Offered for auction is a superb Sirius 500mm f8 mirror telephoto lens, this item is in excellent optical and cosmetic condition. As is usual with mirror lenses the lens is extremely light and compact, and is suitable for film and digital SLR cameras in manual mode.   I have included a comparison shot with a standard 50mm lens from the same position to show the effective magnification. These images have been post processed to show the obtainable quality.   *The lens can be supplied with a mount to fit Pentax K or Canon EOS, (please specify on close of auction). Focusing and metering will be manually operated – some exposure compensation may be required.   With a focal length on offer of 500mm and up to the equivalent of 800mm!!! on digital cameras, this lens is ideal for sports or wildlife use, and will enable the user to get up close to the action. The lens has exceptional close range performance with a ratio down to 1:2.7.   The sale is complete with a rigid case and front lens cap.   Condition: The front and rear lens elements are bright and clear The internal mirrors are bright and clear The focus ring operates smoothly The lens barrel is in excellent condition   Included in Auction: Sirius MC Mirror Lens 1:8.0 f=500mm Front lens cap Rigid carry case Mount to fit either Canon EOS, or Pentax K (Please specify)   Specifications (Lens): Focal length 500mm f8.0 equivalent aperture T Mount Minimum focus distance 3.0m (less than 10ft) Filter dia. 72mm Serial no.510742   Compatibility: All Pentax M42 screw mount (e.g. Spotmatic F, SP 1000 etc), Fujica, Zenith, Practica, some Yashica, Contax All Canon EOS 3, 5, 50, 500 etc. and digital cameras such as D30, D60, 10D, 20D, 300D, 350D, 400D, 1D, 1Ds  and many others. All Pentax film and digital K/KA Bayonet mounts (ME super, MX, ME, K100D, 200D, 10D, 20D, 110D, *ist  etc), including some Ricoh, Miranda, Vivitar, Cosina and Chinon. Of course the use of widely available conversion adapters will allow the use of this lens on virtually any film or digital SLR camera.   A growing number of Digital SLR users are using older manual lenses providing a much cheaper alternative to the prohibitively expensive branded system lenses. You are buying from an established ebay seller and can bid with confidence - check my feedback. My postage, packing, and handling charges are also very competitive.   All my items are carefully checked for functionality before dispatch, and you are reassured that any defect will be highlighted in my item description. I am afraid I cannot provide refunds in the event of loss in postage, proof of postage will always be obtained and provided to the buyer if requested. If the buyer requires an insured service this must be requested at the time of sale.