52mm filter with 2" focuser?

[acey]

Is there a way to use a 52mm camera filter visually with a 2" focuser? Idea is to use a Hoya HD polarising filter (which I don't yet have) with the Crayford on my Skywatcher flextube (terminating with an eyepiece). I'm assuming that since 52mm is bigger than 2" there would need to be some sort of adapter involved.

[Psychobilly]

The 2" is acually 48mm in filter sizes so youd be looking for a 48-52 mm step ring try Bristol camera centre...

But dont know how youd get the larger filter inside the focuser mech...

Peter...

[Doc]

How far into the OTA does your drawtube extend. If there's enough room before it enters the light path maybe some adapter to secure onto the end so to mount filters

[Psychobilly]

i reckon the adaptor is the first one of these...

Digital Cameras at Bristol Cameras - SLR - Camera Lenses and more

As you want to use a 52mm filter on a "lens" thread to take a 48mm one...

Peter...

[acey]

Thanks for the responses. Attaching it to the end of the drawtube sounds like the most practical solution, if I can find a way to leave the filter rotatable (i.e. not use sticky tape!). I'd need to check for vignetting though, or would possibly need to use a larger filter size (=more cash).

Reason for my interest is the suggestion that high-transmission polarisers can be used to filter moonlight for deep-sky viewing:

http://arxiv.org/PS_cache/astro-ph/pdf/0011/0011005v1.pdf