Any thoughts on whether Celestron's OAG (#93648 with #93562 adapter) or Orion's TOAG (#05531) would be better to use with a 9.25" EdgeHD? The Celestron looks more solid and has a larger prism, which I think would result in more and brighter guide stars. It also has a helical focuser for the guide camera, which the Orion lacks. The Celestron OAG, however, is considerably more expensive than the Orion TOAG. Also, while the Celestron will work with my DSLR at f/10, it is too thick (29mm) to use with my f/7 set up, which has only 19mm of backspace to spare between the AP reducer I use and the camera. The Orion TOAG, with some tinkering with spacers, I think could be used with both f/10 and f/7 setups. Then again, when imaging at f/7, my little finderscope guider does just fine. Either way I go in terms of an OAG, the guide camera will probably be something like a QHY5L-II or Lodestar. Thanks for any help.