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Gosh Tel....

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.

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Hi Bob,

Thanks for you kind comment. That took a while and I still got it wrong ! It wasn't a calculator though: the beads fell off my abacus !

Anyway, I've made a fresh calculation relating to the use of the Zoom on an 8SE with a 6.3 FR. Please take a look above if you wish.

For my part now, I'm off to bed. I've been testing some new imaging software outside tonight, ("Nebulosity") and it's now coming up to 2:15am. Needless to say, I'm bushed !

Best regards and good night to all !
Tel