Opteka 500mm Mirror Lens Reviews & Specifications

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The Opteka Mirror Lens is
Incredibly compact and Lightweight

Opteka 500mm f/6.3 High Definition Telephoto Mirror Lens Using an advanced reflex design, this is a mirror lens that is ideally suited for wildlife photography and sports photography. It has a fixed aperture of f/6.3.

When combined with the T-mount to fit your camera system, this Opteka mirror lens incorporates advanced computer designed optics and the latest in multi-coating techniques. The process of multi-coating assures virtually flare free photographs even under adverse lighting conditions resulting in crisp high contrast pictures with full color fidelity.

Catadioptric lenses have several drawbacks. The fact that they have a central obstruction means they cannot use an adjustable diaphragm to control light transmission. This means the lens's aperture value is fixed to the overall focal ratio of the optical system (typically f/8 for 500 mm designs, or f/11). Their modulation transfer function shows low contrast at low spatial frequencies. The folded optical path does reduce the length of the lens, but increases its width.

Their most salient characteristic is the annular shape of defocused areas of the image, giving a doughnut-shaped 'iris blur' or bokeh, caused by the shape of the entrance pupil.

Currently only Sony (formerly Minolta) offers a 500 mm catadioptric lens for their Alpha range of cameras. Samyang offers a variety of uniquely priced optics, delivering a lot of optical capability for very little money. These rebranded catadioptric lenses are available under the names of Bower, Opteka, Phoenix, Rokinon, Sakar,  Vivitar and others.

Mirror lenses can produce pictures and under carefully chosen conditions they may even produce pretty good ones. However, these situations are rare and therefore most will have unsteady background blur. Most mirror lenses suffer from a rather mediocre optical performance. This may all be fine for personal purposes and for documentation but most likely you'll not be able to sell such pictures. Therefore a classic (refractive) lens like a 400/5.6 fix-focal or even a xx-500mm zoom or even a 70-300-f/4-5.6 with a 1.4 or 2x teleconverter is usually a better and more serious approach. Nonetheless mirrors are quite cheap (but you get what you pay for).

(To rephrase the paragraph above: Mirror lenses are Junk!)


Advances in high-index / low-dispersion optical glasses, new barrel materials, and exotic anti-reflection coatings, along with the latest in computer-aided-design / computer-aided-manufacturing, are combined to produce lenses of unprecedented quality. Diamond-cut from crystal-clear, water-white optical glass, Opteka lenses are ground and polished to a precise precision.

Shop for the Opteka 500mm f/6.3 Telephoto Mirror Lens from these stores
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Lens style Catadioptric mirror
Max Format Size 35mm  
Lens focal length500mm  
Stabilization type No
Camera mount Camera specific T-mount
Angle of view 4.1 x 2.7 (WxH)
2.6 x 1.7 (WxH) w/ APS-C (15 x 22mm) cameras
Largest aperture opening f/6.3 (fixed)
Smallest aperture opening f/6.3 (fixed)  
Includes aperture ring No  
Total diaphragm blades None
Total Elements 7  
Number of Groups 6  
Coatings / special elements Multi-coated  
Minimum focus distance 6.6' (2.0 m)  
Autofocus type No
Motor No  
Full time manual focus Yes  
Focusing method N/A  
Lens distance scale None  
Depth of field scale No  
Overall weight1.55 lbs (705g)  
Lens diameter 3.9" (98mm)  
Overall length 4.7" (120mm)  
Construction materials Composite / Glass  
class="label">Lens ColorWhite  
Zooming method N/A  
Filter thread size 95mm front, 34mm rear  
Lens hood included No  

Lens Includes
Opteka High Definition 500mm F/6.3 Mirror Telephoto Lens,

T-Mount Adapter


Front and Rear Lens Caps.



Opteka 500mm f/6.3 High Definition Telephoto Mirror Lens

Opteka 500mm f/6.3 High Definition Telephoto Mirror Lens

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