globular clusters

[alacant]

Experiment: same exposure, same night, same bias, flat and dark flat frames. Different noise.

M92 was first so I'd expected m13 to have less noise; higher and less turbulence. Anyway, I thought the comparison was interesting. Only a light denoise as some of the stuff on the edges of the cluster is a bit delicate. Must try something else. Yeah I know, more snaps!

Thanks for looking and clear skies.

10 15s + 20 60s iso800

[Tangoringo]

Sorry. I can't answer technically but these are lovely images.

[Uranium235]

Both look alright to me, no intrusive noise to speak of. The only thing I might suggest is using a layer mask to restore the cores of each glob. M13 would benefit most from that so you can uncover the "propellor" feature it has.

[mikey2000]

They both look suitably noiseless to me.  I might prefer a little less saturation (but that's personal taste).  

 

I really like globular clusters.  I'd never really heard of them until I 'got into' astronomy a few years back.  Invisible to the naked eye (where I live), fascinatingly smudgy in a telescope and somewhat easy to photograph (compared to other DSOs). 

 

I hadn't thought of layer different images with different brightness to reveal hidden details in the core though.  Great idea!

[StargeezerTim]

Lovely colourful cluster images. Nice...

[alacant]

18 hours ago, Uranium235 said:

using a layer mask

Hi and thanks for looking. Yeah, I layered the 15s stack on top of the 60s with multiply -similar to a m42 HDR merge. That's probably not the way to go...

[alacant]

13 hours ago, mikey2000 said:

easy to photograph

...and you can do them alongside the moon too. I suppose the major challenge is tracking. Anything slightly out and the tiny stars become streaks and make the delicate edge-of-cluster stars blobs when stacked. No cheap refractors either...

13 hours ago, mikey2000 said:

layer different images with different brightness

It seems to be quite a common trick for other stuff where there's a hdr. The best way I've found is to process each set differently and then layer rather than process both as e.g. dss groups.

[Dave In Vermont]

I would call both images a success! Very much so.

Please keep going & sharing!

Dave