Thanks Erick and Doug
My eyesight is quite ordinary, nothing special!
Re MCG-05-33-005, Steve Gottlieb estimates the mag at around 15
http://www.astronomy-mall.com/Advent...ace/ic4329.htm
Max visual limit for a 10" is often given as 14.8. With my flocked tube and dewshield, the galaxy's location virtually at the zenith and good transparency, 15th mag is possible IMO. It's tiny size would almost certainly imply high SFC brightness so perhaps that is the determining factor in its visibility at the eyepiece. Assuming it has a V=15.0, its SFC could be in the 14.5 range. In any case, there was definately the
faintest possible haze wavering in and out of vision off the SW edge of 5291!