Thread: Exposure Chip
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Old Friday 10th June 2016, 13:11   #10
Paul Corfield
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Join Date: Feb 2005
Location: Corfe Mullen, Dorset, UK
Posts: 3,010
Originally Posted by Musoman View Post
The helical TC sounds like a great idea. I might have to have a hunt for one in the future
Look for the Vivitar or the Teleplus ones. One is a rebranded version of the other. With that type, the front of the teleconverter extends out as you turn the rubber grip. As a 2x teleconverter they are pretty sharp too so the housing that holds the elements is worth keeping. I have two in Nikon mount, one I kept the glass in and the other I removed it, paid around 15 to 30 but they can go for much higher, seen them at 100 for example. There other types of helical macro focusing teleconverters (Elicar Macronet and Panagor) where all the movement is internal and so these don't work as a helical focuser as nothing actually extends.

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