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Old 26-04-2013, 08:24 PM
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MGTechDVP (Mariusz)
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I love a Saturn, M20 & M83 under a moon lit sky

Hi All,

I had a bit of luck with the weather during the week. I setup specifically to image Saturn but on the night of 22/23rd April I couldn't get any clear images of Saturn, and even through the eye piece it looked softish so I decided to give M83 then later M20 a go through the 0.63X focal reducer.
I didn't use the LPR/UHC filter since the last time I tried using it, the week before, I didn't see too much of M83 on even longer exposures through it.
The M83 is imaged through a unmodded DSLR and M20 is through the modded camera.

The next day I setup to try Saturn again and after checking and adjusting the collimation I looked at it through the 25mm eyepiece and it was solid, stable and clear, so I tried it through the 7mm and at 290X it was still stable, clear and solid so I pulled out my 5mm X-Cel (which doesnt get used too much) and to my disbelief, at 406X magnafied, Saturn was big, clear, detailed and stable... I mean I saw 5 points around it (4 of which turned out to be its moos and one was a star accrding to the GasGiants app) there were band visible on the globe, the rings were clear, the Casini division was visible and so was the shadow of the rings on the globe... but to my disbelief it was yellowish/brownish.. not just gray... there was color!!I spent about a half hour just starring at it... I knew I had to image it.
The pic with Saturn and moons is double exposed at F10, as in first exposed for Saturn then 2 second exposure for the moons. The others are through the 2.5X power mate and 3X Barlow.

I also tried a different method of Polar alignment, I got a polar scope for the CGEM, so I used that for polar alignment instead of drift alignemt and I think it was a lot closer to the SCP then what I had before... it's quite hard to see the guide stars since they are not illuminated but eventually I lined it up to SCP, it only took about 10 mins.

Imaging Specs:
M20: 30 x 90sec subs & ISO800 on Modded DSLR
M83: 45 x 120sec subs & ISO1600 on unmod DSLR
Saturn: DMK 21au618 through RBG filters


Mariusz
Attached Thumbnails
Click for full-size image (M83 Southern Sprial 22-04-2013.JPG)
113.6 KB104 views
Click for full-size image (M20 Trifid 22-04-2013.JPG)
146.7 KB97 views
Click for full-size image (Saturn Moons 24-04-2013.JPG)
16.6 KB95 views
Click for full-size image (Saturn F25 24-04-2-13.JPG)
18.8 KB93 views
Click for full-size image (Saturn F30 24-04-2-13.JPG)
21.6 KB110 views

Last edited by MGTechDVP; 26-04-2013 at 08:29 PM. Reason: typo
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Old 26-04-2013, 08:40 PM
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Rod771 (Rod)
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Very good Mariusz!

Nice shots , the Trifid is excellent
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Old 26-04-2013, 08:41 PM
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Larryp (Laurie)
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Nice work!
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Old 26-04-2013, 09:16 PM
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JZ (Ross)
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Very nice shots. Love the one of Saturn with moons.
Well done!
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Old 26-04-2013, 10:24 PM
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Moonman (Michael)
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One way you can double check your allignment is to park your scope and thenimage the SCP for 5 to 10 minutes and see if the resulting concentric circles match up to the centre of the frame.

Nice shots too. Love the colours. When you improve your guiding and allignement your pleasure will only increase.

Last edited by Moonman; 26-04-2013 at 10:26 PM. Reason: addition to text
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Old 26-04-2013, 10:31 PM
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EricB (Eric)
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Very nice shots Mariusz.

Eric
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Old 27-04-2013, 04:19 AM
CarlJoseph (Carl)
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These are wonderful. Very well done Mariusz.
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Old 27-04-2013, 06:44 AM
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Gem (Grant)
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Great shots! I especially like the Saturn shots (I find planets harder to image).
Question though - if you have a CGEM: why not use the polar alignment feature of the mount?
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Old 27-04-2013, 09:43 AM
Dennis
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Quite a varied collection you have snared; Solar System, Galactic and extra-Galactic!

Cheers

Dennis
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  #10  
Old 27-04-2013, 02:58 PM
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MGTechDVP (Mariusz)
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Thanks for the positive comments. I was quite happy with what I got, especially during a 75% full moon.

Michael, that is a great tipto sus out the polar alignment accuracy and Grant, I do use the CGEM polar align feature to start with, and it is very good for observing or planetary imaging, but for long exposure is still a bit off, so even a 90-120 second exposure has star trails. So I'll align using the mount alignment then normally I'd do a bit of drift alignment (or attempt to) and its still a hit and miss ordeal for me, but the polar scope seems to have taken a lot of the guess work out and was a lot quicker. I still got stretched starts on average about 1 out of 3 and thats using off axis guiding using the NexGuide. Next time I'll try out the periodic error correction.

Dennis you know how it is, you reach for the sky, end up imaging a galaxy, hence the M83, but on the way back we're a bit closer and spend a bit of time at the Trifid Nebula, then stop by Saturn.

Mariusz
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