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Message: <blockquote data-quote="WJC" data-source="post: 3659397" data-attributes="member: 25191">Hi, Maljunulo:The answer was all in the first sentence of my previous text. That was the doctrine. In practice, the human aspect can’t be removed. Even with that anomaly, the results are perfectly acceptable ... for all PRACTICAL purposes. I explained all this last night. However, as with so many posts, I was almost done when the whole thing just disa—darn—peared. I realize that many of those who seek complex solutions to non-existent problems will find fault with my answer. Yet, in the real world it will suffice.Also, “Zero Diopters” applies to only ONE telescope at a time.I hope all had a great Christmas! The weather was great in the Phoenix area. However, I will deal with the snow in Twin Falls just to have my own bed back! :cat:Cheers,Bill</blockquote>