mounts available for every modern DSLR system as well as for older film cameras and even C-mount cameras.

It will work on both "full frame" digital cameras as well as the smaller-format APS-C (15 x 22mm) cameras, but has only one effective aperture at any focal length, which varies from f/8.0 at 650mm to f/16.0 at 1300mm.  That's not much of a hindrance, however, as you'd likely use this lens at its relatively small maximum aperture in any case.

This lens requires bright light and a high ISO setting on the camera to get a fast shutter speed (or fast film in a film camera), and needs a sturdy tripod or monopod, but can deliver very sharp results if used properly.

• The lens features an incredible zoom range.

• This lens has a two-touch zoom/focusing system. There is a

   push-pull ring for zooming, and another ring for focusing.

• Multi-coated elements reduce flare and increase light transmission.

• The white lens barrel helps reduce heat buildup.

• The aperture is fixed-position, but only varies based on focal length.

• It has a deep lens shade with matted, dark internal coloring.

• The lens has a tripod mount upon its lens barrel.

Filter Size	95mm
f/Stop Range	f/8.0-16.0 (only one effective aperture at any focal length)
Minimum Focus Distance	16.4' (5.0 m)
Magnification	Not Specified by Manufacturer
Zoom/Focus Control	Two-touch (push-pull ring for zooming, separate ring for focusing)
Angle of View	3.8-2.0°
Groups/Elements	5/8
Length	23.3" (592mm) @ 1300mm focal length
Maximum Diameter	4.1" (105mm)
Weight	4.4 lbs (2 kg)