Bunyip looks at R Corona Australis

[David Fitz-Henr]

Originally Posted by dvj

Wow, stunning. That little spiral galaxy tops it off nicely. Color will be amazing, but this grayscale is a thing of beauty.
Congrats,

j

Thanks John.

Originally Posted by Octane

H

Thanks also Humayun!

Originally Posted by ourkind

Stunning! Add that to my list of wallpapers!

Thanks Carlos!

Originally Posted by strongmanmike

Yeh, that's pretty incredible...the colour version should be a corker!

Clearly a great scope but the seeing looks like it was indeed excellent.

Perfect evidence that when constructed and tweeked right it is hard to beat a good Newtonian.

Mike

Thanks Mike; yes, hoping to complete the colour soon or may need to wait till next season. Yep, I've always had a fondness for the simple Newtonian!

Originally Posted by Larryp

Magnificent!

Thanks Laurie!

Originally Posted by Lester

Very nice detailed sharp image David. Looking forward to the colour version. All the best.

Thanks Lester - me too!

Originally Posted by multiweb

Keep coming back to this shot. I'm floored. The details in the highres are truly outstanding. Never seen before.

Thanks again Marc! I've shown this whole thread to my wife as it helps me now justify two years of weekends building it (and neglecting the house ... well, priorities right!)

Originally Posted by bratislav

I didn't even know there are so many galaxies in this area! Epic detail!

Bratislav

Thanks Bratislav!

Originally Posted by strongmanmike

I'm with you on this Marc...fantastic Lum David

Mike

Thanks again Mike ... now I just gotta make sure I don't botch the colour version ....

Originally Posted by MrB

Absolutely Sublime.
A truly inspiring image.

Thanks Simon!

[Ross G]

What an amazing photo David.

The detail is fantatstic.

Ross.

[strongmanmike (Michael)]

Originally Posted by David Fitz-Henr

Thanks again Mike ... now I just gotta make sure I don't botch the colour version ....

Yes, will be a challenge...but I have faith in you

Mike

[David Fitz-Henr]

Originally Posted by Ross G

What an amazing photo David.

The detail is fantatstic.

Ross.

Thanks Ross - very happy with the scope so far!

Originally Posted by strongmanmike

Yes, will be a challenge...but I have faith in you

Mike

Heh, heh - thanks Mike ... I think ...
It's clear today so I'm going to try for the green data tonight (and hope that the brightness now of R Corona Australis matches the red & blue data I already have) - the rest of the week looks iffy according to the weather forecasts.

[iceman (Mike)]

Wow, I really enjoyed this image!
Stunning and so sharp!

I can't wait for the colour verison.

This is now IOTW.

[SkyViking (Rolf)]

That's simply fantastic, amazing detail and those background galaxies really pop.
What's the resolution with your setup? STL-11000 with 12.5" f/5 gives around 1.16"/pixel, is that about right?

[SouthPoll (Dallas)]

I could look for hours and still not find all the galaxies in this image.......awesome

[alpal]

Hi David,
Amazing tight stars across the whole frame -
what coma corrector are you using?

[multiweb (Marc)]

Congrats on IOTW mate. One of many to come.

[Greg Bock (Greg Bock)]

wow, the detail is astonishing....Congrats on a great image David.

[stardust steve (Steve)]

another image i got lost in!
Congrats for IOTW

[MrB (Simon)]

Congratulations on the IOTW David, very deserved.

Originally Posted by alpal

Hi David,
Amazing tight stars across the whole frame -
what coma corrector are you using?

3" Keller corrector from ASA.
http://www.iceinspace.com.au/forum/s...ad.php?t=64882

[alpal]

Originally Posted by MrB

3" Keller corrector from ASA.
http://www.iceinspace.com.au/forum/s...ad.php?t=64882

Thanks Simon,
That explains it - a superb corrector:
http://www.optcorp.com/product.aspx?pid=11488

& even though the short back focus of 57mm would most likely preclude an OAG
being used the separate guide scope seems to have no flexure.

That is a really nice result with 15 minute subframes.

[whzzz28 (Nathan)]

Looks amazing.

Sadly once you see that satellite trail, you can't unsee it

[Stevec35 (Steve)]

I'm late in commenting but that's downright excellent!

Cheers

Steve

[David Fitz-Henr]

Originally Posted by iceman

Wow, I really enjoyed this image!
Stunning and so sharp!

I can't wait for the colour verison.

This is now IOTW.

Thanks very much for that Mike! I'm still trying to get the colour data, but the weather is not co-operating ...

