Gave this one a bit of a dust-off, tidied up the noise a tad,
and upped the image scale from the earlier version, so I guess you'd call my picture of this rarely imaged galaxy a re-pro with extras.
A focal reducer was used to deliver a paltry focal length of around 2500mm
The LRGB data was captured at 1:1 binning with 9 micron pixels.... sheer sampling madness, I know, but, someone's got to do it.
Bam! Right there is what 2500mm does for galaxies then -
Looks a tad magenta on my screen though.
Amazing detail Peter - it's like you could reach out & touch it ....
Bam! Right there is what 2500mm does for galaxies then -
Looks a tad magenta on my screen though.
Amazing detail Peter - it's like you could reach out & touch it ....
Bam! ?
Yep. I like that
Sorry, I was using an uncalibrated monitor...colour should be fixed now.
This was also taken about 100m above seal level in the 'burbs of Sydney.
No Chilean mountain dust was disturbed or injured during the image capture process
Very nice Peter. Uh oh a focal reducer. They can be fun given how much quicker you get the data. Sometimes there can be a cost though.
With a Planewave the cost is no backfocus for any guiding. In your case fatter stars than the original data?
A bit of an issue with star registration or perhaps CA from the reducer?
I never know what to expect on the colour of this one as examples vary wildly. I wonder what the new colour calibration tool in PI would show.
What is impressive still is the detail and what appears to be almost differentiated stars in the outer belts. They almost seem to be resolving into single stars.
Peter we are going to have to shoot you very soon, how can one compete, that is just awesome, well done just doesn't cover it.
Leon
Well, not sure about the shooting part, but thanks very much Leon. I take it
the image is a keeper
Quote:
Originally Posted by gregbradley
Very nice Peter. Uh oh a focal reducer. They can be fun given how much quicker you get the data. Sometimes there can be a cost though.
With a Planewave the cost is no backfocus for any guiding. In your case fatter stars than the original data?
A bit of an issue with star registration or perhaps CA from the reducer?
I never know what to expect on the colour of this one as examples vary wildly. I wonder what the new colour calibration tool in PI would show.
What is impressive still is the detail and what appears to be almost differentiated stars in the outer belts. They almost seem to be resolving into single stars.
Greg.
Thanks Greg.
The reducer if anything makes the stars a tad tighter, there is absolutely no CA.... but I hear you when to comes to back-focus!
I had to get second cover-plate for the CFW adapted solely for the reducer.
Yes there is some fringing around the stars, but purely due the seeing varying during the exposure sequence.
I guess I could have "fuzzed" it out, but didn't want to lose the snap...or as Andy aptly said "Bam!" in the data
I rather like the structure in faint fuzzies at 2 o'clock. Faint.... but beautifully resolved by this instrument.
The reducer if anything makes the stars a tad tighter, there is absolutely no CA.... but I hear you when to comes to back-focus!
I had to get second cover-plate for the CFW adapted solely for the reducer.
Yes there is some fringing around the stars, but purely due the seeing varying during the exposure sequence.
I guess I could have "fuzzed" it out, but didn't want to lose the snap...or as Andy aptly said "Bam!" in the data
I rather like the structure in faint fuzzies at 2 o'clock. Faint.... but beautifully resolved by this instrument.[/QUOTE]
You can always do some decon on the subs that are enlarged. That has a certain workability.
I quite liked imaging with the reducer apart from in my case having to slum it and use a guide scope. Something like the outer parts of the Helix in 2x2 binning is about 4 hours worth of exposure. You should have a lot of fun with it as its obviously top of the line optics.
Peter, what's going on around the outside edges of the galaxy? Maybe it's my cheap monitor but it looks really grainy. There also seems to be a wide blue horizontal line through the right hand side of the image and a remnant of a satellite trail through the left hand bottom section. Perhaps it's just me but it doesn't seem to be as good as what I've seen you produce before?
Peter, what's going on around the outside edges of the galaxy? Maybe it's my cheap monitor but it looks really grainy. There also seems to be a wide blue horizontal line through the right hand side of the image and a remnant of a satellite trail through the left hand bottom section. Perhaps it's just me but it doesn't seem to be as good as what I've seen you produce before?
Nice detail in the galaxy though
Peter
Edge artifacts are probably due the fact I selectively reduced the noise.
There is indeed a satellite trail! ...but I decided it was faint enough on my (calibrated) monitor not to bother with.
[QUOTE=Peter Ward;1335596]Edge artifacts are probably due the fact I selectively reduced the noise.
There is indeed a satellite trail! ...but I decided it was faint enough on my (calibrated) monitor not to bother with.
Yep, calibrated monitors are becoming quite main stream these days. Here's a screen grab from mine. As I said in my original post, it's a nice image but I've seen you do better.
The fine detail that you've captured is exquisite! Still not sure about the colour but the luminance is excellent.
Quote:
Originally Posted by peter_4059
Yep, calibrated monitors are becoming quite main stream these days. Here's a screen grab from mine. As I said in my original post, it's a nice image but I've seen you do better.
Well... the satellite trail stays...it can be my version of a watermark
As for the colour..I have tweaked it a tad more, but given I image from light-pollution central, I suspect with all the gradient removal required I'm chasing my tail here and am making subjective changes that are probably not valid.
Sigh...Moving to a dark site would make imaging such a breeze...
Quote:
Originally Posted by alpal
Nice & sharp Peter,
The images on this site are just getting better & better
just when we thought that there was no room for improvement.
what a fantastic cruddy image !!! whinge, whine and complain I can only hope that one day i get the change to get something like this. Fantastic details and i certainly appreciate the resolution.
Yep. I like that 
that is just awesome, well done just doesn't cover it. 
