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Message: <blockquote data-quote="UTCbirder" data-source="post: 1462069" data-attributes="member: 65449">Well this is really good info;  i now have rechargables set into the 30.  dont recall the brand but i think it's energizer.  am interested when i get home to see if i can extract the little buggers.  have never had a problem w/ the 42's.checked out the handling and size of the 12X36's, and optically and cosmetically they seem to be clones, very similiar view but close focus is way too far off for the kind of birding i do.  think i will skip these in the line, but am looking closely at the 15's for long range shorebirding, and esp for the local hawkwatch this fall.contacted Canon service today about the "dont take them to high mountains/bubbles in the prism" caveat and the original tech seemed not to have fielded the question before.  was put on hold while she spoke w/ a "sr tech", whose response was something to the effect "avoid quick changes in temperature or pressure;  it's not so much the extremes that matter, but rapid changes in pressure that could generate air in the prisms".  that's a loose quote, but the concept does make sense.  however i got the impression it's a sort of off the cuff answer, but, then again, maybe not.  idea i suppose then is not to stash them in a plane's cargo hold,  which i had no intention of doing anyway!  i dont have the manual in front of me, but i do seem to recall the wording here might truly indicate "not to take them to high mtns", period, as opposed to rapid changes in air pressure.  anyway, they promised to check even higher up the tech chain and if anything else comes up they are going to email that info.  they also promised to look into the wording in the manual.</blockquote>

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