I know lots of you read/subscribe/participate to/in Yahoo Digital_Astro - but for those that may not and havent seen this shot.... I wouldnt normally do this but ..
if this isnt an amazing add for AP refractors and the 20Da(amongst other things) I dont know what would be!! astrophotographer Chuck Vaughn in the US
http://astrophotography.aa6g.org/Ast.../m42_20da.html
made this shot of M42 with forementioned set-up.
Cheers
Kearn
ps nice tribute to Erwin on D_A's front page
http://groups.yahoo.com/group/digital_astro/