can i use my quark with a prism

[xtreemchaos]

I'm wanting to use my quark with my f5 120mm frac, but also want to keep using my 50% reducer so I get larger panes but my 2inch TV wedge don't give me enough inward focus , I don't have a 1.25 wedge just prisms would this be ok, ive search the web but carnt find anything about it. I would be using with a uv/ir cut filter screwed into the prism.  charl.

[Merlin66]

Prism diagonals don't like fast f ratios, it can give rise to chromatic effects.

may not be as objectionable when considering Ha but I'd say a 1.25 mirror diagonal would be better.

 

[michael.h.f.wilkinson]

Why not just use an extension tube, rather than a wedge or diagonal?

 

[xtreemchaos]

thanks Merlin, I was thinking about that mate CA shouldn't be a problem. charl.

[xtreemchaos]

thanks Michael, because I switch from cam to vis a lot "clouds permiting" its a bit of a bad angle to be doing vis, and daystar recommends using them upright with a wedge, charl.