Just wondering if you ran the batteries in you calculator down doing all that math.... LOL
Even if you did the above is another GREAT post from you....
However I not really that sure at what point a Focal reducer fails to be effective (or offers anything worth the effort) ...I seem to remember reading that one gains nothing if you use one with any possle eyepiece less then 12 mm.
I just do not know...
Bob G.
-------------------- CPC1100
Nexstar 8i + GPS & Rays Brackets
Denk S1 power switch
Orion 100 mm Refractor
Meade LXD 55 ...AR-5 127 mm Refractor
Exploradome Observatory S.I.E. (Smiling Irish Eyes)
Gerbring Heated Motorcycle clothing in the winter