double crab

[alacant]

Hi everyone

Despite the fact that f8 is far too slow for astro-photography (don't!) and whilst waiting for The Crab to get high enough, we went for the double cluster anyway. The aberration-free reflector never fails to surprize. Even with my processing, there's a hint of blue in some of the stars:)

Not much detail in The Crab, not sure what to do about that. Maybe a milder stretch for the central part and then layer over the brighter?

Thanks for looking and all comments most gratefully received.

eos 700d on  nt150l

 

Edited January 4, 2020 by alacant

[vlaiv]

51 minutes ago, alacant said:

Despite the fact that f8 is far too slow for astro-photography (don't!)

You think that simple "don't" will keep us at bay?

[alan potts]

Vlaiv showed me an image a few months back taken with a 180mm Mak at F15, as I was asking about using the one I have. The image was as good as anything I have ever seen posted on this site, whilst I am sure it is not easy at 2700mm and F15, it sure can be done by some with more skill than I can muster.

Nice images BTW but I feel a tad too rich in red/orange colour, I feel they would be better a little less saturated.

Alan

Alan

[david_taurus83]

That 6" aperture will collect the same amount of photons as a 6" aperture at F2. Neither are slower or faster. The only difference is field of view and concentration of photons on the sensor pixels. Great images btw

[ollypenrice]

Your Crab's nice and a classic in the LRGB/OSC genre on this object. The problem, if there is one, is not that the core is saturated (it isn't) but that the filters you're using are not holding down the broadband spectrum around the filaments so these don't show strongly against the light around them. The bolder Ha filaments show strongly but an OIII filter would find an intricate network of fine lace-like lines. I doubt that any image can have it both ways, ie the natural look of LRGB/OSC and the contrasty filamentary detail of narrowband. (I hope to find out next month by taking some LRGB to go with this month's NB.) Your version, colour apart, gives a good idea of the eyepiece view in large apertures. I like it.

Olly

[Datalord]

3 hours ago, alacant said:

Despite the fact that f8 is far too slow for astro-photography (don't!)

I'll immediately put an axe to my 12" CFF RC at f/8.

[alacant]

2 hours ago, Datalord said:

put an axe to my 12" CFF RC at f/8.

LOL. Too right mate. F8? Get rid before anyone notices!

4 hours ago, david_taurus83 said:

Neither are slower or faster

 

Ahhggghh!

5 hours ago, vlaiv said:

don't

You can't say I didn't try😉

[ollypenrice]

Now, Alacant, your insistence upon remaining forever in the beginner section should, in my view, preclude you from making 'in jokes' regarding focal ratio which, for real beginners, are a source of serious confusion and sometimes the wasting of money. While those of us who know you know that you do not fall for the F ratio myth, we must be sensitive to the needs of genuine beginners in search of real information. Play fair.

Olly

[andrew s]

19 minutes ago, ollypenrice said:

 While those of us who know you know that you do not fall for the F ratio myth, we must be sensitive to the needs of genuine beginners in search of real information. Play fair.

Olly

Can you remind me what that myth is again @ollypenrice.

Regards Andrew 

[ollypenrice]

23 minutes ago, andrew s said:

Can you remind me what that myth is again @ollypenrice.

Regards Andrew 

I used to like you, Andrew!

😁lly

PS And Vlad can shut up as well!!! 🤣

Edited January 4, 2020 by ollypenrice

[alacant]

28 minutes ago, andrew s said:

Can you remind me

Hi. It's when you have two...

Ooops, almost blew it there!

[david_taurus83]

Was there a joke?!

[ebdons]

Hi thanks for posting the images, very nice and the crab neb is still ok with colour shift. at least you have some clear skies over the espana area. keep the images coming! ton

[alacant]

M1: There is quite a bit of detail. I think I overdid the denoised layer. Here it is with a less denoised layer underneath; it's found some more detail. Next I'll try the colour. Stand well back!

[wimvb]

On 04/01/2020 at 22:25, david_taurus83 said:

Was there a joke?!

At least a few moans. 

[wimvb]

3 hours ago, alacant said:

Next I'll try the colour.

I would use scnr green (hasta la vista green in PS speak) to lift the colours. 

Very nice set of images, btw.