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Monday, January 14, 2008

QHY8 Narrowband information, update

I have recived info about QHY8's Bayer matrix filter's spectral responce: Blue portion of the Bayer matrix in QHY8 = 460nm Green portion of the Bayer matrix in QHY8 = 540nm In Baader UHC-filter O-III and H-beta are in same block.

In the image can be seen, that first slot in filter contain wavelenghts between about 460-540nm. ( H-beta & O-III) When compared to QHY8's spectral responce, it looks like most of the O-III is ending up to the Green pixels and H-beta is ending up to the Blue pixels. There is overlapping and some weak parts, but least in theory, those wavelenghts can be separated in some amount. When weather allows, I'll test this under real skys. I guess, longer integration time will be needed. This is possible only with Bayer matrix color camera. When grayscale camera is used, all the information will end up to the same channel, sorry.
www.tips-fb.com Posted by J-P Metsavainio at 11:00 AM 0 comments
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Sunday, January 13, 2008

Narrow Band with UHC-s and H-alpha????

This is a very interesting test run! I started to think, if I use UHC-s filter to capture colors to my H-alpha luminens, what other information UHC filter might captured? The UHC-S filter is a multi bandpass filter made so that only some portions of light in the visual the spectrum are transmitted. This UHC-S will pass a total of about 100 nanometers within the 400 to 700 nma range, with high percentages of transmission of that light in the portions of the spectrum commonly emitted by emission or diffuse nebula Here is the spectral responce curve for the filter.

As you can see there is spike at about 500 nm containing both O-III and H-Beta, In singleshot camera those bands are ending up partly to Green and Blue channels!!!There is lots of H-alpha as well, but we are not interested about that, becouse we have separate 7nm H-a filter data. So this is a background and here are few samples what can be archived with that data.

This is a very first test run and there is lots of things to test, but it looks promicing so far.

All images have been taken with QHY8, a sigle shot cooled 6mb astro camera.

original H-alpha 16 x900s + 5 x 1800s light frames used. Total exposuretime about 6,5 hours. LX200 GPS 12" f6.3 + SXV-AO (Active Optics system) Elephants trunk nebula in IC 1396 This is pure RGB data with Baader UHC-filter 5x900s

Final RGB image, combined from previous images.

Lights: 5x1800s + 15x900s @H-alpha Color data: 5x900s UHC-s filter combined as HaR(Ha)GB

Hubble palette test from the same original data RGB > BRG and some color balancing Modified palette test from the same original data

Here is the same method used for the Bubble nebula image

Original RGB data.

Exposure time is 4h for H-a and 2h with UHC-s filter for RGB. HaR(Ha)GB image is combined from the data. Modified Hubble palette from the same material as the original RGB Palette variation from the same data

I hope, that someone else will test this method and report here about findings.

All comments and opinions are welcome.

www.tips-fb.com Posted by J-P Metsavainio at 10:45 PM 2 comments
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Saturday, January 12, 2008

weather = %666¤@£´&&%##¤

Days are short, but weather does not give any support.
Daylight time at the moment only 4h 44mins.
www.tips-fb.com Posted by J-P Metsavainio at 8:43 PM 0 comments

Friday, January 11, 2008

Bubble with new color II

This is the new color version of the Bubble Nebula.
I tested a new method for me. After normal processing I added "Shadow and highlights" command under PS to red channel only. 33% shadows and 20% highlights at 50% range. There is now much more red nebulosity visible in the image with no extra noise. Compare this one to previous one.
www.tips-fb.com Posted by J-P Metsavainio at 12:15 PM 0 comments
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