KL27x, very interesting/good point... makes total sense as well. They also need to distinguish between the parts, but sine they are both good, likely didn't want to one to sound negative or something, so simply highlighted the parfocal functionality more in the one (or maybe it is a bit superior in that regard). Either way, thank you for reminding me that these titles are more marketing than specifications, plus not like the SM-4TP says "non-parfocal".
Well guys, looks like I have circled back around, and likely just gonna go with the SM-4TP, or SM-4NTP (still wanna talk to their sales rep to get a full explanation of the differences there). The advice has been great, and glad I looked around and had you guys explain the benefit of the one that was originally recommended. Otherwise, I may have bought it, then saw the articulating arm stand for about the same price, and been really disappointed... this way I am aware of the options, and making the choice for good reasons.
My plan is to make it through black Friday... maybe even "cyber monday" or whatever the new marketing gimmick is... and see how much I end up spending those days, to decide whether or not to order the microscope right away, or wait a few more weeks to a month or so. OR, maybe it'll go on sale at some point over this extended weekend, in which case, it'll be a win for me.