The GXR system is developing as we speak, and new lens modules are currently under development, so I can only discuss what is available now and its relevance to digiscoping. As more lenses become available - I will add them to this website.
Currently the S10 24-72mm lens module is the best choice for digiscoping, although a wide angle lens which does produce vignetting at the widest setting, after applying optical zoom - approx 2.5x (will vary with spotting scope models), vignetting can be completely eradicated.
Using my Olivon T-84 EDO spotting scope - I connect the Ricoh GXR using the Olivon universal camera adapter - and after a few seconds of lining up, I'm good to go. The S10 does use an optional clip on 43mm filter thread adapter (HA-3) so in theory you could connect this to a DSLR style digiscope adapter for a more solid connection, but currently an adapter of this type is not yet ready for the New T-84 spotting scope. Check back soon as this new bracket is imminent.
The S10 unit produces great results - the lens is very sharp and combined with the excellent optics of the T-84 - I'm getting some of the best shots I've ever taken.
The GXR camera body is packed with all the features that you would expect from a serious DSLR camera - making it a great digiscoping tool - flexible shooting options and total manual control allow you to set the camera up in a way that is beneficial to the digiscoping method. Add to this an ultra sharp 920,000 3" LCD screen, RAW shooting and a range of accessories - this camera is a joy to use, not only for digiscoping - but for all aspects of photography. With a 28-300mm lens unit on the way, adding to the 24-72 S10 and 50mm Macro A12 module, the compact size of this system and superb optical quality, makes me question if I'll ever use my DSLR set up again.
The build quality of the GXR is second to none - with a solid, professional feel, once you turn on the camera and access the menus on the ultra clear 3" LCD screen you know that this is a class act. Functions are very easy to access and a new useful direct button gives you instant access to set-up information. I also love the 'my 1, 2 and 3' functions, allowing me to save my digiscoping settings in to the camera memory, making them accessible with turn of the main function dial.
We've all got our own methods and preferences when it comes to digiscoping - but all I can say is - if you're serious about your digiscoping and photography - check out the GXR - it's vast array of functions and settings along with it's optical quality, should accommodate the most demanding of photographers.