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I upgraded to 2" refractor and I'm thinking now to use it for some photos with my Pentaxes (including Q). Will it make sense to get UV/IR cut filter? This is just an achromat, so not corrected at all for both but the DSLR and mirrorless should have it's own filter...

You only need the UV/IR cut filter if you've astro modified your camera. This is because otherwise IR will show up in the image. You may ask why modify the camera then, its to widen the spectrum to include Hydrogen Alpha (Ha) but it still has to be limited in the IR.

Thank you very much!