<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by C.R.Sam:
think we're gonna lose a little at each surface of each lense element (complicates the math), then we gotta get er off with less than plus or minus one tenth of a minute of angle azimuth error to go along with the elevation calculations. Damn good gear, damn good user and lots o luck. Course the more you do, the luckier you get more often.[/quote]
Sam, lose a little what with each surface of each lense elements? Apparent size? Are you talking about refraction effects in the glass?
If he's got a good scope he shouldn't have to worry about it for something nearly an arcminute in height (as 16" from 1880 yards is.)
If you just mean distortion in the shape of the target that too ought to be well within the tolerances of a good refractor at that size and range. True, these effects get worse as the object moves away from the center of f.o.v., as it would have to to elevate the barrel. But if the objective lens is reasonably wide this shouldn't be important. But is this what you're talking about?
If you're talking about dimming or contrast problems or something that too should be all right too depending on the background (but I don't see how this is something one would do any calcuating to compensate for anyway).
