Quote:
Originally Posted by Rob_K
"10.5/1100" (aperture cm/focal length mm?), "MTO-1000 AM" and "N813003".
.... There is also a Hoya 72mm Skylight [1B] Zoom, 28-80mm. ..
Among the smaller items are a Rokinon 2X Auto Tele Converter [OM] (what does this do? like a Barlow?), and a Hoya 49mm Skylight f=28mm lens
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I'm no expert on Olympus lenses but "10.5/1100" presumably means f/10.5 (which in this 110cm focal length is more-or-less 10cm aperture anyway).
You seem to be reading some information from the screw-on filters on the 28-80 and the 28mm: "Hoya 72mm Skylight [1B]" and "Hoya 49mm Skylight" are filters, probably mainly there to protect the front element of the lenses.
The 2X Auto Tele Converter is indeed like a Barlow - should turn the 1100mm into a super-telephoto 2200mm lens! That's x22 compared with the usual 50mm standard focal length for a 35mm film camera, but the aperture will be reduced by 'two stops' to a measly f/20.
I wonder if that mirror lens is now more of a collector's item than anything else? I'd look on the Internet if I were you.