DMK Jupiter - Brisbane - May 6

matt · #1 06-05-2008, 02:52 PM

Conditions a little worse than 24 hours before, but still some useful data and am happy to be getting more practice with RGB imaging and the DMK mono camera.

I think the colour balance in this one is better than my effort of yesterday morning?

Sadly the transparency let me down, with lots of dew and thin high cloud.

I also had a go with the 3x barlow, just to see how it performed and combined, these factors forced me to shoot at 1/15 exp and 15fps to get a reasonably full histogram. Unfortunately, the same factors saw a reduction in the number of overall frames to work with and I ended up stacking only 200 frames in each channel. Hence the pic is a little grainer as a result of wavelet processing.

GRS is just rising, and I like the cloud detail in the SEB.

Cheers.

davidpretorius · #2 06-05-2008, 07:15 PM

great to see the RGB up and running.

yes, i was in the same boat trying to get some BIG scale, but 15fps was the result.

I am now resigned to the fact that a 10" mirror stops at f40 odd @ 30fps for the histogram to be fullish.

I just need a bigger mirror

What filters did you end up getting?

matt · #3 06-05-2008, 08:18 PM

Hi David.

Am using the Astronomik Type 2 filters.

They seem pretty good, although not parfocal. Which is a little disappointing, since the advertising blurb makes that claim.

Anyway...they are pretty close, and the light throughput seems good. They also have a built-in IR block.

Cheers.

John K · #4 06-05-2008, 08:33 PM

nice going Matt, good to see you working your set up.

davidpretorius · #5 06-05-2008, 08:56 PM

thanks Matt, i think for the big focal lengths, it would be hard to get the focus just right for all filters.

Bird is getting some new ones I think and compare them to the astromiks

edwardsdj (Doug) · #6 07-05-2008, 01:36 AM

Another very nice Jupiter Matt

Colour looks very natural to me.

Robert_T · #7 08-05-2008, 08:00 AM

Hi Matt - nice natural colouring for an RGB jobby, well done.

For the grain I wonder if you shouldn't try just ignoring the histogram and going with what looks just enough to see reasonable detail on the screen. That's what I do, but mainly because I can't work/understand the histo feature in IC capture

I remember Bird saying he doesn't try and fill the histogram either so maybe there's something in it.

cheers,

Rob

matt · #8 08-05-2008, 10:37 AM

Hi Rob.

Hmmm.

Definitely two schools of thought here re: the histogram.

I'll give your suggestion a try. I'm keen to experiment with this cam and RGB processing.

I wasn't aware of Anthony's position on the histogram. Perhaps he'll see this thread and comment on the point you have raised?

Thanks, mate.

Quote:

Originally Posted by Robert_T

Hi Matt - nice natural colouring for an RGB jobby, well done.

For the grain I wonder if you shouldn't try just ignoring the histogram and going with what looks just enough to see reasonable detail on the screen. That's what I do, but mainly because I can't work/understand the histo feature in IC capture

I remember Bird saying he doesn't try and fill the histogram either so maybe there's something in it.

cheers,

Rob

AlexN · #9 08-05-2008, 11:56 AM

nice shot!

What time was that taken? 10 - 11ish? I got out and captured it around 12:30 and GRS was almost smack bang in the centre!

good amount of detail in your image and nice colors!

matt · #10 08-05-2008, 12:12 PM

Hi Alex.

It was around 3.20am.

I'll just check with AstroCalc....and yes...that's about right for the morning of the 6th.