Olympus PME metallograph objective specifications needed

Hi All,

Jeff from metallography.com recommended I check out your group. I'm
looking for a 50x objective for an old Olympus PME metallograph. (Not
the newer PME3). We do not have a manual, and from what I can tell
from the markings on our current objectives, I don't have enough
information to know what to specify.

5X (red), 402165 Olympus Tokyo, Mplan 5, 0.10 Japan
10X (orange), 402079 " " " 10, 0.25 "
20X (yellow), 401931 " " " 20, 0.40 "
40X (green), 403100 " " " 40, 0.63 "
100X (blue), 401313 " " " 100, 0.90 "

I'm not really a microscopy guy (hence my posting), but it seems like
I'm missing the key info - the distance?

Does anyone know what I need to spec out for real, or does anyone have
a copy of a manual they'd be willing to fax/email/sell?

Thanks,

Jon

.