G2b2,

Thanks for responding. I appreciate the good advice.

I'm considering buying a different eyepiece. Could you or someone else recommend a decent economy model with better relief and wider field of view? I found one, pic below, which will fit (23mm) but is it one that will accomplish what I looking for?

I must clarify something. When talking about Montezuma's revenge I guess "pool water" could take on new meaning. In the early part of last year we bought and moved into a home with an existing pool

Since my bout I've had the pool refinished and refilled with fresh water but if I've had a problem before, providing the previous occupants weren't the only source of contamination, I could have a problem again. These possible sources include ground runoff water contaminated with animal waste and birds doing their business overhead.

Thanks,
Bob

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