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Do I need IR Cut filter for Mak-Cas DSO imaging?

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#1 Agreegator

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Posted 24 October 2021 - 08:25 AM

I have been imaging DSO objects, mostly smaller galaxies, very low mag stars, binaries, one or two Quasars etc with my 150mm MAK Telescope. 

 

I recently bought ASI 294MM Pro and while its giving me amazing results and has cut imaging time by a factor of 4 - 5, the star bloat is becoming a big issue with increased sensitivity. I am not using any LRGB filters as I don't care about colours, But I am confused about weather a MAK suffers with IR star bloat or not ? If yes then I'd want to use IR cut, but if not then I don't want to sacrifice IR signals by cutting them out.

 

Since a MAK has both meniscus + Mirror ... how does it treat the IR? Can it focus IR +RGB at the same point, like a reflector ? Or is it like a Refractor which cannot focus UV/IR with RGB and thus needing an IR Cut filter ? I'm very new to Mono imaging so my apologies if my understanding is incorrect.

 

My atmospheric conditions are quite bad at the moment so testing the images with/without IR is not helping me out identify which result is better. I'll really appreciate if anyone with experience can guide me please.

 

Thank you. 



#2 Jared

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Posted 24 October 2021 - 09:04 AM

The Maksutov design generally has extremely low chromatic error. I wouldn’t expect you to need an IR cut filter.


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