I have a Losmandy G11 and also just picked up a Zeiss 63/840. I was looking for a saddle that could accommodate the narrower Zeiss dovetail, but still allow me to use standard Vixen and Losmandy dovetails. This saddle does it all and is a seamless replacement for the OEM Losmandy saddle. I think this saddle should be an industry standard since it works with everything, even Astro-Physics. This is an excellent idea and made very well by ADM. Thanks for the solution.