 BetterPhoto Member |
Elan 2 with kenko 2x magnifier Celestron 750 Telephoto.I recently purchased a Kenko c-af1 2x Teleplus mc7 I want to use this to get Eagles in the top of very high Spruce trees.I have the correct T-mount,but the camera doesen't work.I suspect it is a light problem.the lens in the magnifier is quite small.could you suggest a magnifier with larger lens that would give more light transmition? Thanks Jim
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Jon Close |
Re: a teleconverter that allows greater light transmission, there aren't any. The elements are small diameter because a teleconverter works by magnifying the central portion of the image provided by the main lens. A 2x TC will always result in a 2-stop decrease in light transmission. What do you mean by "doesn't work?" The shutter cannot be fired? I don't know what would be inhibiting it. If you mean that the camera displays "00" for the f-stop, that is normal when using fixed aperture non-EF lenses like an f/8 mirror lens or your telescope with a T-mount. If you are using Av or M modes, leave the aperture set to "00". Don't use Tv mode as the camera cannot adjust the aperture to match the selected shutter speed.
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