Focus length rather focal.
Its mm not MM. "Both
MM and M are used for million. The
MM is used widely in the oil and gas business; it stands for "a thousand thousands".
from
https://www.quora.com/What-should-be...illion-M-or-MM
At its 20x/30X/40X rather than the hundreds.
I'm annoyed I missed reflector on the box!
Philip