Recent Posts

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21
Astrophotography / Re: Saturn
« Last post by NoelC on Yesterday at 12:05:10 »
Well done!
Looks quite good.
I tried and failed.

Noel
22
Astrophotography / Re: M33 Triangulum
« Last post by MarkS on Yesterday at 09:30:18 »
Quote from: Apophis
Thanks Mark , maybe my DSLR swan song as hoping to step up to CCD Mono imaging soon.

Are you planning to do some narrowband imaging?  Otherwise I can't see much point in mono sensors. However I will admit that my opinion on this is somewhat controversial - the debate on LRGB vs RGB imaging is certainly an interesting one  ;)

Mark
23
Astrophotography / Quick Cocoon IC5146
« Last post by MarkS on Yesterday at 08:22:29 »
Here's a quick test image I took on Wednesday night.  It's the Cocoon Nebula taken on Wednesday evening using my new Starizona LF corrector on the Celestron C11 - the LF means "Large Format".  It's the only SCT corrector that covers the sensor of a full frame camera.  As always, I was using the (full frame) H-alpha modified Sony A7S.

This is only 70minutes of exposure taken in 30sec subs at ISO 10000.  The other 90minutes of data was unusable because of the passing clouds.

I've cropped the image because the stars go quite squiffy on the right hand side - I still have some adjustments to make to the collimation and sensor spacing but the nights are not yet long enough.



If you really want to see the squiffy stars, the full version is here:
http://www.markshelley.co.uk/Astronomy/2018/Cocoon20180718_full.jpg

Apparently the alignment of this corrector is quite critical and I'm obviously not quite there yet :)

Mark
24
Astrophotography / Re: M33 Triangulum
« Last post by Apophis on Jul 19, 2018, 23:48:38 »
Thanks Mark , maybe my DSLR swan song as hoping to step up to CCD Mono imaging soon.
Roger
25
Astrophotography / Re: M33 Galaxy
« Last post by Carole on Jul 19, 2018, 08:55:56 »
Had one more try almost replacing the Red channel with Ha.  But then this destroyed the star colours, so then pasted the original image over the top and blended as lighten.

Must write my own tutorial on this before I forget what I did.

Have added the image into the first post for comparison.

Carole
26
Astrophotography / Re: M33 Galaxy
« Last post by Carole on Jul 19, 2018, 08:07:43 »
Thanks Mark.  I have been scouring the internet for the Ha addition and I see I posted a question on Astrobin about this issue some time ago and got a few replies, but none of them come up with any better solutions than what i am already doing and that is to combine the Ha into the Red channel.

I found I got a better result (3rd try yesterday) by combining the Ha to the red channel and blending it about 60% and blend lighten, but still I am not getting the results that I see on some forum posts.  The next time I see a good result I am going to contact the poster and ask how they did it.

I also tried in the past putting the coloured image over the Ha image (changing the mono Ha to RGB) and blending the two in one of the blend modes and increasing the Ha in the red channel, but that didn't work this time.   So am currently stumped and frustrated.

Carole
27
Astrophotography / Re: Saturn
« Last post by The Thing on Jul 19, 2018, 07:25:01 »
Thanks Carole, itvwould be nice if it were sharper. If I reduce the graininess then the small amount of feature detail goes too since the noise reduction is essentially smoothing.
28
Astrophotography / Re: M33 Galaxy
« Last post by MarkS on Jul 18, 2018, 22:53:23 »
A very nice result!  It's not easy to get those outer faint arms.

M33 is one of my favourite galaxies and is on my list for later in the Summer with my C11 and Sony A7S combo.

Sorry, I don't know the best way of combining H-alpha and the red channel.

Mark
29
Astrophotography / M33 Galaxy
« Last post by Carole on Jul 18, 2018, 20:38:25 »
This is my last one from July DSC (thank goodness you all say!)  :lol:

Dual Rig:
Mount: HEQ5
WOZS71/Atik314L + FR x 0.8 : 13 x 600 + 4 x 900 Luminance
SWED80/Atik460EX + FR x 0.8 : RGB:
Blue & Green 5 x 150 secs + 4 x 200 secs binned x 2
Red: 5 x 150 secs + 7 x 200secs Binned x 2
Ha 5 x 10min

Does any-one know a good tutorial on how to add Ha to get red high lights in Photoshop?
Have tried all sorts of ways, including adding to the red channel? Thanks.


Total Luminance 3h 10m
Total RGB 1h 27.5m
Total Ha 50m

Grand total = 5 hours 27minutes
Taken over 2 nights



With Ha highlights added (finally)
30
Astrophotography / Re: Cocoon Nebula full frame and Crop
« Last post by Carole on Jul 18, 2018, 20:36:03 »
Thanks Hugh, I like both views.

Carole
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