ollypenrice

Lovely job, Dave. Nicely balanced processing which makes me think mine was shouting a bit!

lly

1 hour ago, robin_astro said:

I want to know what makes a shape a shape 🙂

It becomes a shape when looked at. 

My objections don't appeal to the standard model in any way whatever. I'm not trying to protect it, I simply want to know what makes a shape a structure. 

Olly

I don't understand why living in a first floor apartment means that power is a no go.. You can just use a power pack as many do.

Olly

18 hours ago, CCD-Freak said:

Check your RGB Debayering settings.  

It looks like you have some good data.

 

 

Good call.

Olly

With a small chip like this you won't have anything like as much trouble with tilt as you can expect with an APSc. You're working within the comfort zone of the image circle. As for sucking in the photons - you bet. 3 hours with the RASA is a long exposure time. While my Avalon is out of commission our RASA rig is doing fine on a very well-used 12 year-old EQ6, too. You are in for some fun, I think.

Olly

Never forget that Henri Cartier-Bresson said, 'Sharpness is a bourgeois concept!'    It's a quality seen more frequently in pictures than in reality, too. We are all tempted to over-do it.

I think it essential to test each each iteration of sharpening against the original by importing both into a program offering layers, so you can blink the sharpened version on and off, vary the opacity so you can have some, rather than all, of the sharpening and you can erase it entirely in parts where it is not a benefit.

Olly

I confess to posting this earlier as B32, in a croped form. My processing was a total bungle from start to finish. Here I post it under a new identitity with grovelling apologies to Paul Kummer who did capture and stacking. 

Edit. Link to larger one: https://ollypenrice.smugmug.com/Other/Emission-Nebulae/i-d4KDgCR/A

😬lly

I cannot imagine imaging without a permanent observatory. Hats off to those who do - and I really mean that.

Olly

Great results. The RASA isn't overkill at all. You could push significantly harder for the faint stuff if the mood took you. It's in there.

Olly

25 minutes ago, Adreneline said:

 

That aside I feel you are duty bound to extend the above all the way across to Sh2-284 🤣

Good luck Adam!

Adrian

Seconded!

lly

What factors make this ring a structure?  So far as I can see, it's considered a structure because it takes the form of a spiral. But does a shape equate to a structure?  I'd have thought that, to be regarded as a structure, an object needs more than shape: its shape needs to be the consequence of coherent forces at work, forces which would produce this shape and no other. The components of a structure, unlike a shape, need to be united by a common experience or common history. Is there any evidence of this corkscrew's having been created by, or being sustained by, any forces in common?  If not, I'd be more inclined to consider it a shape than a structure. I'd certainly consider it to constitute circumstantial evidence in favour structure but, until some uniting force were revealed, it would just remain a chance shape for me.

(I once had the pleasure of attending a course and workshop run by Dr Roger Clowes at UCLAN. He was most entertaining and most impressive.)

Olly

10 minutes ago, Adreneline said:

Three frames with the Samyang + ASI1600 equivalent gets you the whole thing, including Sh2-284 - a real jewel in the sky.

I started this some time back - in fact January 2020 - it continues to be a work-in-progress.

20% overlap:

Adrian

That's great, particularly in Ha which shows the connections so well.

Gettng started on Samyang 135 mosaics is always a risky undertaking! https://ollypenrice.smugmug.com/Other/Emission-Nebulae/i-TqBkb24/A

Your Sh2-284 looks lovely. Another one for the RASA...

Olly

17 minutes ago, old_eyes said:

Another fabulous target Olly. Lots of interesting detail and a nice tailing away to the south(?). The nebulae seem nicely balanced in intensity as well, although I don't know how much of that is in the processing of the multiple sources you used for this.

I look forward to the 'proper' image!

South is correct. I tried to match the hues from each source and would say that the Sharpless objects are a tad brighter than in nature. Then again, the Rosette here had a near-infinite amount of data  and I stretched the blazes out of it.

Olly

This is a situation in which 'stacking the stacks' can be better than stacking in one go. Make two stacks, one from each orientation, then co-register one to the other, crop the edges of the co-registered image and then stack it with the base image. Whenever you combine images it is vital to edge crop them because edges always have artifacts.

Olly

Now that I've finally spotted this as a framing, I find myself wondering why it's not an established imaging classic. I've always felt the obvious extension was to the north and the Cone region rather than south to these.  I suspect Paul Kummer and I will try this one properly at some time, using the RASA. For now this is a small doodle based on a Samyang 135 base image overlaid by an old Tak FSQ HaLRGB Rosette and RASA Sh2-280 and 282 in OSC. We'd actually need two more RASA panels to fill in the little bits that are missing. Samyang and RASA data captured and pre-procesed by Paul Kummer.

Olly

One of the most attractive objects in the sky and done beautifully. It's easy to make nebulae look falsely solid but this is truly gaseous and ghostly. 

Olly

20 hours ago, Stu Wilson said:

ps heres the .tiff if anyone wants a go at it.

Autosave002.tif 79.51 MB · 2 downloads

Thanks, Stu. I was very impressed by this as the result of 33 minutes in non-exotic F ratios so I enjoyed playing with it. Advances in camera technology and processing tools do, quite honestly, beggar belief. What I couldn't find was much star colour. Do you use an LP filter?

Olly

1 hour ago, gorann said:

Great to see it in broadband Olly! Sh2-280 and 282 are actually not much imaged at all. They are a bit low on my horizon but I had a go at them a month ago with the NBZ filter.

Cheers, Göran

 

The lower nebula in particular really shines with the filter. These are good objects.

Olly

Great. I missed this post earlier on.

Olly

This appeared just below the Rosette on our Samyang Orion-Monoceros mosaic so we had a closer look with the RASA. It looks like a smaller Flying Bat nebula - a Flying Pipistrelle, perhaps?  Like Lower's Nebula, this is big, bright and rarely seen in boradband images. Too many famous neighbours, maybe?

Capture and pre-processing, Paul Kummer/ My post processing. 120x3 min subs.

To see it in context, here's the link to the mega-mosaic with these data blended in.  https://ollypenrice.smugmug.com/Other/Emission-Nebulae/i-TqBkb24/A

Olly

Really sweet. Maybe the first one for me?

Olly

13 hours ago, Skipper Billy said:

Better than Starnet2 ??

For me, yes, but some find it variable from image to image. I also had a lot of hassle getting Starnett to work at all and then Pixinsight imperiously deleted it from my PC, which got on my wick.

On some images, usually large mosaics, StarX can leave a kind of checkerboard grid pattern latent in the image but that's the only downside. There are different ways to recombine the stars. I don't find one consistently better than the other: again it varies from image to image. I still regard StarX as the biggest technical advancement in AP (hardware or software) since I started fifteen years ago.

Olly

We don't dither using a CMOS OSC on either of our rigs and I didn't dither with the CCD rigs either. They were dual rigs so it would have been complicated. Looking at your kit list, I'd only regard it as essential with the DSLR and there it really is essential.

Olly

Crisp and nicely exposed.

Olly