NGC1760 bicolour

[Shiraz]

NB is way out of my comfort zone, but there has to be something to do when the moon is up. tried to keep the colour as close as possible to the broadband versions on the web.

http://www.astrobin.com/full/288468/0/?nc=user

there is no real point in high resolution with this object, so it is software binned 2x2 to improve the SNR. It really is a spectacular region though, with a huge cavity opened up by the bright new stars and very ragged tendrils all over the place.

250f4 Newtonian with ASI1600 at gain 100 and 200. Ha=54x600s O3=39x600s. Thanks for looking. regards Ray

[Placidus]

Way to go, Ray! :thumbsup::thumbsup::thumbsup:

"Thor's Other Helmet" as Fred calls it looks sharp and deep. The globular at the bottom of the image adds lots of interest (it's out of field for us).

[DJScotty]

That's very nice Ray. Good work! :thumbsup:

[Atmos]

Really nice Ray. Did you find the 2x2 binning help a lot?

[RickS]

Very nice, Ray :thumbsup: Maybe just a little too biased towards Ha/red? Not sure you should take too much notice of that comment after my last couple of images, but I'd treat this one a little differently ;) The detail is fantastic, BTW :)

[gregbradley]

Beautifully done. Look how tightly resolved those small bright central stars are.
Wonderful.

Greg.

[glend]

Love it Ray! Great detail in the central core cluster area. How did you prevent diffraction spikes?

[strongmanmike]

Lovely crisp clean rendition Ray, noice :thumbsup:

Mike

[Shiraz]

thanks very much - appreciated


thanks Scott


thanks Colin. binning did no damage, but improved the SNR by a noticeable amount.


Thanks Rick. I am incompetent at this, so tried to keep colour as close to a variety of broadband images as I could - maybe with limited success. Will have another look at reducing the red a bit.


thanks Greg. taking the sampling down to ~1.6 arcsec sure makes the stars look nice and small doesn't it?


thanks Glen. the spikes are there, but not very pronounced in NB, especially with binning.


thanks Mike.

regards Ray

[Peter Ward]

Lovely. I really like this one.

A great result by any measure :thumbsup:

[Andy01]

Hi Ray, whilst I don't understand your comment, I do appreciate that you have done a great job on this difficult target. :thumbsup:

I say difficult having imaged it twice for a zillion hours in NB but I have yet to find a truly pleasing colour palatte, as indeed you have done here. :)

The image is well composed, nicely balanced and maybe just a tad red, and it's very good result. :clap:

[SimmoW]

Love it Ray, very natural looking other than the red cast/background.

Not hearing much on the forums re. binning this camera, so I'd love to see a comparo of bin2 vs bin1. Could you pm me a link to any files? or better yet, post here for others to see too?

[Shiraz]

thanks very much Peter


thanks Andy. the comment on resolution could have been better expressed, but the point I was trying to make is possibly illustrated in the unbinned/binned comparo http://astrob.in/full/289059/0/ which shows (I think), that there is little point in displaying a big billowy neb like this at full resolution for web viewing - it looks better and is easier to take in at lower scale - and, apart from some very faint stars, there doesn't seem to be any loss of significant information.


thanks Simon. I chose a reddish cast because the DSS1 data show some extensive red nebulosity surrounding the main region. However, I take the point and will reprocess some time soon.

the binning was not done on the camera, but in software (Nebulosity), after it was all processed. My understanding is that the camera does not do a very good when binned (loses a couple of bits of dynamic range), so I have never used it that way. The image at http://astrob.in/full/289059/0/ shows some non-binned and binned data - I think that the extra SNR and perception of sharpness justifies binning.

[Atmos]

It is a lot better to software bin than hardware bin with this camera. I would argue that it is better to process unbinned (especially for decon as larger stars respond better than smaller) and then reduce resolution later on.

I think what Ray is getting at with the binning on this nebula is that there is no high contrast regions that suffer. Taking Eta Carina as an example, there are a LOT of high contrast regions in and around the Keyhole Nebula that benefit from as much resolution as possible.

NGC 1760 is a lot more whispy with some detail in the nebulosity but virtually no contrast.

[Paul Haese]

I agree it is a great object. I have imaged it twice in recent year and think it has a lot to offer for imagers. Probably better in full NB I think. Glad to see you tip toeing into the NB waters Ray.

[Regulus]

This is a very effective image Ray. Well done.

Trevor

[Stevec35]

You're definitely on a roll Ray. That looks great. The colour is so natural that it's hard to pick it as a NB image. Extremely nice composition too with that little cluster at the bottom

Cheers

Steve

[Shiraz]

yep, that was what I was getting at - the nebula does not have much fine detail, so full res is not needed.


Thanks Paul. Am trying to keep on the edge of the NB waters - they look pretty deep


thanks very much Trevor


Thanks Steve. Appreciate your comment, because I put a lot of time into balancing the colour so that it looked as close as possible to a broadband image that I found.