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Black Diamond ED80 V's 100
A friend is puting together a dreamlist for her schools P&C and she has mentioned getting aSkywatcher Black Diamond 100 which is an f9 or an 80 f7.5 on an HEQ5. If she ultimately wanted to do some deep sky photography would the 80 be better than the 100 due to the faster ratio or does it not really matter?
Mark
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