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jeffpkamp
sage


Reged: 01/11/13

Astrophotos from my Nexstar 6se
      #5924114 - 06/16/13 05:02 PM

I've read a bit about how people say that long exposure astrophotos with the nexstar mounts is exceedingly difficult. I've never had a nicer mount, so I can't really compare, but I have been pretty happy with the results I've gotten from my autoguided APs.

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.


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AstroTatDad
Pooh-Bah
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Reged: 04/22/13

Loc: Los Angeles - San Diego
Re: Astrophotos from my Nexstar 6se new [Re: jeffpkamp]
      #5924125 - 06/16/13 05:11 PM

nice work! are you using the 50mm mini scope package with this? also did you use a wedge?

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jeffpkamp
sage


Reged: 01/11/13

Re: Astrophotos from my Nexstar 6se new [Re: jeffpkamp]
      #5924133 - 06/16/13 05:18 PM

Last one was the trifid nebula with 2x drizzle using DSS.

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.



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Smittty692k4
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Reged: 07/05/11

Loc: East Bernard, TX
Re: Astrophotos from my Nexstar 6se new [Re: jeffpkamp]
      #5924144 - 06/16/13 05:28 PM

If these were taken with the SE mount, then I'd say these are phenominal.
Regardless, they are still awesome images.


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jeffpkamp
sage


Reged: 01/11/13

Re: Astrophotos from my Nexstar 6se new [Re: jeffpkamp]
      #5924150 - 06/16/13 05:32 PM

I'll have to post a picture of my set up, I am using a home made wedge (cost me about $10-20 to build), and the Orion Magnificent mini auto-guider package.


Here's the eagle nebula with 2x drizzle.

http://i15.photobucket.com/albums/a389/jeffpkamp/eagle2x.jpg


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AstroTatDad
Pooh-Bah
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Reged: 04/22/13

Loc: Los Angeles - San Diego
Re: Astrophotos from my Nexstar 6se new [Re: jeffpkamp]
      #5924170 - 06/16/13 05:49 PM

great work, I almost bought the $400 wedge awhile back, but just thought why not save a few more 100 and get like a CG5. I thought about making a wedge, but I don't have the tools. Again great work, yeah when you get a chance post photos and a run down of your setup and process.

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jeffpkamp
sage


Reged: 01/11/13

Re: Astrophotos from my Nexstar 6se new [Re: AstroTatDad]
      #5924213 - 06/16/13 06:22 PM

Here is my setup (the meat of it at least). One is a close up my wedge. For the wedge, I have two pieces of wood with two door hinges holding them together. I used turnbuckles to make the mount easily adjustable.

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.

http://i15.photobucket.com/albums/a389/jeffpkamp/Photo0616.jpg

http://i15.photobucket.com/albums/a389/jeffpkamp/DSC_6147.jpg


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hopskipson
Pooh-Bah


Reged: 06/24/10

Loc: Queens, New Yawk, Light pollut...
Re: Astrophotos from my Nexstar 6se new [Re: jeffpkamp]
      #5924347 - 06/16/13 08:17 PM

Truly amazing images!

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jhirsch
sage
*****

Reged: 10/06/10

Loc: Ohio
Re: Astrophotos from my Nexstar 6se new [Re: hopskipson]
      #5924509 - 06/16/13 10:05 PM

WOW very impressive.

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AstroTatDad
Pooh-Bah
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Reged: 04/22/13

Loc: Los Angeles - San Diego
Re: Astrophotos from my Nexstar 6se new [Re: hopskipson]
      #5924511 - 06/16/13 10:05 PM

very cool, thanks for sharing.

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Ekyprotic
super member
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Reged: 11/28/12

Re: Astrophotos from my Nexstar 6se new [Re: AstroTatDad]
      #5924745 - 06/17/13 01:08 AM

wow these are spectacular! did you say you could do 10 min exposures? That's amazing! I wonder if AP is easier with the 6 SE on this mount because of how much lighter it is than the 8 SE- even with the wedge I dont believe longer than 1 min exposures were possible with the 8 SE. I wonder how long the exposures would be without the wedge on the 6 SE?

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Ekyprotic
super member
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Reged: 11/28/12

Re: Astrophotos from my Nexstar 6se new [Re: Ekyprotic]
      #5924746 - 06/17/13 01:11 AM

Out of all the SCT in the Nexstar series, which is the best for AP? I would think either the 5 or the 6...... the 5 is lighter than the 6 and has a built in wedge but isnt the 5 SE mount also less sturdy than the 6/8 SE mount?

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Ekyprotic
super member
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Reged: 11/28/12

Re: Astrophotos from my Nexstar 6se new [Re: Ekyprotic]
      #5924750 - 06/17/13 01:16 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?

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Tel
Postmaster
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Reged: 03/31/06

Loc: Wallingford England
Re: Astrophotos from my Nexstar 6se new [Re: Ekyprotic]
      #5924931 - 06/17/13 06:51 AM

Hi Jeff,

Some spectacular imaging there from a home made wedge ! My heartiest congratulations !

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 ?

Best regards,
Tel


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Tel
Postmaster
*****

Reged: 03/31/06

Loc: Wallingford England
Re: Astrophotos from my Nexstar 6se new [Re: Tel]
      #5924939 - 06/17/13 07:07 AM Attachment (50 downloads)

Is this any better, Jeff, with a cropping out of the background image and a little P/Shop manipulation with "Curves" and "High Pass" application ?

Best regards,
Tel

Just an edited footnote. I would personally crop out that magenta coloured left-hand edge.

Edited by Tel (06/17/13 07:11 AM)


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hdt
sage
*****

Reged: 11/10/07

Loc: N35°10' W106°32'
Re: Astrophotos from my Nexstar 6se new [Re: Tel]
      #5924941 - 06/17/13 07:11 AM

Very nice, Jeff!

Spectacular photos!

Love the homebuilt wedge too!


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Peter9
Post Laureate
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Reged: 10/30/08

Loc: Yorkshire - Born & Bred
Re: Astrophotos from my Nexstar 6se new [Re: hdt]
      #5924962 - 06/17/13 07:40 AM

Two wonderful images Jeff, made all the better because of your resourcefulness in make your own wedge. Well done.

Thanks for posting.

Regards. Peter.


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Peter9
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Reged: 10/30/08

Loc: Yorkshire - Born & Bred
Re: Astrophotos from my Nexstar 6se new [Re: Peter9]
      #5924969 - 06/17/13 07:46 AM

Hi. Tel,

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.

Regards. Peter.


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ben2112
scholastic sledgehammer


Reged: 07/12/12

Loc: North Charleston SC
Re: Astrophotos from my Nexstar 6se new [Re: Peter9]
      #5925235 - 06/17/13 11:04 AM

Those are some very nice images. Makes me think about doing a wedge for mine.

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Maverick199
Postmaster
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Reged: 02/27/11

Loc: India
Re: Astrophotos from my Nexstar 6se new [Re: Ekyprotic]
      #5925381 - 06/17/13 12:15 PM

Quote:

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.



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