Hi MW,
Congrats on the new purchase! that will last you for a long time!
I wouldn't worry too much about the 30mm it will give a wider view and in a dob that's handy as you don't need to nudge it as often.
you may not be able to reach focus with a dslr, but someone on here should be able to help point you in the right direction of what modifications you can do to make it happen. It might be a case of moving the mirror up by replacing the screws with longer ones.
Cheers,
Rusty
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