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Author Topic: The effects of moonlight on deep sky images, for newer imagers.  (Read 2945 times)

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Offline koootzz

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When I first started out imaging I didn't know how much of an effect moonlight has when imaging deep sky so I'm hoping this post might help some of our newer imagers.

Normally I'll capture my subs in one night or two, however this time I've captured 10 minute subs of the flaming star nebula over an extended period. I've always avoided imaging when the moon is near full and is actually in the sky.

I've got three sets of subs as detailed below:

Set 1 : Moon 46% full and approx 60 degrees from the target.

Set 2 : Moon 97% full but not actually risen although not far below the horizon, again about 60 degrees from the target.

Set 3: 8 hours before moonrise so we can assume that the moon has no effect on the image.

I've attached an image from each set below, as you can see the moon has quite a drastic effect. I've got to admit it surprised me just how much, especially when the moon is still below the horizon. Personally, I'll still attempt imaging some deep sky objects when the conditions are like set 1 but will be sticking to brighter objects, the faint stuff will have to wait until there's no moon present.

The purple tint is the result of a modded DSLR and CLS filter.

HTH

Leigh
vixen 60s, modded 1000D, modded 300D, DSI I, 10" dob (work in progress), some other bits and a stupendous talent for attracting cloud!

Offline psjshep

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Re: The effects of moonlight on deep sky images, for newer imagers.
« Reply #1 on: 13:44:18, 30 January, 2011 »
Nice 1, Lee...

This very good evidence & I hope people who do not appreciate the full effect the moon has on imaging now see what the blighter can do..

Phil
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Offline dciobota

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Re: The effects of moonlight on deep sky images, for newer imagers.
« Reply #2 on: 18:45:22, 30 January, 2011 »
 Excellent example Leigh!

 My rule of thumb is to not bother deep sky imaging during the period between first and last quarter, essentially two weeks, no matter where in the sky.  Atmospheric dispersion would play a big role too, the worse the transparency the worse effects from the moon (and light pollution in general).
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Offline psjshep

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Re: The effects of moonlight on deep sky images, for newer imagers.
« Reply #3 on: 18:55:39, 30 January, 2011 »
... although I have used narrowband during these cycles... as so long as the target is not in the general vacinity of the moon, Ha OIII & SII work fine...

Phil
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Offline swashy

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Re: The effects of moonlight on deep sky images, for newer imagers.
« Reply #4 on: 07:48:39, 31 January, 2011 »
A good comparitive description Leigh  :urock:

I would be very interested to see similar before and after results with using a Ha filter, as I am quite tempted to buy one, as the moon always seems to be around when it's clear
Ade

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Offline psjshep

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Re: The effects of moonlight on deep sky images, for newer imagers.
« Reply #5 on: 08:52:20, 31 January, 2011 »
A good comparitive description Leigh  :urock:

I would be very interested to see similar before and after results with using a Ha filter, as I am quite tempted to buy one, as the moon always seems to be around when it's clear

I will have a go at this if I ever get a chance.... to add insult to injury, the Obsy PC's m/b is now bust (it was >5 years old)

Phil
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Offline Geoff_k

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Re: The effects of moonlight on deep sky images, for newer imagers.
« Reply #6 on: 17:41:34, 01 March, 2011 »
Just saw this so a bit late to the party but a very interesting comparison.

The problem I have had and I suspect I am not alone, is that in my neck of the woods clear moonless nights over the last few months have been as rare as rocking-horse do-do.


Geoff

Offline Sanddune

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Re: The effects of moonlight on deep sky images, for newer imagers.
« Reply #7 on: 20:24:22, 14 August, 2011 »
This is fantastic news! I used my QHY8 for the first time on M57 the other night when the Moon was in the sky. My subs looked exactly like no.2 above. I tried darkening them in processing and wound up with no colour. I really didn't think the Moon was bright enough at the time to have this affect.
Thanks for taking the time to post these - they were a big help.
David
Welford Observatory
Nr. Oxford UK
www.sanddune.info
EQ-5Pro / C10-N / C8-N / Orion ED-80 / Startravel-80 / QHY8Pro / QHY6 / Canon 500d / Celestron NexImage

Offline koootzz

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Re: The effects of moonlight on deep sky images, for newer imagers.
« Reply #8 on: 19:56:29, 16 August, 2011 »
Hi David and welcome, glad this was of use to you  :thumbup:.
Leigh
vixen 60s, modded 1000D, modded 300D, DSI I, 10" dob (work in progress), some other bits and a stupendous talent for attracting cloud!

Offline masterpikey

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Re: The effects of moonlight on deep sky images, for newer imagers.
« Reply #9 on: 18:22:58, 30 August, 2011 »
fantastic demostration m8, and ty.  I was verry supprised to see the effect of them moon when its below the horizon

 

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