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Peter,
Your 071MC only has an AR window ( no IR cut filter ) which is fine for imaging with reflector telescopes
However if your imaging with a refractor I’d recommend you buy an IR cut filter for RGB imaging
You can image narrowband with your 071MC so will need a Duoband or multiband filter
I use an Optolong L Exteme which is insanely good ( look at my images in Deep Space section using the L Extreme )
If your imaging narrowband with a refractor, I’m not sure if you need the IR cut filter and the narrowband filter as my 2600MC already has an IR cut internal
Maybe others can advise ( I don’t image with refractors on reflectors )
Narrowband filters are mainly used for imaging Emission Nebula under moon light skies or light polluted skies , I use mine in both Bortle 8 and Bortle 3 with or without the moon and get incredible results
The narrowband filter only allows certain wavelengths of light through to the camera sensor , namely Ha and Oiii
The L Extreme passes 7Nm of Ha and 7Nm Oiii which is excellent
Maybe others can help in regard to IR cut and Narrowband if you image with a refractor ?
Cheers
Martin
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