Quote:
Originally Posted by atkinsonr
Dob's are pretty simple. If it's in good cosmetic condition, hasn't been mistreated, no dings or scratches, just check the focuser and mirrors.
The focuser should be clean and smooth - not gritty.
The mirrors (especially the primary) really should be faultless, show no signs of dirt or having been cleaned, or having anything dropped on the primary.
A few flecks of dust is no problem at all.
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I agree with your points except that the primary should show no signs of having been cleaned. It is reasonable maintenance to clean the mirrors when needed. It has to be done with care, but many consider it essential to get the best performance from the telescope. So far I have only felt the need to clean my primary once and the improvement was worth the effort.