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Message: <blockquote data-quote="alan_rymer" data-source="post: 1754489" data-attributes="member: 329">In the past I have connexted a scope eyepiece to an old MF 200 mm lens and it worked as a scope, with the drawback of the image being upside down, back to front and facing the wrong way. For me, unusable!.This afternoon I came across a crappy ( pre birding ) Praktica 12x25 bin with one eyepiece broken off above the prism, with the prism loose below it. I wondered ( as you do ( I was at a bit of a loose end )) whether the eyepiece and prism would solve the above problem.  I glued in the prism to the back of the eyepiece took the two rubbers off the objective lens of the bins and pulled these over the eyepiece and prism making and light seal. I placed the eyepiece unit up to the camera end of this old Tamron 80-200mm ( Minolta MD compatible ) lens, and lo and behold, it worked after focussing the lens. The view through this wasn't too bad and would make a decent emergency scope. I even managed a blurred handheld photo through it. I guess that a 12x eyepiece and 200mm lens would give it a magnification of about X48 or 2400mmI then tried the eyepiece on a reasonably modern 100-300mm autofocus/manual minolta/Sony MF mount lens. The amount of light coming through the lens was minimal, so low as to be useless.Does anyone know whyAnyway, with all those old lens out there, and crappy bins to disassemble, there are lots of cheap scopes to be had!</blockquote>