[Shiraz (Ray)]

Originally Posted by tilbrook@rbe.ne

Gob smacked Ray!!

So that's how the big boys do it.

Another I tried myself sometime ago.
http://www.iceinspace.com.au/forum/a...e.php?a=137424

Not even in the same ball park as yours.

Cheers,

Justin.

Thanks Justin. jolly dim region eh?

Originally Posted by marc4darkskies

Lovely Ray! Nice composition, great colour & good detail. Pretty darned good in fact for only 200 & 300 sec Lum subs! It certainly is a spectacular group!

I have to say though that the watermark smack bang in the middle spoils it for me a bit.

Also, what causes the dark "X" shaped artifact on stars?

Cheers, Marcus

Thanks Marcus. Short subs are all that are needed with the low read noise and high QE of the camera - I have used longer subs, but get no extra SNR - just lose dynamic range. The crosses are a diffraction effect from the focuser draw tube intruding into the light column. I will have to shorten the OTA, but have been putting off cutting that beautiful CF until I am certain that the scope is a keeper - probably should do it soon. The watermark appeared when I used the uploader defaults on first use of the site - haven't yet worked out how to remove it, but agree that it is a pain.

Originally Posted by RickS

That's a great FOV, Ray, and you've done a lovely job on it. With short subs and a low noise camera too

thanks Rick. It needs more time - I will probably have to choose brighter targets in future

Originally Posted by Stevec35

That's extremely nice Ray! I would be well pleased with it.


Cheers

Steve

Thanks very much Steve. I am pleased with it, but it could do with somewhat fewer artefacts at full scale....