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IC1396 Elephant Trunk in Cepheus

Fay

By Fay
in Imaging - Deep Sky

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Fay

Fay

Posted
Posted

Went to a sky camp the weekend, so better sky than at home.

This was 20x600, QSI 583ws, SW ED80, 0.85fr, 12nm ha filter.

The subs of the last three deep sky objects, I have tried to image lately, have come out with hardly any detail, I was using the 7nm ha filter. I used the Astronomik 12nm for this one, and there was a lot of difference in the subs taken with each filter.

Thanks

Fay

7281916312_824d77edb7_b.jpg

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AndyUK

AndyUK

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Hi Fay - That's REALLY nice...! And that's a lovely FOV you've got with that QSI. I took 20x900s on this same object on Saturday night with my Equinox 80 / 314L+ using the Baader 7nm Ha filter. It might be interesting to compare the difference...

(Are you intending to get any OIII/SII for this as well, or maybe RGB and use this as luminance?)

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Fay

Fay

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Thanks Andy. I would love to get some O & S, good conditions are few & far between lately, for all of us, so I always want to go elswhere, when I should stick to my O & S plan.

I love my Atik 314.

I have used the 7nm a lot with the QSI, but the last 3 times i have given up on the subs, even lots of 900 & 600 secs on The Christmas Tree from Kielder, of all places.

look forward to seeing yours

Fay

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Spikey

Spikey

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Lovely detailed pic Fay. I've got the Baader and the Astronomik Ha filters so that is a very interesting observation. I found difficulty controlling the halo in the bright stars that the 12 tends to display whereas the 7 exhibits hardly any.

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davew

davew

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Hi Fay,

In theory at least, the 7nm filter should give better S/N ratio and slightly more contrast.

Looking at the specs of Astronomic and Baader it seems the Astronomic filters are rated at about 97% efficiency and the Baader around 90%. How true those figures are I don't know. If correct the Baader would need slightly more exposure I should think. Why your subs are wildly different I'm not sure. I remember the Kielder subs and they weren't great. The KAF 8300 chip is less than 50% efficient at the Ha line so it all adds up.

Another thing to consider is the anti-reflective coating. I think your Baader is better than the Astronomic.

Perhaps try 900 subs with the 7nm and look again.

Re the image. Once again you've created a lovely smooth background and it doesn't look like you've used much, or any, noise reduction. Quite how you do that with the 8300 chip beats me :(

Dave.

re Andy's image. I think it has more " Snap " but that could be processing.

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Fay

Fay

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Thanks everyone. Yes i will be keeping an eye on the filters to see how they continue to perform, in what conditions etc.

Yes Dave. I think Andy's is sharper. I have done a bit more processing to improve the sharpness etc.

Fay

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Jessun

Jessun

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Very nice!

Mono, mono, mono.... I feel like Arthur Dent, only he thought 'Yellow' in the opening of THGTTG. It's a word that has stuck in my head since you and so many others get some really, really nice images with monos.

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ollypenrice

ollypenrice

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Looks good to me, Fay. It may be that the 8300 chip doesn't like the Baader filter. I do get better results with the Baader 7Nm than my Astronomik 13Nm but that's with the 4000 chip. A dark art... Who knows?

Olly

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martin_h

martin_h

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well my attempt at processing my O & S has failed, nebula looked like thick orange semolina!!!!!!! Back to the drawing board!!

Fay

Longer subs may be needed, I have the 8300 chip (QHY9) and always use 15 - 20 mins subs for narrowband, using the Baader filters.

The image below is 5 subs in each channel.........

Trunk_nb_web-2.jpg

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Fay

Fay

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I think you are right Martin, especially from my home location, that was taken at a dark site.

I have always used the 7nm with the QSI Olly, so not sure why I have had 3 duff results lately.

Fay

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