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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial
Thread started 11 Jan 2018 (Thursday) 06:45
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Orion wide field

 
basketballfreak6
Goldmember
Joined Jan 2011
Brisbane, Australia
Post has been edited 1 month ago by basketballfreak6.
Jan 11, 2018 06:45 |  #1

IMAGE: https://farm5.staticflickr.com/4603/25758732578_294889d773_b.jpg
[IMAGE'S LINK: https://flic.kr/p/Ffde​LW] (external link)Orion Wide (external link) by Tony (external link), on Flickr

modified 760D + 70-200L II @200mm with STC astro-m lp filter
shot in suburban backyard in Brisbane, tracked with star adventurer

struggled a bit with the tracking here...i don't think it's bad alignment because i was able to get 2 min tracking on some frames just very inconsistent, dropped it down to 45 seconds and still not consistent, not sure if it's because it was windy, or just bad tracking by tracker itself or maybe i need to get another counterweight to balance the setup better

would love to hear what you guys think particularly with editing side of things, i know i still need to capture subs separately for the bright core and also how do you guys deal with halo around bright stars?

https://www.instagram.​com/tony.liu.photograp​hy/ (external link)
flickr (external link)
https://500px.com/tony​_liu_photography (external link)
5DIV, 5DIII, modified 760D, 16-35L f/4 IS, 24-70L II f/2.8, 70-200L IS II f/2.8, S150-600 f/5-6.3 SPORT, S14 f/1.8 ART, S50 f/1.4 ART, S135 f/1.8 ART, 100L IS Macro f/2.8

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Celestron
Cream of the Crop
8,435 posts
Gallery: 1 photo
Joined Jun 2007
Texas USA
Jan 11, 2018 08:39 |  #2

Excellent capture there !




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basketballfreak6
THREAD ­ STARTER
Goldmember
Joined Jan 2011
Brisbane, Australia
Jan 11, 2018 14:14 |  #3

Celestron wrote in post #18538608 (external link)
Excellent capture there !

thanks mate :D


https://www.instagram.​com/tony.liu.photograp​hy/ (external link)
flickr (external link)
https://500px.com/tony​_liu_photography (external link)
5DIV, 5DIII, modified 760D, 16-35L f/4 IS, 24-70L II f/2.8, 70-200L IS II f/2.8, S150-600 f/5-6.3 SPORT, S14 f/1.8 ART, S50 f/1.4 ART, S135 f/1.8 ART, 100L IS Macro f/2.8

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MalVeauX
"Looks rough and well used"
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Joined Feb 2013
Florida
Jan 11, 2018 14:50 |  #4

Looks great.

The really impressive thing is capturing all that minute dust surrounding the complex.

I think a little wider FOV to do a different composition would be stronger, but that's being nit-picky.

At this view scale, it looks good. At large scale view, the stars have some shape to them, from the tracking perhaps. If you were running pHD guiding software, you could nail down the tracking error pretty quickly.

Very best,


My Flickr (external link) :: My Astrobin (external link)

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basketballfreak6
THREAD ­ STARTER
Goldmember
Joined Jan 2011
Brisbane, Australia
Jan 11, 2018 15:02 |  #5

MalVeauX wrote in post #18538827 (external link)
Looks great.

The really impressive thing is capturing all that minute dust surrounding the complex.

I think a little wider FOV to do a different composition would be stronger, but that's being nit-picky.

At this view scale, it looks good. At large scale view, the stars have some shape to them, from the tracking perhaps. If you were running pHD guiding software, you could nail down the tracking error pretty quickly.

Very best,

thanks mate, you're right tracking definitely not perfect

need to try to do it again on a (hopefully) windless night, i feel like that setup it shouldn't have problems tracking 45 seconds without guiding

that and maybe trying extra counterweight


https://www.instagram.​com/tony.liu.photograp​hy/ (external link)
flickr (external link)
https://500px.com/tony​_liu_photography (external link)
5DIV, 5DIII, modified 760D, 16-35L f/4 IS, 24-70L II f/2.8, 70-200L IS II f/2.8, S150-600 f/5-6.3 SPORT, S14 f/1.8 ART, S50 f/1.4 ART, S135 f/1.8 ART, 100L IS Macro f/2.8

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MalVeauX
"Looks rough and well used"
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Joined Feb 2013
Florida
Jan 11, 2018 15:14 |  #6

What you can do is try to make sure your polar alignment is tighter, that will help quite a bit here. I'm not sure how you're currently doing it, but you can start to build up "drift alignment" as a tool in your toolbox to supplement polar alignment.

https://www.cloudynigh​ts.com ...ment-by-robert-vice-r2760 (external link)

If you're precisely polar aligned, at wider FOV angles like you're using, you'll get tracking of 2~4+ minutes without much period error.

