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For astrophotography with an untracked dob, you don't need to worry about the long-exposure mod, as you won't be doing long exposures.
You'll be limited to short exposures for the moon and planets.
But Bob is right, even a new SPC900nc plus adapter, plus IR filter is probably reaching around the $200 mark. A new DBK which comes with the filter and adapter is under $400 last time I looked.
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