At 09:49 PM 6/26/2008, TMorton wrote:
Looking to buy an Optivisor over the internet but not sure what
power to get...I usually wear 1.50 or 1.75 cheaters to read...any
suggestions for what to get to be able to solder those itty, bitty
Elecraft parts?
FYI - usually the number represents Diopters, which is the unit used
to express the power of a lens. It is the reciprocal of the focal
length expressed in meters.
A lens with a diopter of 10 would enable your eyes to easily focus at
1/10 meter (3.9 inches). One with 5 would work well at 1/5 meter (7.8
inches), etc.
Jerry W4UK
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