On Mon, 10 Dec 2018 07:43:48 -0800 (PST), StarDust
wrote:
In fraction one can use proximation, like the closest to .835 is
27/32 = 0.84375 or +1/32 away is 7/8 th!
I think, a carpenter, cook or plummer don't care about 1/32
difference? LOL!

Actually, 167/200 is even closer to 0.835 since it is exactly the
same. You cannot get closer than that...

If you care about a 1/32 difference depends on your demands of
precision. A cook may not care, but a precision mechanic will care.
If there's a mismatch of 1/32 cm between your eyepiece and your
eyepiece holder on your scope, you may be unable to insert your
eyepiece.