Clavius 300p and ASI 290MM High resolution

Clavius 300p and ASI 290MM High resolution

Postby ngp » Sat Jan 07, 2017 12:22 pm

Here is Clavius taken with a ASI290MM Cam, and SW 12" Newtonian Altair IR685 Planet killer Filter
Also in colour stats on page a little fine detail is lost from Flickr conversion
https://www.flickr.com/photos/16601714@ ... 5/sizes/o/

https://www.flickr.com/photos/16601714@ ... ed-public/
Full size
https://www.flickr.com/photos/16601714@ ... 5/sizes/o/
ngp
 
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Re: Clavius 300p and ASI 290MM High resolution

Postby Aratus » Sat Jan 07, 2017 2:19 pm

Are you sure you didn't rent a spaceship and took this from orbit! :D

A fantastic image.
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC and Canon 500D for imaging.
Aratus
 
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Re: Clavius 300p and ASI 290MM High resolution

Postby ngp » Sun Jan 08, 2017 1:02 pm

Cheers Aratus. yes I am off to Mars at the end of the month :mrgreen:
I haven't posted on here for sometime. But I started my early astronomy coming here many years ago.
Sometimes I like to look in to friendly places again. As per the join date I didn't join in 2012 I rejoined.
I was coming here late 2007 many moons ago
ngp
 
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Re: Clavius 300p and ASI 290MM High resolution

Postby Aratus » Sun Jan 08, 2017 4:21 pm

If you are going Mars, do wrap up warm. :D

As a lunar observer of some years, and someone who is always trying to improve his images could you let us in on some of your techniques? Obviously a 12" Newtonian gives you some advantages, but do you use a barlow lens with it? Is there any special technique with getting the focussing right. How many frames do you take, and how many of them do you use? Do you go for fast exposures and ignore the grain or use low ISO figures with longer exposures? Is all down to the camera you are using?

Clavius is a favourite target of mine. The decreasing crater sizes in an arc on the floor of the crater is a very pleasing effect.

Please continue to post your photos. It raises the bar!
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC and Canon 500D for imaging.
Aratus
 
Posts: 719
Joined: Tue Jan 12, 2016 2:17 pm
Location: East Lincolnshire

Re: Clavius 300p and ASI 290MM High resolution

Postby ngp » Mon Jan 09, 2017 2:32 pm

I will try and give a quick brief opinion on what your asking. First if you want top quality, you need a good telescope, Most small fracs in the UK will never capture Clavius how I have here. It all depends on the quality your after.

Then you need reasonably good collimation. And sufficient cooldown. With large thick mirrors. Focusing is a matter of choice, I like the old method by hand, yes it shakes but I feel connected to it. Just spend time on it, and look for the sharpest view. If in doubt keep refocussing until you are sure you are at least in a sharp zone.

Better cameras help. With noise and frame rates.

I try to capture at least 8000 frames for high power work
often 10000. Stack on AS/2 I try to keep gain down 50% is good, a little higher is ok if you stack more frames. And as fast a exposure as you can get with medium gain. And healthy histogram signal. Finally for high power work only bother when the moon is at its highest. And good seeing will bring the quality. if everything else is optimum. Poor seeing will still get a result. But not like this. Hope that's helpful
ngp
 
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