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Well,
A few of the don'ts for the noobs:
1. Don't use aerosol insect repellants anywhere near the scope - especially upwind of it - this stuff will permanently damage optical coatings. Same applies to your eyepieces.
2. Don't attempt to clean a fluorite objective with liquids starting with water, you'll probably wreck it.
3. Don't attempt to disassemble the objective to .. ahem.. "improve" it. You'll almost certainly make things worse.
4. Think carefully before you fiddle with crayford focusers, lost of fiddly bits to reassemble that probably won't work as well after you've messed with it.
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