Sima SLS-20 2x Telephoto Conversion Lens. The Sima SLS-20 2x Telephoto Conversion Lens is an accessory lens to supplement a camcorder or a digital camera.
eyepiece to make telephoto lens into telescope - Camera Hacker
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I bought a Sunagor PATP 54038748 OP Telephoto lens adapter for my Canon Olympus telephoto lens with a 3 x converter. I don't know if they still make them ...