[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!