ASI 1600 MCC Pro Doesn't debayer properly

That is very strange, what APP version are you using?

V 1.079.  I reran the data and the plaid color went away but I still don't have colored stars.  I must have changed a setting?  Also, I had gain=0 in the photo per ASI recommendations.  I read int his forum the gain should never be 0.  Could this be an issue with the missing color in the stars??

Thanks

Mark

Posted by: @mark_k_connollymsn-com

When I debayer the fit from my 1600 MCC Pro I get a large colored cross hatched pattern and the stars, etc. do not have color.  I tried every debayer option.  I am new to APP so just starting.  Thanks

Hi Mark @mark_k_connollymsn-com,

There must be something odd happening with your data to produce such a result... I don't think it is related to debayering, that would give a different appearance...

Please share 1 or 2 lights with us and we will check what is happening and how to solve it 😉

I guess that a gain of 0 would give issues, I have never tried that myself.

So to get to the bottom of this, can you share/upload 1-2 frames with gain 0 and 1-2 frames with a postive gain value?

You can upload the frames here:

https://ariesprodstor.astropixelprocessor.com:7001/

login and password: appuser

Please make a folder with your name and let us know once uploaded 😉

Many APP users use the asi1600 mcc pro and it should work properly in APP.

Mabula

@mabula-admin

I sent the files to Mark C folder

Thanks

Mark

What are others using for gain and debayer for the 1600MCC Pro?

Thanks

Hi Mark @mark_k_connollymsn-com,

Thank you for uploading your data.

You are shooting with SGP pro, this means that you need to set the following:

0) RAW/FITS, force Bayer/X-Trans CFA , you will need to do this, because SGP Pro does not store any metadata to tell other software that this is Bayer data.

1) set the correct Bayer pattern for your sensor, I think this is GRBG.

I think you set that, right?

Then the strange pattern in your stack, I don't see this in the single lights that you sent me, this is a strongly stretched light frame with background neutralization on:

Off course, we see vignetting, but I can't see that odd pattern.

I think that the pattern might be there in other light frames perhaps, maybe you shot some frames where something was actually blocking part of the light that was entering your telescope? Like a mask or perhaps a fence? Like shooting at the object just before it drops behind a fence ? Have you checked all of the light frames? Check the first ones and the last ones of the imaging session, perhaps that will explain it?

Then regarding color, you are using a LPS v4 filter according to the SGP pro metadata ?

This is the same frame, but without background neutralization and only slightly stretched:

Look at the histogram, the red channel is very weak ! the LPS filter is really killing the red signal relative to the green and blue channels, that might be the reason that you are seeing no or very little color in your stars. A LPS filter like that, would probably only be useful to shoot luminance data instead of RGB data? Which LPS filter exactly are you using?

Regarding normal gain/offset values: the camera drivers should give you an option of possible gain and offset values, right? Like High Dynamic Range, unity gain etc...

I think that shooting with gain 0 is possible, that would be the High Dynamic Range setting. Have you set the offset as well?

I have an asi1600mm-c, so the monochrome version, and I shoot mostly with gain 60 and offset 20. But I have also shot with very low gain and high gains depending on the object and filters that I used. It should all be possible I think. I see very little difference with the gain 0 and gain 130 frames that you sent me. But... the gain 130 frames were shot with 300 seconds and gain with only 120 seconds. Gain 0 means high dynamic range, you can probably shoot 10 minutes per exposure with the LPS filter with gain 0 and then maybe things will look much better ;-). So 120 seconds exposure time with gain 0 just might be way too short to get some good signal above the noise levels with your LPS filter.

Mabula

Mabula

I do force CFA and use GRBG.  I also do get an option of gain but the offset is not available.  Ill try longer subs and more gain.  

Thanks

Mark

Unity gain on my 1600 MC is 139, but I know many that regularly shoot around 50 and just take longer exposures, I usually use unity gain 139, offset 21 and shoot 30 second exposures, for what that is worth

Thanks Tim - I am in a first ring suburb with bad light pollution.  Phone app says bortle of 8.  I have a max of 5 min lights to minimize background light issues.  

I am also in a bortle 8 area. At 5 minutes what exposure are you using?

With exposure time of 5 min I am experimenting with gain from 0 to 300.  I that your question?  

@mark_k_connollymsn-com

Yes that was my question, I should have said Gain/ISO