Lunar UV/IR cut + Wratten #25 filters

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turfpit
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Lunar UV/IR cut + Wratten #25 filters

Post by turfpit »

65% waxing Moon captured 18th July 2021 at 17°altitude.
Celestron AVX mount, Celestron C8 SCT, JMI motorised focuser, Skyris 618m CCD camera, UV-IR cut /L + Wratten #25 red filters. 2 filters used as captures only 35 minutes after sunset.
Autostakkert!3, Registax 6, GIMP for processing.

Plato-with-2-filters.PNG
Plato-with-2-filters.PNG (353.13 KiB) Viewed 233 times

Clavius-near-terminator.PNG
Clavius-near-terminator.PNG (364.29 KiB) Viewed 232 times

Dave
timh
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Re: Lunar UV/IR cut + Wratten #25 filters

Post by timh »

Dave, Astonishingly good. Your best yet?

The top image really captures something about how high some of the lunar peaks and mountains are because the curvature of the moon provides a sense of scale. In the bottom image the resolution of detail must be as good as a mile and a half or so?

Tim
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turfpit
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Re: Lunar UV/IR cut + Wratten #25 filters

Post by turfpit »

Thanks Tim. I think the mile and a half is about right considering the equipment and comparing with Virtual Moon Atlas. Those are about as good as I will get. Any improvement now will be brought about by better atmospheric conditions/higher elevation. The combination of UV/IR and #25 red allowed reasonable captures during daylight (30m after sunset) although the double filter reduced fps from 120 to 49.

Over a 1 hour session I captured around 60Gb of data. With the moon at 17° and sinking into the west with some haze, those 2 images were the only decent ones from the session - 3Gb useable data out of 60Gb. The effect of the haze only came out in processing. All 2x Barlow images were poor. Higher elevation will arrive in the Autumn.

I am looking forward to some LRGB imaging of Jupiter and Saturn during August. Astronomical Dark will be back with me then at 53°N.

Dave
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