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If you have any interest at all in doing photography with your Dob,
ask the salesman if you can take shots at prime focus with the scope
he's trying to sell you. Many Dobs will not come to prime focus.[Skywatcher ones do]. Some buyers have been caught out by this, not
interested in photography at the time of purchase, but change their minds later, only to find that their scope is not suitable.
raymo
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