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View Full Version here: : Continuum Filter Modulation of Narrow Band Star Intensities to extract Faint Nebular

avandonk
04-03-2019, 08:09 PM
Continuum Filter Modulation of Narrow Band Star Intensities to extract Faint Nebular Data to add to RGB Data.


Here is the image. If you interested in details I will post them tomorrow.

https://www.flickr.com/photos/34386396@N08/33401003778/in/dateposted/



Bert
Atmos
08-03-2019, 09:39 AM
Having shot this with an unmodded D810, you've shown that there is a lot more faint nebula than what showed up in mine which was mostly a lot of stars.
pfitzgerald
08-03-2019, 10:33 AM
Yes please Bert.

An interesting image with a wealth of detail.

Paul
Stonius
08-03-2019, 12:42 PM
Huh? So you modulate a Bader solar continuum filter?
Is there some other kind of continuum filter?
How do you modulate a filter's response?
Are you messing with the space-time continuum again? Just remember the lightning strikes the clock tower at exactly 10:04pm on November 12, 1955.

Many questions. I don't understand, but I want to know more.

Markus
Sunfish
08-03-2019, 04:56 PM
Extremely narrow band filters..,? I am a novice so why the separate panels.?
Stonius
08-03-2019, 05:28 PM
Like tuning an etalon? Hmmm maybe it has other uses besides solar.

He's just going to wait until the rumours run rife before answering :-)

Markus
avandonk
19-03-2019, 10:43 AM
An Astrodon Continuum filter is a 5nm narrow band filter not centred on any emission line. It just records star intensities.


Here is the OIII data with the Continuum data subtracted.


https://www.flickr.com/photos/34386396@N08/46563343274/in/photostream/


Here is the NII data ditto

https://www.flickr.com/photos/34386396@N08/46500653715/in/photostream/



Can anyone spot the obvious PN? There are quite a few more that were hiding in plain sight.

Sorry I took so long to get back but I got distracted.


The RH200 at 600mm and F3 is fast but here is what the RGB looks like.

https://www.flickr.com/photos/34386396@N08/46692615034/in/photostream/




My major aim in imaging is to look around and image dim stuff and areas that have been neglected that have interesting dim objects. With the wide field of the RH200 3.5x3.5 degrees I can cover a fair bit of sky.

This may give others with longer focal lengths some interesting objects to image at greater detail. Bert