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Foto Fair Post your photos for friendly, non-critical feedback. This is the place to show pictures if you aren't yet ready for full-blooded critique, or simply want to share an interesting picture with other e-group visitors.

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  #211  
Old 4th December 2016
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Re: Astro Photos

An absolutely stunning shot (or is that shots [plural] for a stacked image?).
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  #212  
Old 5th December 2016
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Re: Astro Photos

This site has a great forum showing what astro photos are possible using less than 30sec total exposure integration time. Many of the images are produced using DSLRs

It has given me ideas for new targets.

https://stargazerslounge.com/topic/2...lenge/?page=14
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  #213  
Old 5th December 2016
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Re: Astro Photos

Thanks for the link Dave. Impressive as they are I would like to know a bit more about where they were taken as light pollution makes a huge difference in the total exposure time required to get something worth looking at.
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  #214  
Old 5th December 2016
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Re: Astro Photos

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Originally Posted by OM USer View Post
An absolutely stunning shot (or is that shots [plural] for a stacked image?).
Thanks . Astrophotography is a bit of an odd art. You get improvement not by better technique or framing but by taking more (a lot more) of the same.
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  #215  
Old 3rd January 2017
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Re: Astro Photos

Everything worked last night after many failed attempts. Managed to finally get 10 x 8 minute shots of the Elephant Trunk Nebula. Needs more data but at least I got it.



EM5 Mk2 on 550mm scope with guiding.
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Last edited by wornish; 3rd January 2017 at 02:19 PM. Reason: Further post processing
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  #216  
Old 4th January 2017
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Re: Astro Photos

That's a real challenge Dave using the sort of equipment and location we have. Its not on my list of astro things to photo unless I go up to narrow band imaging
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  #217  
Old 4th January 2017
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Re: Astro Photos

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That's a real challenge Dave using the sort of equipment and location we have. Its not on my list of astro things to photo unless I go up to narrow band imaging
I realise that after having tried it It was ideally located so I thought I would give it a go.

I am going to persevere a bit longer and try and get another hour or so worth of exposures tonight if possible before Dew stops play.

Finally managing to get targeting to work after having more than a few wasted nights taking pictures of random star fields over the last few weeks. The Elephant Trunk is completely invisible to the naked eye or even using Olympus Capture on Boost, so you have to get the location spot on and take long exposure shots. Going to try 10 min exposures tonight now I have discovered the EM5mk2 was set to limit Bulb time to 8 minutes, so now upped it to 15.
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  #218  
Old 4th January 2017
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Re: Astro Photos

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I am going to persevere a bit longer and try and get another hour or so worth of exposures tonight if possible before Dew stops play.
Considering the kit you have I do think investing in dew controllers a must.
I have 3 heater tapes, one for the camera lens one for the tracking scope and one for the polar scope using a 4 way controller. I got mine from FLO but two of the tapes cables pulled out from the tape requiring me to solder them back in. I have since seen what looks a much better set of tapes from www.dewcontrol.com
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  #219  
Old 4th January 2017
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Re: Astro Photos

Quote:
Originally Posted by birdboy View Post
Considering the kit you have I do think investing in dew controllers a must.
I have 3 heater tapes, one for the camera lens one for the tracking scope and one for the polar scope using a 4 way controller. I got mine from FLO but two of the tapes cables pulled out from the tape requiring me to solder them back in. I have since seen what looks a much better set of tapes from www.dewcontrol.com
Dew control is my next purchase did you get the HiTecAstro - 4 port 4 channel controller from FLO or should I look at this other site for theirs?
I will certainly get tapes from your link - thanks for the info.
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  #220  
Old 4th January 2017
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Re: Astro Photos

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Dew control is my next purchase did you get the HiTecAstro - 4 port 4 channel controller from FLO or should I look at this other site for theirs?
I will certainly get tapes from your link - thanks for the info.
Yes i did get the quad HiTecAstro controller and quite like it because it has nobs for setting the tape current, although having set them half way I have not touched them so Dew Controls option may be better.
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  #221  
Old 4th January 2017
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Re: Astro Photos

Lesson Learnt !
This is a stack of 8 x 10 minutes exposures and is one of the technically best astro shots I have done with the EM5mk2. Great round stars.
Only problem is I got the wrong target because the star chart I used for targeting was set to the incorrect time - ah well you learn from your mistakes I thought it was going too well.

Did manage to get two satellites as well

[IMG][/IMG]
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  #222  
Old 4th January 2017
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Re: Astro Photos

and who said astro imaging was easy!
But why the 8 min subs rather than 1 min subs

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  #223  
Old 4th January 2017
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Re: Astro Photos

... also are the star spikes from the scope or processing ?

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  #224  
Old 5th January 2017
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Re: Astro Photos

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Originally Posted by crimbo View Post
and who said astro imaging was easy!
But why the 8 min subs rather than 1 min subs

Sent from my Nexus 7 using Tapatalk
I was trying to capture The elephants trunk nebula which is very feint, longer exposures give you more signal less noise when stacked, the sensor noise is averaged out in stacking. The shot above taken earlier this week was taken using 10 x 8 minute subs. BUT I missed the target the second time trying to get more data. Some of the shots people have taken are 15min subs!

Quote:
Originally Posted by crimbo View Post
... also are the star spikes from the scope or processing ?
Sent from my Nexus 7 using Tapatalk
I was fed up because I missed so added the star spikes in processing. You normally get them when using reflector scopes not refractors.
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  #225  
Old 5th January 2017
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Re: Astro Photos

But I thought you have a goto mount Dave

Great star image though.

10 min exposures is a long time without narrowband filters so what ISO were you using and what is the effective aperture of your 550mm telescope lens?

I have found that if I stop down with zuiko lenses I can get the star burst effect and assume its because when stopped down the blades of the iris contribute.
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