NGC1365 Southern Spiral Galaxy CDK17 F4.5 12 hours

gregbradley · #1 09-12-2013, 10:18 PM

I've got the reducer setup working on my CDK17 so it now is working at F4.5 with the Trius 694.

NGC1365 is the famous southern barred spiral galaxy.

Just under 12 hours.

http://upload.pbase.com/gregbradley/...53645565/large regular size

http://upload.pbase.com/gregbradley/...45565/original large size

Greg.

Stevec35 (Steve) · #2 09-12-2013, 10:23 PM

That's a very good NGC1365 Greg.

Cheers

Steve

batema (Mark) · #3 09-12-2013, 10:25 PM

Beautiful

RobF (Rob) · #4 09-12-2013, 10:27 PM

Fantastic work Greg. You're really getting value from the CDK right now with images like this and the HH. Its wonderful you've shown the full image. Looks like a final rendition something between the regular and large size might be kinder to the fine detail.

Heck, when you can see background galaxies that clearly, what am I going on about!

dutch2 (Ingrid) · #5 09-12-2013, 10:28 PM

Wonderful shot, what a great image!
Well done.

pmrid (Peter) · #6 09-12-2013, 10:31 PM

Greg, that's a great image. I am envious of the subtle hand shown in the processing. It is an image to remember.
Peter

h0ughy (David) · #7 09-12-2013, 10:39 PM

nice scale and composition Greg

strongmanmike (Michael) · #8 09-12-2013, 11:15 PM

Yeah excellent Greg

the large (original) version shrunk to 50% on the screen looks awesome... at full size though there are a few harsh processing warts...better to keep the viewer at a bit of a distance

A grand galaxy image that....go Starlightxpress

Oh and easily your best galaxy image so far with the CDK17

Mike

allan gould · #9 09-12-2013, 11:40 PM

Oooooh, one of my favouritist-um galaxies. Done to perfection.
The Trius is really holding its own.
Allan

gregbradley · #10 10-12-2013, 12:53 AM

Quote:

Originally Posted by Stevec35

That's a very good NGC1365 Greg.

Cheers

Steve

Cheers Steve.

Quote:

Originally Posted by batema

Beautiful

Thanks for that.

Quote:

Originally Posted by RobF

Fantastic work Greg. You're really getting value from the CDK right now with images like this and the HH. Its wonderful you've shown the full image. Looks like a final rendition something between the regular and large size might be kinder to the fine detail.

Heck, when you can see background galaxies that clearly, what am I going on about!

Thanks Rob. It can take a while to extract the best out of your gear. Various combinations, different processing approaches.

Quote:

Originally Posted by dutch2

Wonderful shot, what a great image!
Well done.

Thanks Ingrid.

Quote:

Originally Posted by pmrid

Greg, that's a great image. I am envious of the subtle hand shown in the processing. It is an image to remember.
Peter

Thanks Peter. I do try to keep it invisible. Not always successful but certainly a standard I apply to my processing.

Quote:

Originally Posted by h0ughy

nice scale and composition Greg

Thanks Dave. I think I'll add more to this one it seems to be worth extra effort.

Quote:

Originally Posted by strongmanmike

Yeah excellent Greg

the large (original) version shrunk to 50% on the screen looks awesome... at full size though there are a few harsh processing warts...better to keep the viewer at a bit of a distance

A grand galaxy image that....go Starlightxpress

Oh and easily your best galaxy image so far with the CDK17

Mike

Thanks Mike. No doubt some subtle repro is on the cards! I had earlier versions that were better in some ways and worse in others. I should be able to get them all together.

Quote:

Originally Posted by allan gould

Oooooh, one of my favouritist-um galaxies. Done to perfection.
The Trius is really holding its own.
Allan

Thanks Allan. Its an unsual and striking looking galaxy and quite bright too which is handy. I've been imaging a lot of the fainter ones lately.

Greg.

RickS (Rick) · #11 10-12-2013, 08:32 AM

A very nice rendition of NGC 1365, Greg!

I have one night of data on this target myself. It will be interesting to compare how much I got in a shorter time with smaller aperture and a less sensitive camera.

Cheers,
Rick.

TimberLand (Justin) · #12 10-12-2013, 10:15 AM

Fantastic shot, and a hand full of background galaxies because you can.

Great combination with your setup. Looks like it is working well. But I bet you know of a few issues that need to be tweaked, I can't see them in the photo though.

Justin.

alpal · #13 10-12-2013, 10:27 AM

Hi Greg,
A superb shot.
It results like that which make this hobby worthwhile.

cheers
Allan

gregbradley · #14 10-12-2013, 07:13 PM

Quote:

Originally Posted by RickS

A very nice rendition of NGC 1365, Greg!

