Explains the purpose of stacking teleconverters and how to calculating focal length, aperture, and aperture diameter.
i had just tried this evening using my new 1.4 teleconverter with EOS cameras attached to my scope and couldn't get the camera to work except with the ...
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Yes. Because the teleconverter will degrade your image quality. The 6-element teleconverter degrades the image quality less than the 4-element teleconverter.
Oct 4, 1999 · I have 3 of each, and a Nikon AF300/f4. The 301's are worth about $300 each, the 200's about $100 each, and the Vivitars about $25 each.