1. Orion thin off axis guider
as seen here
http://www.bintel.com.au/Astrophotog...oductview.aspx
Only used once-(with SSAG) - $200 including post
2. William Optics Flat 6A- reducer corrector 0.8 for GT10 scopes and EOS cameras. see here
http://www.williamoptics.com/wo_shop...product_id=649
I believe I used this also on my GT 81 without an issue.
$150 including post.