Digiscope adaptor

Does anyone use the Pentax PF-CA35 digiscope adaptor, currently £299.00? Recommended for use with the Pentax 80 digiscope it is a lens which replaces the eyepiece. Question is what equivalent telephoto lens would that represent, and how are the results?

No but I have digiscoped birds with various cameras and my Swarovski scope. This Pentax product is simply a fixed aperture (f12.5) adaptor to connect your DSLR to the scope. This is not tecnically digiscoping.
See here: http://www.pentaxforums.com/forums/29-welcomes-introductions/282034-digiscoping-...
You would need a very stable and sturdy tripod with a balance rail because the set up will be back heavy. I'm not sure the results would be that great.
Microglobe have a price of £179 when in stock

Thanks for this, from links the results aren't that sharp and I would be better off with the 150-450 zoom and cropping. I saw the Swarovski digiscope setup at Birdfair last year and they seem to have it really sorted.

You are very welcome. I agree that you would be better off with the Pentax lens or perhaps the Sigma 50-500 or 150-500. Most birders only digiscope for 'record' shots for i.d. purposes. More serious photography is the preserve of the DSLR. A 500mm focal length is only the same magnification as 10x binos but cropping does the trick.