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Originally Posted by Hammerman
but the 100ed blows away the dob on planetary and lunar detail.
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Hammerman,
If this is the case there is something not quite right with your 8" dob and I would check it out or get someone else to check it out. It is either not collimated properly, not cooled properly, some induced astigmatism is present due to overtight primary mirror clips or the secondary mirror holder, a not so great mirror and the scope should have gone back to the dealer for exchange.
Some of these issues I have mentioned above will not affect the in focus images at low power or even the views of some DSO's at medium powers but they are critical for top performance in a Newtonian at higher powers used for lunar or planetary performance.
A properly cooled and tuned 8" newtonian with good optics will outperform a 4" APO on everything including planets and the moon. A good 8" newt will do it by a fair margin.
CS-John B
