The 14mm has no capability for external "normal" filters, but the 135mm will accept 77mm front screw in filters and you might use a suitable uv/ir cut or possibly other light pollution filter (Redhancer, UHC, dual narrow, if you can find one, etc...) to suit the full spectrum.
Alternatively you could try an in body clip in filter for Nikon APSc.
Best
JA
Last edited by JA; 25-01-2020 at 05:50 PM.
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