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Old 31-01-2019, 03:31 PM
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Stonius (Markus)
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QE falloff with 1600 in IR and UV?

I'm toying with the idea of playing with some of these filters for planetary work, but I wonder if the QE falloff in those regions might make it a pointless task?

Has anyone played with a 1600 and UV or IR pass filters with good results? I'm particularly interested in Venus, Mars & Jupiter.

I will be using my RC10, but will have to use a TV Powermate to get the correct image scale so there will be lenses in the way too which I understand can impede transmission at those wavelengths.

Markus
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Old 31-01-2019, 03:57 PM
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Merlin66 (Ken)
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Markus,
Shouldn't be a problem.
I use the ASI 174mm and the ASI 1600mm for solar imaging and can easily image down in the UV (CaK line).
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Old 31-01-2019, 05:49 PM
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Thanks Kevin.
What is your imaging train like? Do you lose much transmission to glass absorbtion?

Am I right in thinking its quite possible that you could end up with only about 80% photon loss due to QE and glass absorbtion?
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Old 31-01-2019, 06:00 PM
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Merlin66 (Ken)
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Iíve used a Genesis 100/500 to get down to 3700A....
The UV (and IR) absorption >3600A and <11000A for Standard lenses isnít that bad....
My current spectroscopy with C11 gets good results across the whole spectrum.
HTH
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