NGC4945 slightly more frames

[kinetic]

Hi,

this result from tonight.
More frames compared to my Mar 17 result. (http://www.iceinspace.com.au/forum/showthread.php?t=42498)
Tonight's stack was 159 frames.
Also, let the RA drift a bit and captured some
frames of NGC 4976.

4945 again looks ok right now on the dome CRT but I suspect it's
noisy on an LCD monitor.
Lots more frames needed to drop the noise floor.

Steve

[JD2439975]

Hey that's looking much better Steve.

Getting some nice structure appearing now.

[Quark]

Definitely better Steve,
You have some nice structure in 4945 and the more signal you get the smoother it is going to be.

Trevor

[kinetic]

Hi,

thanks guys,
Tonight I tried a combine of the Mar 17 frames and
the Mar 22 frames.
The combination brings back the dark frame artifact but
waters it's effect down a bit.

I also discovered that saving a JPEG with ZERO compression and
keeping a crop just below 200kB, I get rid of a lot of the noise.
Der!...:screwy:

It's obvious that even saved as a 5% compression JPEG contributes
a lot to the noise. Funny how such an obvious thing right at the end
of a large processing routine can trip me up! :)

Steve

[spearo]

well done
focus might be a very slight bit out? Using a Bhatinov mask?
frank

[JD2439975]

Very noticable difference to noise in that last image, way less.
And that's with only 5% compression!! must remember that for future reference.

So Steve, any plans to put colour filters in that DSI ?

A Bahtinov mask yes...must make myself one of those.

[Garyh]

Lookin good Steve! Getting images nice under 200k can be a challenge ex with lots of stars or background noise.
Now some color :)