Photovisual star diagonal

Claim 1

A photovisual star diagonal for use with telescopes to simplify astrophotography, comprising: a body having: a front end; a rear end; a top, and a cavity extending from said front end to said rear end of said body and through said top of said body; first coupling means positioned near said front end of said body for attaching a first optical device thereto for viewing through said cavity of said body along a first axis; second coupling means positioned near said rear end of said body for attaching a second optical device thereto and orienting said second optical device for viewing along said first axis; third coupling means positioned near said top of said body oriented substantially perpendicularly to said first and second coupling means for attaching a third optical device thereto for viewing through said top of said body into said cavity of said body along a second axis oriented substantially perpendicularly to said first axis; first adjustment means for adjusting the distance between said third optical device and said first axis; a multi-position mirror positioned inside said cavity in said body and oriented so that when said mirror is in a first position, viewing from said first optical device to said second optical device is substantially unimpaired, and when said mirror is in a second position, a viewing path is established between said third optical device and said first optical device; control means for changing the position of said multi-position mirror from said first position to said second position and from said second position to said first position consisting of a rod to which said multi-position mirror is attached which has at least two flattened areas and a knob to facilitate adjustment of said multi-position mirror; locking means for holding said multi-purpose mirror in said first position and in said second position consisting substantially of a spring-loaded contact which contacts one of said two flattened areas; second adjusting means for adjusting the position of said multi-position mirror with respect to said first axis, and third adjusting means for adjusting the orientation of said multi-position mirror with respect to said second axis.