Lioness of Ara

Peter Ward · #1 29-05-2022, 11:25 PM

Adding RGB stars to this NB vista was something of a challenge. That said the O-association stars are nicely resolved, something not seen too often
with other examples on the web.

The link is here

The h-alpha data was plagued by the dreaded CMOS banding which I finally resolved in OIII and SII runs by bumping up the gain and lowering the USB traffic figure. As to whether I'll do another Ha run? ...meh...maybe

Pilgrim (Igor) · #2 30-05-2022, 12:03 AM

Fantastic! Very impressively deep looking image, cute tiny stars and fine processing.

Startrek (Martin) · #3 30-05-2022, 07:53 AM

Peter,
Lovely image
Just about as good as it gets
I see your not a fan of CMOS cameras but obviously starting to work them out with excellent results
Well done !
Martin

alpal · #4 30-05-2022, 09:27 AM

Hi Peter,
that's a magnificent picture.
Thanks for sharing.

cheers
Allan

JA · #5 30-05-2022, 09:47 AM

Excellent Stuff ....

The tiny stars and detail/contrast really help create a wonderful sense of depth/ 3D impression!

Best
JA

Dave882 (David) · #6 30-05-2022, 10:08 AM

Wow and other stunning shot! I agree with JA it’s definitely got a very 3d appearance to it. Beautiful!!

Stephane · #7 30-05-2022, 10:28 AM

Peter, this image is just sensational (as are your others). May I ask what exposure time you use for your SHO subs, and what your exposure for your stars are?

Many thanks,
Stéphane

PKay (Peter) · #8 30-05-2022, 11:25 AM

As good as it gets Peter.

Very well done

Peter Ward · #9 30-05-2022, 11:28 AM

Quote:

Originally Posted by Pilgrim

Fantastic! Very impressively deep looking image, cute tiny stars and fine processing.

Quote:

Originally Posted by Startrek

Peter,
Lovely image
Just about as good as it gets
I see your not a fan of CMOS cameras but obviously starting to work them out with excellent results
Well done !
Martin

Quote:

Originally Posted by alpal

Hi Peter,
that's a magnificent picture.
Thanks for sharing.

cheers
Allan

Quote:

Originally Posted by JA

Excellent Stuff ....

The tiny stars and detail/contrast really help create a wonderful sense of depth/ 3D impression!

Best
JA

Quote:

Originally Posted by Dave882

Wow and other stunning shot! I agree with JA it’s definitely got a very 3d appearance to it. Beautiful!!

Quote:

Originally Posted by Stephane

Peter, this image is just sensational (as are your others). May I ask what exposure time you use for your SHO subs, and what your exposure for your stars are?

Many thanks,
Stéphane

Thank you one and all. The exposure details are on the linked page, just scroll down a tad.

That said SII got the Loin's share ('scuse the pun

) of the exposure run....7 hours worth due the low flux levels at that end. OII and Ha were 4 hours each. (all 5 minute subs).

keller60 (Bill) · #10 31-05-2022, 09:57 AM

As others have said "as good as it gets". Thanks for posting.

Retrograde (Pete) · #11 31-05-2022, 10:02 AM

It's a well-imaged target of course but your rendition really stands out.
That scope/flattener combo is something quite special.

Peter Ward · #12 31-05-2022, 10:28 AM

Quote:

Originally Posted by Retrograde

It's a well-imaged target of course but your rendition really stands out.
That scope/flattener combo is something quite special.

Quote:

Originally Posted by keller60

As others have said "as good as it gets". Thanks for posting.

Thanks guys....ironically I cropped the field as the full frame view didn't have the same impact. I might have done better to simply use the field flattener (to get the same framing)

rather than reducer on this one, begging the question how much more exposure at F7.0 (vs F5.0) would have been needed.

Swings, roundabouts

JA · #13 31-05-2022, 02:05 PM

Quote:

Originally Posted by Peter Ward

...
rather than reducer on this one, begging the question how much more exposure at F7.0 (vs F5.0) would have been needed.

Swings, roundabouts

Well f/5 to f/7 is almost exactly a one stop difference, so you'd need twice* the exposure duration at f/7 compared with f/5 to capture the same amount of light. Of course then you'd have to track for twice as long, but i don't expect that would effect you Peter

Best
JA

*Approximately Twice, determined from the square of the aperture ratio (7/5)^2 = 1.96 ~ Twice

pkinchington (Peter (Kanga)) · #14 31-05-2022, 03:31 PM

Lovely final image.
cheers Kanga

Peter Ward · #15 31-05-2022, 05:25 PM

Quote:

Originally Posted by pkinchington

Lovely final image.
cheers Kanga

Glad you enjoyed the view

Quote:

Originally Posted by JA

Well f/5 to f/7 is almost exactly a one stop difference, so you'd need twice* the exposure duration at f/7 compared with f/5 to capture the same amount of light. Of course then you'd have to track for twice as long, but i don't expect that would effect you Peter

Best
JA

*Approximately Twice, determined from the square of the aperture ratio (7/5)^2 = 1.96 ~ Twice

Humm...didn't think it would make that much difference (actually on the stars, being a point source, then nil) but on extended objects...I'll take your word for it.

That said...I'd rather crop the data than go another 15 hours

gregbradley · #16 01-06-2022, 07:36 AM

A wonderful image. Showing the beauty of the AP155, arguably one of Roland's finest creations.

Good you got more of a handle on the banding.

Refractor images are hard to beat. They have an innate beauty about them.

Greg.

Peter Ward · #17 01-06-2022, 09:46 AM

Quote:

Originally Posted by gregbradley

A wonderful image. Showing the beauty of the AP155, arguably one of Roland's finest creations.

Good you got more of a handle on the banding.

Refractor images are hard to beat. They have an innate beauty about them.

Greg.

Thanks Greg....indeed if I could only keep one telescope, the AP155 would be it.

AstroViking (Steve) · #18 01-06-2022, 01:21 PM

Magic!!

Depending on where my eyes focused, I kept bouncing between the lioness and the fighting dragons...

Shiraz (Ray) · #19 01-06-2022, 01:54 PM

yep, that is an exceptional image. Totally relaxing to view - everything looks "right". Cheers Ray

Peter Ward · #20 01-06-2022, 03:20 PM

Quote:

Originally Posted by Shiraz

yep, that is an exceptional image. Totally relaxing to view - everything looks "right". Cheers Ray

Thanks Ray...one could get used to these small pixels

Quote:

Originally Posted by AstroViking

Magic!!

Depending on where my eyes focused, I kept bouncing between the lioness and the fighting dragons...

Ta. My colour mapping was not entirely arbitrary...the big kitty needed to have golden-hued fur.