Originally Posted by SkyViking

That's simply fantastic, amazing detail and those background galaxies really pop.
What's the resolution with your setup? STL-11000 with 12.5" f/5 gives around 1.16"/pixel, is that about right?

Thanks Rolf! The native focal length is 1605mm which puts the f/ratio at about f/5.05. However, the corrector has a reduction factor of 0.95x so the effective focal ratio is around f/4.8, giving 1.22 arcsecs/pixel.

Originally Posted by SouthPoll

I could look for hours and still not find all the galaxies in this image.......awesome

Thanks Dallas!

Originally Posted by alpal

Hi David,
Amazing tight stars across the whole frame -
what coma corrector are you using?

Thanks, as per Simon's reply below, a 3" Keller corrector.

Originally Posted by multiweb

Congrats on IOTW mate. One of many to come.

Thanks mate!

Originally Posted by Greg Bock

wow, the detail is astonishing....Congrats on a great image David.

Thanks Greg!

Originally Posted by stardust steve

another image i got lost in!
Congrats for IOTW

And thanks Steve!

Originally Posted by MrB

Congratulations on the IOTW David, very deserved.


3" Keller corrector from ASA.
http://www.iceinspace.com.au/forum/s...ad.php?t=64882

Thanks Simon! Yes, that's the corrector I used.

Originally Posted by alpal

Thanks Simon,
That explains it - a superb corrector:
http://www.optcorp.com/product.aspx?pid=11488

& even though the short back focus of 57mm would most likely preclude an OAG
being used the separate guide scope seems to have no flexure.

That is a really nice result with 15 minute subframes.

Thanks Alpal - but actually I used the inbuilt guider chip in the STL-11000M for this. I'm still tweaking the scope to facilitate the use of the guidescope for at least the RGB frames, but it is quite challenging to maintain pixel level consistency between the two optical systems. I did do a test the other evening in which I used the guidescope for a 20min sub with no star elongation which is encouraging, but I need to try different declination / elevations, etc before I can say how true that is across the sky.

Originally Posted by whzzz28

Looks amazing.

Sadly once you see that satellite trail, you can't unsee it

Thanks Nathan! But actually, that's not a satellite trail (in the upper right) - it's a diffraction spike from a bright star that is just off the image frame. Any such satellite / meteor trails have been removed in the stacking / data rejection process (in CCDSTack - there were a couple of meteors in the raw frames). One hint - look at the orientation of the spike; it lines up with the other star spikes in the image.

Originally Posted by Stevec35

I'm late in commenting but that's downright excellent!

Cheers

Steve

... and thanks Steve!

[alpal]

David,

Thanks Alpal - but actually I used the inbuilt guider chip in the STL-11000M for this. I'm still tweaking the scope to facilitate the use of the guidescope for at least the RGB frames, but it is quite challenging to maintain pixel level consistency between the two optical systems. I did do a test the other evening in which I used the guidescope for a 20min sub with no star elongation which is encouraging, but I need to try different declination / elevations, etc before I can say how true that is across the sky.

Hi David,
Thanks for the update -
I could only find mention in your article about a guide scope.
Good luck with different parts of the sky.
From a quick read of the article it looks like you've
sorted out any flexure - it is possible to do.
When I tried with my older setup without an OAG
I wasn't getting consistent subframes & one night had to delete half of them.
I found that pointing North was great but anywhere South was bad.
My TS9 OAG was short enough to solve the problem with it's short 9mm back focus.

I am looking forward to some colour images from your system
- they should be real eye candy.

cheers
Allan

[David Fitz-Henr]

Originally Posted by alpal

Hi David,
Thanks for the update -
I could only find mention in your article about a guide scope.
Good luck with different parts of the sky.
From a quick read of the article it looks like you've
sorted out any flexure - it is possible to do.
When I tried with my older setup without an OAG
I wasn't getting consistent subframes & one night had to delete half of them.
I found that pointing North was great but anywhere South was bad.
My TS9 OAG was short enough to solve the problem with it's short 9mm back focus.

I am looking forward to some colour images from your system
- they should be real eye candy.

cheers
Allan

Thanks Allan. I had mentioned the guidescope in my DIY post as it is one of the things I had been concentrating on; however I use the guide chip where possible as it guarantees consistency.
Alas, the clouds have been plaguing me this week ...

[Paul Haese]

Goes to show what resolving power does for gathering detail. Very nice smooth data and great 3D detail in the dust clouds. Awesome luminence.

[Jo41 (Jo)]

looks great and so does yr observatory.