I've picked them up at 11.5 photographically with the Sony by shooting the known field. At about 10th mag. I can start seeing them in the EP (120mm refractor, 40mm EP). Maybe I'll go for this one.
The camera is a fun way to search for asteroids and comets that are below the mag. limits of the human eye. Give it a try!
Comets:33, Best Meteor shwr: Leonids '01, Best Aurora:Oct. '03.
Total.Sol.Eclipse,7/10/72 from Nova Scotia.Annular Sol. Eclipse '94,
Trans.of Venus 2004&2012.,ShoeLevy crash into Jupiter '94.
4/25/66 fireball, 30sec,15min trn,-9 mag.,SN2011fe,N2012aw.