Post by Stephen on Jan 30, 2013 13:06:50 GMT -5
An unusual Telephoto lens these days, a Tamron 4x Telephoto converter lens, from the early 1950's, about the first commercial product that Tamron made I believe.
It fixes to a standard lens filter ring via stepping ring adaptors, and multiplies the standard focal length by 4x, by acting as a simple telescope, complete with an upside down image.
Rather than adding extra lenses to correct the image, it was left simple to get at least a reasonable, if modest, image quality. Light loss is not too bad, better than binocular adapters.
It did not matter that the image was upside down unless a reflex camera was used, of course. I will try it it out with the Olympus Pen PM-1 and a standard 50mm lens, set to infinity, as it has it's own focusing scale. That gives a 200mm, which with cropping for Micro 4/3 format, is a 400mm equivalent view.
Only £4 on ebay, with original box and a decent leather case, it at least makes a sharp telescope of course, but astronomical style image of course, upside down!