Astronomic L3 as UV/IR filter?

[900SL]

Hi 

I have a 533mc pro and it needs a UV/IR cut filter. I already have an L3 filter and was planning on using that, to pair with a TS 72 APO doublet.

It's the hardest of the three filters in terms of cut, clipping a bit more from each end of the bandwidth. Would I lose signal at the Ha end using this or is it a good match with the FPL53 doublet? Likely bortle 3-4

[900SL]

[The Lazy Astronomer]

27 minutes ago, 900SL said:

Hi 

I have a 533mc pro and it needs a UV/IR cut filter. I already have an L3 filter and was planning on using that, to pair with a TS 72 APO doublet.

It's the hardest of the three filters in terms of cut, clipping a bit more from each end of the bandwidth. Would I lose signal at the Ha end using this or is it a good match with the FPL53 doublet? Likely bortle 3-4

Ha is 656(.something)nm, so you won't lose any Ha signal (well, a tiny bit because L3 has ~95% transmission at that wavelength, but it's inconsequential).

It should be a good match for your scope; being a doublet, it won't be perfectly corrected at the extreme ends of the spectrum, so cutting them off should produce less bloated stars - I use the L3 with my triplet.

[900SL]

Thanks LA, I was hoping that was the case. Many thanks