Even if "in" travel is needed, all you have to currently do on the Grim is remove the 2" diagonal. That gives you 40mm-50mm of in travel, and eliminates 25% of the throughput loss to reflection. The view is reversed left-for-right in that instance, but that's not a problem. Just like viewing through a SCT with a star diagonal. Easily corrected on the computer. On Mon, Jun 8, 2009 at 9:49 PM, Patrick Wiggins <paw@wirelessbeehive.com>wrote:
If in fact you can achieve focus I did have adapters made a couple of years back that fit in the Ealing, refractor and Grim scopes' draw tubes and onto which accessories can be threaded. But those were made in the days before Bruce moved the Ealing and Grim primary mirrors (see my post from earlier this evening about that) so they may now work only in the refractor.