Hi experts
I'm a triplet refractor user but only I image with a DSLR (Pentax K3-II) so my images are a bit on the meh side. I was speaking with a narrowband images who told me that a Ha filter can actually work on an unmodded DSLR (if you take sufficiently long exposures) and the results when blended back in with the DSLR's image look pretty good.
My question is how would I do this? Where would the filter go? I've got a focuser that ends in an M68, going to a flattener that ends in an M48, which goes to a home-modified Pentax t-mount. The t-mount has no spare length in the train due to insufficient back-focus from the flattener, so I can't put a filter there. Is there anything I can do? Anywhere else I can put a Ha filter?
Or am I going to start asking for beginner-level CCDs in the second-hand equipment section?
Many thanks
Bill