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| Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Got any eyeglass experts here?
Trying to figure out the link between magnification and focal length.
I need glasses to be able to read and see what I''m doing clearly on my lathe but the 1.50 safety glasses I have force me to get too close to my work. Looking for something with a focal length of maybe 22" so I can stand at a comfortable position. Does that mean a stronger lense? |
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