Special 2/28mm lens Helios Biotar type USSR for film camera rare unknown

SPECIAL LENS 28mm F2 MADE IN USSR ITEM'S CONDITION: WELL-USABLE The glass is clean and should bring nice images, without scratches, separations or fungus, but some cleaning marks at optics and some pieces of dust inside can be found. Aperture blades open and close smoothly, focusing is a bit tight. Cosmetically the lens looks nice (just examine item's photos, please). Some extra holes were drilled at casing by previous owner for DIY project. It will not impact on optics and aperture. TECHNICAL FEATURES * Brand: Made in USSR * Model: Unknown * Focus: 28 mm. * Frame size: should cover at least 18x24mm, I don't sure about 24x36mm. * Angle of view: about 45 degrees for 18x24mm frame size. * Relative aperture: 1:2. * Aperture: from 2 up to 16 (with f-stop clicks). * Mounting: screw mount about 26mm, optical registration is very short. * The lens has focus adjstment and distance scale from 2m to infinity with stop-clicks at indexes with distances. * Very good idea is to use the lens with mirrorless digital MFT cameras if you'll create the adapter for it. * Dimensions: length 18 mm, diameter 28 mm. * Weight: 16 g. * Made in USSR. THE ITEM COMES WITH Lens #23789 only ABOUT PHOTOS The item pictured is the actual item for sale. You can see exactly what you are buying. SHIPPING We are more than happy to welcome any international buyers! We ship the item FREE WORLDWIDE (exclusions are exists, you can ask Me before purchase to be sure)! Item will be shipped via Russian Post service during 3 days upon receipt of your payment. Shipping time is mostly about 4-6 weeks to receive the item as Registered Air Mail package with the tracking number (or by registered and insured Air Mail parcel for heavy items), but sometimes (but not very often) it can be up to two month.