This looks a great site to work out the mag etc for your EP/scope
http://www.telescope.eyepiece-calculator.co.uk/
Info for my scope and 27mm Panoptic -
FL - 27mm
mag 44.4 x
Eye relief - 19mm
Barrel - 2"
AFov - 68'
Tfov - 1.53'
EPupil - 5.7mm
Fieldstop -30.5 mm