"My GOD, It's Full of Stars!" For the Obser: Atlas EQ-G w/moded SN8,JMI moto-focus, flocked tube,custom mirror cell.ED80 w/ACCUFocus,SSAG,DSI,EZ Guider. Modded Canon T1i,Pentax K-5II. For the field:14" Orion 14xxi,Flocked Tubes,Custom Paint,6 Fan Cooling,LED ground board lighting. Celestron CG5GT for film/digital photos w/EZ Guider, Atlas EQ-G w/an ES102ED/AT72 Piggy backed,EZ Guider. Various 1.25 & 2" Eyepieces.
Quote:As Skygzr said -- Best advice is to simply test it yourself. You don't need long exposures, just 30 sec will suffice. You just wanna see the edges of the field to make sure the stars are tight and sharp. With several higher end lenses you can shoot wide open, but other less expensive options need to be stopped down a bit for good performance. The only way to really tell is to try it.
Quote:You can go 8mins no problem, since your guiding. I do it all the time with my 450D, even this past summer when the temps here were in the 80's. Check my image of the Veil Nebula on Flickr.
hiro Canon EOS 5Dmk2-sp2 by Seo san Takahashi FSQ-106ED with reducer, extender, and "hiro design" off axis guider, version 2 Lenses by Nikon, Leica, and Zeiss Takahashi EM-200 temma 2 jr / Kenko Skymemo-R Starlight Xpress Lodestar Autoguider http://www.flickr.com/photos/hiroc/