Eta Carina - Second Attempt at colour narrowband

[JohnH]

24*4mins Ha and Oiii this time and a better looking result. The distorted star shapes are from the Oiii data - it seems like my filter may not be orthogonal to the light path. Overall I am quite pleased with this and I can probably improve it further by stacking some of the older lights with the new data and masking the stars to keep shape and colour. This is a steep learning cureve for me but I quite like this result.

[multiweb (Marc)]

Mate putting aside the colors you have some stupendous details in your shot. For instance I've never seen so clearly the small jets at the bottom middle in amateur shots. Only in highres Hubble shots and you've picked them up. This is really really good... Are you using any kind of AO or is your seeing always that good?

[telecasterguru (Frank)]

John,

You have some fantastic detail in your image. Looks great.

Frank

[spearo (Frank)]

Very nice
I guess you're using an SCT at F/10 or F/11 ?
Great detail on the fickle finger
I'm working on this one as well myself but in LRGB.
nice work
frank

[JohnH]

Thanks guys

I said I like this result, I like it better now! I even like to colours, sort of - I guess I must go for the Sii and then try the hubble pallete...

Not sure about the seeing - it was pretty good over the last week or so - stars were not twinkling visibly if that helps. CCD Inspector says FWHM was 2.16" at the start of the run and 2.76" at the end - I understand seeing if typically 2-3" in suburban sydney so it is not exectional.

No AO is in use - just a nice G11G with a Lumicon OAG/QHY5 and Guidemaster plus a reasonable amount of lights, oversampled (1.4"/pixel), drizzle combined 2x2 for processing including a little sharpening and then brought back to native CCD res for display.

[JohnH]

Originally Posted by spearo

Very nice
I guess you're using an SCT at F/10 or F/11 ?
Great detail on the fickle finger
I'm working on this one as well myself but in LRGB.
nice work
frank

Nope - it was a North Group 127mm triplet APO with the Opticstar 145M - a cooled Sony EX HAD ICX285AL CCD in there - which works out at 1.4"/pixel so my fov is small - 31.4x23.6'.

I want to put an FR on this system by I tried my 0.8x WO Flat3 and it distorts the stars (the 127 has quite a flat field) so I am looking out for a mild FR suitable for a flat(ish) field f7.5 refractor....suggestions welcome.

Or I need a bigger sensor...

Never stops does it?

[spearo (Frank)]

Its very impressive.
I fear you're right...it never ends and there is no cure.

frank