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EQ2 exposure length?


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Am after a little advice please.

I've only recently decided to dip my toe into this hobby and whilst saving for a telescope I built a barn door tracker. At 50mm I could manually get 20 seconds consistently. I was looking round for a motor when a Skywatcher 130 on an eq2 mount fell into my lap. Have decided to get the motor drive for this as I'll be viewing with the kids.
My question is; if I piggy back a DSLR on top of the scope with the motor drive how long an exposure could I expect at 50 - 100mm?

Thanks in advance.

Graeme

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