Other things as you already mentioned are ensuring your setup is balanced very precisely so that after it changes arcs the weight shift doesn't cause problems. Also, less strain on the worm gear and cogs if you're balanced properly. Weight matters a lot, and when you're at the limits of the mount or undermounted, this kind of issue is prevelant. If you overmount, you'll have it a lot easier. You can look to shed some weight by considering that you don't need to use that 70-200 and instead, get a simple prime lens in the focal length that you prefer for FOV. You don't have to use an AF Canon lens. You can instead use inexpensive high quality primes that are legacy, such as M42 (Pentax) mount Super Takumar lenses adapted to the EF mount. You could a 50mm F1.4, 135mm F3.5, 200mm F4, etc, all lighter weight, inxepensive, sharp, good multi-coating, and you can stop them down 1~2 stops to get really good coma control and sharpness for cheap and help manage any CA. Worth toying with for these purposes. The 135mm and 200mm are excellent for wide field groupings like you're doing here.

Very best,


My Flickr (external link) :: My Astrobin (external link)

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basketballfreak6
THREAD ­ STARTER
Goldmember
Joined Jan 2011
Brisbane, Australia
Jan 11, 2018 15:58 |  #7

MalVeauX wrote in post #18538844 (external link)
What you can do is try to make sure your polar alignment is tighter, that will help quite a bit here. I'm not sure how you're currently doing it, but you can start to build up "drift alignment" as a tool in your toolbox to supplement polar alignment.

https://www.cloudynigh​ts.com ...ment-by-robert-vice-r2760 (external link)

If you're precisely polar aligned, at wider FOV angles like you're using, you'll get tracking of 2~4+ minutes without much period error.

Other things as you already mentioned are ensuring your setup is balanced very precisely so that after it changes arcs the weight shift doesn't cause problems. Also, less strain on the worm gear and cogs if you're balanced properly. Weight matters a lot, and when you're at the limits of the mount or undermounted, this kind of issue is prevelant. If you overmount, you'll have it a lot easier. You can look to shed some weight by considering that you don't need to use that 70-200 and instead, get a simple prime lens in the focal length that you prefer for FOV. You don't have to use an AF Canon lens. You can instead use inexpensive high quality primes that are legacy, such as M42 (Pentax) mount Super Takumar lenses adapted to the EF mount. You could a 50mm F1.4, 135mm F3.5, 200mm F4, etc, all lighter weight, inxepensive, sharp, good multi-coating, and you can stop them down 1~2 stops to get really good coma control and sharpness for cheap and help manage any CA. Worth toying with for these purposes. The 135mm and 200mm are excellent for wide field groupings like you're doing here.

Very best,

thanks Martin

i started off doing drift, now i use polemaster (best money i've spent) for polar alignment, after alignment i managed to get a couple frames of good 2 min tracking which is why i said earlier i don't believe tracking is the issue here, i am hoping it is just needing more counter weight and or wind giving me grief hahaha


https://www.instagram.​com/tony.liu.photograp​hy/ (external link)
flickr (external link)
https://500px.com/tony​_liu_photography (external link)
5DIV, 5DIII, modified 760D, 16-35L f/4 IS, 24-70L II f/2.8, 70-200L IS II f/2.8, S150-600 f/5-6.3 SPORT, S14 f/1.8 ART, S50 f/1.4 ART, S135 f/1.8 ART, 100L IS Macro f/2.8

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Tyguy
Senior Member
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Joined Sep 2014
Calgary, Canada
Jan 12, 2018 15:27 |  #8

Gorgeous shot!


-Tyler
flickr (external link)

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mjcarson
Member
197 posts
Joined Apr 2009
SF Bay Area, CA USA
Feb 15, 2018 17:31 |  #9

Beautiful shot, nice framing of it, may have to give this one a shot myself.


Matt
Stellarvue 90mm Fluorite, AstroTech 111mm and 72mm, Celestron CPS 1100, Losmandy GM-8, Olympus EM1.2, Modified Olympus EM5.2 and Olympus Pen F. Obviously more gear than talent.

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naddieuk
Senior Member
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Joined Apr 2010
Wales
8 hours ago |  #10

This is just stunning!!!! Was this at ISO 1600?


Canon Powershot S9, Canon EOS 350D.
My Flickr site. (external link)

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andicus
Member
202 posts
Joined Aug 2009
3 hours ago |  #11

Fantastic!


Canon EOS 7D, EOS Digital Rebel XTi / EOS 400D / Kiss Digital X | Canon EF 50mm f/1.4 USM, EF 70-200mm f/2.8L USM, EF-S 55-250mm f/4-5.6 IS |

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