Watching Over

by Vian Esterhuizen

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Optical devices used between camera and lens to magnify middle part of projected image, effectively turning the lens into a longer (but slower) one.

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Nikon D3000 70-300 Nikon lens - How to get lens converter off the lens?

I put a Vivitar tele converter on my 70-300 lens. It went on easy but wont come off. How do I get the thing to come off my lens? I have a Nikon D3000 camera.
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Does the autofocus work with Tamron 70-200 DI VC USD and Tamron 2x teleconverter?

I'm using a Nikon D800 with a Tamron 70-200 DI VC USD lens. For a upcoming trip I want to know whether it is possible to use the said combination with a 2x teleconverter. On several websites I read ...
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Is there a teleconverter to go between Sony Alpha A77 D and Tamron 70-200 f2.8 (with Sony mount)?

I'm struggling to figure out whether there's a teleconverter (available in the UK now) that will go between a Sony Alpha A77 and a Tamron lens. There seems to be some recommendations I could find, but ...