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Old 28-02-2018, 10:23 AM
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PKay (Peter)
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M4 M5 comparison

Captured both this morning.

M5 - 20 9s subs
M4 - 40 120s subs

Gain at unity (139)

Both cropped.

Maybe I have reached the limit of resolving power for the 85mm.
Will try and do the sums one day.

Feel free to add your M4 /5. Would be interesting

All good fun!
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Last edited by PKay; 28-02-2018 at 10:29 AM. Reason: yes
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Old 28-02-2018, 11:44 AM
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I would love to add but the weather just wont cooperate.
Nice work.
alex
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Old 28-02-2018, 03:28 PM
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billdan (Bill)
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This is mine I did in August last year.
4 x 900secs with QHY12 on 8in F5 Newt

Cheers
Bill
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Old 28-02-2018, 03:42 PM
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Magnificent Bill. I wonder why they are like they are...I had an idea that they were the centers of galaxies that had their outter regions stripped when as a galaxy they encountered another galaxy..well us I guess...I think I read someone had a similar idea but what ever they are extrodinary objects.
alex
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Old 28-02-2018, 04:10 PM
raymo
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Nice job Bill, but the colours are too saturated for my particular taste.
Here's an old one of mine Peter, prime focus, uncropped with my
8" f/5 Newt, 1100D 10x 30 secs @ ISO 1600.
raymo
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Old 28-02-2018, 04:47 PM
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Atmos (Colin)
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I’ll have to try imaging with my Mewlon at some point and seeing how that goes.

Globular clusters are the most basic kind of proto-galaxy. I call them proto-galaxies because they are in effect (when thinking back 12 billion years ago) over densities of gas that either didn’t have enough gas to become an irregular dwarf galaxy or didn’t merge with any other proto-galaxies to grow larger.

One notable acception to this is Omega Centauri which is considered to not be a globular cluster as much as a disrupted dwarf galaxy, stripped of its gas and many of its stars. It has two of its own globular clusters!
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Old 28-02-2018, 05:00 PM
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PKay (Peter)
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Bill, Raymo, both great images and quite different.

First thing, the larger aperture does (or can) bring out more detail, but we all know that.

Bill's image shows a lot of colour in the stars and that lone very hot blue one is a great capture.

Raymo. Your image has isolated the brighter stars. Experimenting with the amount of stretching, to give an interesting result is challenging and you did well.

----------------------------------------------------------------------------------
If any one is up for it, M80 (Scorpius) and NGC 5897 (Libra) are well placed after the moon sets.

Set the alarm...
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Old 28-02-2018, 05:09 PM
raymo
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Unfortunately I ceased deep sky work some time ago, so have only my
past images to choose from.
raymo
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  #9  
Old 28-02-2018, 05:23 PM
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PKay (Peter)
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Raymo, wide field is fine, and even better...using an eyeball scope

Here is M4 uncropped.

PK
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Old 28-02-2018, 06:33 PM
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There is more than one way to skin a cat.
I did mine deliberately to highlight the curved chains of stars between about 5.30 and 10.30 on my image; I haven't seen so many in other globulars.
raymo
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