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Hey John,
There are two main reasons why a 6.3 reducer is used, visually & photographically,
1) as mentioned by Shane - it will produce a 'wider field'
2) the scope will be 'faster' meaning, quicker exposure times, by about 30% - ball park estimate, give or take 10 %
Another advantage is, the wider the field, the less critical Guiding, Focus, Backlash etc will be, , Hence, the smaller the field, the more critical.
Is why the more experienced 'imagers' out ther have such good quality mounts !
Just my Bob's worth :-)
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