I have one night of data on this target myself. It will be interesting to compare how much I got in a shorter time with smaller aperture and a less sensitive camera.

Cheers,
Rick.

Thanks Rick. Yes it would make an interesting comparison. The Trius is less oversampled with the reducer but still not 100% ideal match.

I intend acquiring more data for this one as some images work out better than others and this one is the best of my recent images so its worth adding to it. I'll try and get another 9 to 10 hours worth.

Quote:

Originally Posted by TimberLand

Fantastic shot, and a hand full of background galaxies because you can.

Great combination with your setup. Looks like it is working well. But I bet you know of a few issues that need to be tweaked, I can't see them in the photo though.

Justin.

Yes you can always tweak your gear. Its rarely a static hobby.
No real issues with this setup at the moment although I would prefer an AO and an OAG to guarantee perfect tracking and tighter stars.
I also have to watch the stars when processing from this camera. They easily get a slight fuzz around them which can be accentuated by enriching colour processing so star masking correctly done becomes important.

Quote:

Originally Posted by alpal

Hi Greg,
A superb shot.
It results like that which make this hobby worthwhile.

cheers
Allan

Thanks Allan. That's a nice compliment. But its true. Every now and then one image just really works and it makes up for the ones not 100%.

Greg.

Shiraz (Ray) · #15 10-12-2013, 07:15 PM

what a ripper of an image - well done Greg.

gregbradley · #16 10-12-2013, 07:18 PM

Quote:

Originally Posted by Shiraz

what a ripper of an image - well done Greg.

Thanks Ray. I plan to add another 10 hours.

Greg.

Bassnut (Fred) · #17 10-12-2013, 07:34 PM

Yes, lots of detail there, excellent !.

marc4darkskies (Marcus) · #18 10-12-2013, 08:16 PM

Lovely Greg!! The detail is excellent - more data will smooth it out. Very nice indeed!

That's some image scale ... 0.48 arcsec/pixel! But why did you reduce from the native CDK17's 0.63 as/p? Your sub length would need to be marginally longer at this scale than at your native F6.8 with 9 micron pixels, even considering the high QE of the SX694.

Cheers, Marcus

gregbradley · #19 10-12-2013, 08:36 PM

Quote:

Originally Posted by Bassnut

Yes, lots of detail there, excellent !.

Cheers Fred.

Quote:

Originally Posted by marc4darkskies

Lovely Greg!! The detail is excellent - more data will smooth it out. Very nice indeed!

That's some image scale ... 0.48 arcsec/pixel! But why did you reduce from the native CDK17's 0.63 as/p? Your sub length would need to be marginally longer at this scale than at your native F6.8 with 9 micron pixels, even considering the high QE of the SX694.

Cheers, Marcus

Native the Trius is .32 with the reducer as you say .48 and the 9 micron 16803 is .63 and .96 with the reducer. The KAF8300 chip is native .38 and with the reducer .57. Oversampling has some advantages. One is deconvolution works better than at 9 microns. This tends to reduce the need for an AO to some degree (of course primary tight data is always senior). Greater image scale. Also the camera has lower read noise at 6 electrons versus about 12 for the 16803 so SNR tends to be higher. There is a gain, how much I let the images be the judge. Some seem better. Others are OK. I think the reducer improves the sampling a lot better. I also got the camera for my TEC180 as its perfect sampling for that scope which is handy as its also portable and I can take it to my dark site. Its also a bit less of a wind prone scope.

Additionally 2x2 binning works well with this camera as Ray has tested binning is working near theoretical levels. The KAF8300 camera also works well with the reducer and I have taken some good Ha shots with that camera in the past. I seem to be picking up more detail and I still need to gather about 10-20 hours for an ideal image so no real shortcuts there. In Ha and O111 this camera is top of the list as both are around 66% and 60% respectively. That is very high. Small wells are a consideration so I keep an eye out for bright star bleed. Also 17 inches at F4.5 and 77% QE actually burns out the core of galaxy NGC1097 in a 10 minute sub! So a lot of photons being recorded.

I am also thinking of either a 09000 chipped 12 micon camera or a 6303e 9 micron pixel camera. Mainly because I have never used a 6303e and its a largish sensor and large wells and good QE. Blooming I hope is a matter of controlling sub length or CCDstack bloom removal.

Greg.

Ross G · #20 12-12-2013, 10:03 AM

A beautiful galaxy photo Greg.

Closeup with great colour and detail.

Love it!

Ross.