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Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: RobertM on May 25, 2015, 22:47:19

Title: North America widefield
Post by: RobertM on May 25, 2015, 22:47:19
This is a single frame from my holiday, unfortunately the clouds rolled in and this is as far as I got with this one.

Sony A7s, RH200 30s@ISO2000, no darks, flats or bias, all processing in PI.

(https://farm8.staticflickr.com/7770/18070297536_287348cd27_b.jpg)

Warts here: https://farm8.staticflickr.com/7770/18070297536_afb213506d_o.jpg (https://farm8.staticflickr.com/7770/18070297536_afb213506d_o.jpg)
Yes there was quite a bit of NR.
Title: Re: North America widefield
Post by: Kenny on May 25, 2015, 23:00:24
Brilliant image Robert.

Quote from: RobertM on May 25, 2015, 22:47:19
Warts here: https://farm8.staticflickr.com/7770/18070297536_afb213506d_o.jpg (https://farm8.staticflickr.com/7770/18070297536_afb213506d_o.jpg)
Yes there was quite a bit of NR.

I don't see any warts.
Title: Re: North America widefield
Post by: RobertM on May 26, 2015, 06:57:29
That's very kind Kenny but there is so much wrong with it.  I posted more as an example of what the can be achieved with a single short sub plus I was trying different techniques in Pixinsight.  I would not normally post these but I was surprised how much information there was.
Title: Re: North America widefield
Post by: JohnP on May 26, 2015, 08:19:13
what was the lens?
Title: Re: North America widefield
Post by: RobertM on May 26, 2015, 09:15:18
Quote from: JohnP on May 26, 2015, 08:19:13
what was the lens?

It was a 600mm f/l f/3 telescope.
Title: Re: North America widefield
Post by: MarkS on May 26, 2015, 13:05:59
Single frame?!?!  :o

Wow. I'm really looking forward to trying this myself with the A7S!

Mark
Title: Re: North America widefield
Post by: RobertM on May 26, 2015, 16:05:00
Quote from: MarkS on May 26, 2015, 13:05:59
Single frame?!?!  :o

Yes single frame with the target 30-40 degrees above the horizon.  I'll post other shots as they are processed.
Title: Re: North America widefield
Post by: Fay on May 26, 2015, 17:16:47
well that looks good Robert!!
Title: Re: North America widefield
Post by: RobertM on May 26, 2015, 17:19:54
Thank you Fay
Title: Re: North America widefield
Post by: Carole on May 26, 2015, 18:00:13
Amazing for a single 30sec sub and I presume unmodded. 

Carole
Title: Re: North America widefield
Post by: RobertM on May 26, 2015, 21:42:55
It sure would be amazing if it was unmodded but alas it was modded (all filters removed).
Title: Re: North America widefield
Post by: Carole on May 26, 2015, 22:19:15
Ah, was just going by the colour.

Carole
Title: Re: North America widefield
Post by: RobertM on May 27, 2015, 07:26:50
Anything in particular about the colour ?
Title: Re: North America widefield
Post by: Carole on May 27, 2015, 07:54:36
It looked like the pale colour of the unmodded DSLR images I have seen that's all.

Carole
Title: Re: North America widefield
Post by: RobertM on May 27, 2015, 09:14:52
That's my naive attempt at processing.  My DSLR workflow is giving me a lot of trouble - something I'm still getting to grips with in PixInsight.
Title: Re: North America widefield
Post by: Fay on May 27, 2015, 09:38:30
How long an exposure would you have to do with a 7.5 scope to get same result, Robert?
Title: Re: North America widefield
Post by: RobertM on May 27, 2015, 13:44:50
Something like about 7 times but you would need extremely well corrected optics to make full use of the sensor size.
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