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To Mod or not to Mod
A few years ago I purchased my Mewlon 250S which is a native f/12 scope. Takahashi have released a 3 element ED Corrector ($1100 US)contained within a replacement baffle tube assembly. This new corrector supposedly eliminates coma, flattens the field and reduce the f-ratio slightly to f/10 I think. There is also a 0.73X reducer (f/7.2) ($699 US) and 1.5X (f/14.9) ($499 US) available for use with corrected Mewlon to turn it into a Tri-Focal scope. The question is would it be a good idea to make this modification or should I leave it as an f/12 scope? I can see a lot of positives to this but is there any negatives that may be overlooked?
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