Hi everyone.
I was wondering what's your take on using the L-Ultimate under a full moon?
My target will be about 45+ degrees away from the rising position.
Will I still get good Ha and OIII data? Or, am I wasting my time and should wait for another (rare) clear sky?
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I think you'll do fine getting Ha
but getting good OIII is harder when the moon is up
I would still try it; the Ha will certainly show, because I have done that myself with my 3nm filter and a moon near full
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I agree with @messierman3000. With 45° to the Moon, I would go for it. Ha will be fine.
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Moonlight has a wavelength of about 395 nanometers…not quite as blue as direct sunlight.
On the other hand, OIII is centered at about 500nm (blue-green)). And Ha is 650 and 700nm (red, right before infrared). So you should see definite rejection of moonlight with a filter that only allows OIII and Ha to pass.
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I have used my ultimate with a bright moon many times. Go for it.
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The L-Ultimate and the Radian Ultra Quad-band are great filters for imaging with a bright moonlit sky.
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It works quite well for Ha, but makes OIII quite noisy and weak (no surprises). Otherwise I'm happy with it, only limited halos around bright stars. See a picture 4 days after the full moon - 24th August at 02:25. Single 300 sec exposure, R, G and B channels (screenshot from PI, not full res picture):    |
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I was able to give this a test. Only had time for 54 x 300 second frames under 98% moonlight (no calibration frames) The L-Ultimate is pretty awesome to achieve this 👍🏽 I'm going to add more data when I get clear skies again. Thanks everyone 🙏🏽  |
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