Narrowband data and their differences in imaging

[swag72]

I thought that someone may find this of interest - It is a comparison of the difference between narrowband data (Ha, OIII and SII) on the same target.

I know that I often wonder what the difference is and whether SII for example will show up in the final image as it always seems so faint. Every emission nebula is different in its composition and this will certainly not hold for every target, but I thought that it was an interesting visual comparison nonetheless.

[red dwalf]

very interesting to see the differances.

[Knight of Clear Skies]

Interesting to see, which nebula is this please? I don't recognise it in deconstructed form.

Would be interested in more of these to see if there is a pattern. I wonder if the heavier elements such as silicon are less easily dispersed by the radiation pressure from the newly formed stars.

[swag72]

This is NGC1491 - Not one of the more well known nebula's - I just fancied doing something a little different!!! Turned out OK

[Interested]

From Ha to S-II, progressively less nebulosity, but more Stars. Swings and roundabouts?

I use a 5 position filter wheel with the 383 (2" filters) and currently have RGB, Ha and O-III loaded. Having seen your comparison above Sara, in future, certainly worth looking at the first couple of NB subs to determine potential for a bi-colour process.

[swag72]

I always collect Ha and OIII Pete - Then have a play to see whether I think I need to collect SII to get the colours I want....... sometimes I do and sometimes I don't Sadly there's no hard and fast rules.

[Gina]

I can usually find some SII in most nebulae   I could post some more Ha/OIII/SII comparisons

Saw one of your images on the Sky at Night Sunday, Sara   Plus one of Tim's.

[Gina]

This is the Eagle Nebula captured in July 2013 which I have been reprocessing.  These are the stacked subs, aligned and resized to 1200x960px and saved in JPG format for this post.

11x10m Ha

9x10m OIII

8x10m SII

[strutsinaction]

Fantastic, Gina! Looking forward to trying NB imaging myself at some point in the future. Images like these inspire me.

Regards

John

[MiguelMJr]

Like a little kid at Christmas (that's me) I can't wait to start doing NB, but that is still a year away. 

Thanks Sara and Gina for putting up such beautiful images, they will help keep me going while I slowly save up my pennies.