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OSC and Tri-Band Filter
I have just acquired an ASI294MC-Pro and fitted it with an Optolong L-eNhance tri-band filter. Whilst I have some experience with astroimaging, this is my first OSC camera and also I am new to APP, so please bear with me.
I note that when setting up the RAW/FITS at the start, that for a 'standard' camera such as mine then Adaptive Airy Disc is used. I also note that the help tips say for narrow band use the appropriate setting. This is where I am confused.
Which is the best setting to use when images are taken with OSC fitted with tri-band?
First of all, welcome! And thanks for choosing APP.
So, the Optolong filter is a duo-band only right? Ha and OIII. You will probably need to check the "Force CFA" and pick one of the Ha-OIII options. The color option will produce a combined image just like it is. The others will seperate the Ha and OIII for you to be able to work on before combining later.
Thanks for the reply and the advice - just what I needed.
I realise that this filter is actually two-channel/duo band. I used the term tri-band only because several manufacturers use that description e.g. Altair Astro. I think they call it tri- because one channel covers Ha and the other covers both OIII and Hb.
(I'm looking at buying the asi294mc-pro.) Can you tell me why there needs to be an Ha-OIII selection? Why couldn't the images be processed like a normal CFA, and why do narrow band images need a selection? Can't they just be processed as monochrome or is it just for labeling?
You can just go for monochrome only yes (it's one of the options in the menu). It's all about choice, you can select Ha-OIII color to just get a color integration as-is, you can go mono which combines the data into one monochrome stack and you can seperate the channels. This can be nice as OIII tends to be weaker for instance and by boosting that separately, you can change the outcome in the end. It gives more control basically. Ha-OIII color might be the same as just a normal CFA and it would then just be the label indeed, not 100% sure, but I think that's the case.