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Old May 6, 2012, 6:18 PM   #1
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Default stacking (soligor) teleconverters, possible or not recommendable?

Hi all,

I was wondering if any of you have experience stacking teleconverters. I can get 2 two 1.7x converters for the price of one 2x converter, and was wondering if it's optically okay to do that, or if it will degrade the image quality too much?

Next month a venus transition will take place; like a solar eclipse except it's not the moon but planet venus will pass in front of the sun. Having the 55-300 DA, stacking two 1,7x's should get me approx 1000mm instead of 600mm -and a max aperture of F20, which is very slow indeed for that amount of zoom. But since I'll be shooting into the sun I should probably consider using some nd filters too

Happy Shooting! GB
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Old May 6, 2012, 6:48 PM   #2
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I haven't tried it myself, but would think it would not be too bad. I don't like the idea of taking pictures directly into the sun, though. For one thing, there is a likelihood of burning a spot on your camera's sensor, and worse, your eye, unless you have a very dark filter on the lens.
The method I have used in the past for solar pictures, is to set up a telescope to project the sun's image onto a screen (just a sheet of paper will do), and set the camera up to shoot the projected image. Much safer, and you can project the image to a size that makes it easy to fill the frame.

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