Astrophotos from my Nexstar 6se
Posted 16 June 2013 - 04:02 PM
I was out this weekend, and got some shots of some luminous nebula at near Sagittarius, and thought I'd share them, I was very happy with the tracking, only 1-2 hiccups over the whole night. These were done with a Nikon D5100, a 6.3FR, and the orion mini-autoguider. Shots are stacks of 3-5 min subs (I can get 10 min subs no problem, but I find more subs give me less noise in the end product than 1-2 long sub.
Posted 16 June 2013 - 04:11 PM
Posted 16 June 2013 - 04:18 PM
Here's the center of the lagoon nebula.
If some one can diagnose the blurring on the edge, I"d appreciate it, i want to say its from the SC mirror being spherical, but I't not positive, as the center of the light field is the center of the photo (as seen by my flats), but the blurring is not centered.
Posted 16 June 2013 - 04:28 PM
Regardless, they are still awesome images.
Posted 16 June 2013 - 04:49 PM
Posted 16 June 2013 - 05:22 PM
On top of the scope is the mini-autoguider set, and a green laser finder I built with a friend. With the 6SE on a wedge, the red dot finder is a nightmare to anyone over the age of 5.
I use a 109 amp hour marine battery to power my scope and computer all night, I also have a homemade dew heater that can keep my scope dry even right next to a swamp (Which is where I go for my dark skies).
I usually use a 6.3 focal reducer/flattener with the set up, makes finding things in the scope much easier. I also image with a nikon d5100.
While not the easiest thing to image with, the 6se is far from unusable for Deep Sky Imaging.
Let me know if you have any other questions.
Posted 17 June 2013 - 12:08 AM
Posted 17 June 2013 - 12:11 AM
Posted 17 June 2013 - 12:16 AM
Posted 17 June 2013 - 05:51 AM
Some spectacular imaging there from a home made wedge ! My heartiest congratulations ! :bow:
As to the blurring at the edges of your image of the Trifid Nebula, I would suggest it may be due to a small degree of coma which these SCTs are prone to produce at the outer regions of the FOV.
A field flattening, focal reducer as I assume you've used, will have some rectification effect but it won't be total. You may also have a little vignetting there which might be contributing: not that I personally can see any.
One aspect to this image though, in contrast to that of the first image, (above), you produced, is the fact that there are two layers visible within it. (?)
Why is this ? Could this be the reason ?
Posted 17 June 2013 - 06:07 AM
Just an edited footnote. I would personally crop out that magenta coloured left-hand edge.
Posted 17 June 2013 - 06:11 AM
Love the homebuilt wedge too!
Posted 17 June 2013 - 06:40 AM
Thanks for posting.
Posted 17 June 2013 - 06:46 AM
Great work with Jeff image . You've sharpened it up no end and brought out the colours in there.
Like you, I think a little cropping would help.
Posted 17 June 2013 - 10:04 AM
Posted 17 June 2013 - 11:15 AM
One other thing, how much vignetting do you get (AP or visually with a 32mm plossl) with the .63 FR on the 6 SE?
Visually not much but for AP, quite some. You can take loads of Flats to eradicate that or crop.
Btw, that's an excellent Trifid and admire your DIY skills.
Nicely re-processed Tel.
Posted 17 June 2013 - 11:22 AM
As for Vignetting, Here is a master flat from my scope with the 6.3 LIke maverick said, I just subtract that out with Deep Sky Stacker. Never noticed it with my eyes, but I'm not really looking for it.
As for why I'm getting good results from the 6se mount, I don't know. Auto guider works great, just need to have it close to balanced. Without autoguiding the tracking is all over the place, making 10-20 second subs a quite difficult
Posted 18 June 2013 - 07:10 PM
I have a C6 SCT OTA and just bought an Orion Magnificent Mini Autoguider - How did you mount your guider to the c6? The Orion uses their standard finder scope shoe, which the Celestron scope doesn't accommodate. I have mine on a camera adapter, but there's too much slop in that setup.
Posted 19 June 2013 - 09:21 AM
I found this a better alternative to the idea of drilling a hole into my OTA.
I am sure there are people on here who have a better way of mounting it than I am using.
Posted 17 November 2013 - 06:30 PM