Archived posting to the Leica Users Group, 1999/08/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]>To Marc and Mark, >Some things die hard don't they? There is nothing wrong with plastic >eyeglass lenses. Why would anybody want to walk around with twice the wait >sitting on their nose. I know that both of you won't beleive it but they DO >NOT scratch. Oh, maybe if you take a scew driver and drag it across the lens >but the gentle rubbing against a brass viewfinder will leave nary a mark >(oops) scratch. >Steve >Annapolis They scratch. Glass glasses scratch. Plastic eyeglasses scratch faster, at a rate depending on the plastic and the coatings. If I use a camera a lot that doesn't have a rubber rim around the eyepiece I can hardly see out of my right eye (shooting eye) in half a year wearing the hardest plastic lenses I can find. With glass they last twice as long. The weight difference is slight, since the refractive index of the best plastic lenses is not as high as that of the best glass lenses, so the glass lenses can be made thinner. Still, I wear plastic lenses as I go into a lot of construction sites, and play sports where stuff can fly at my eyes and the (lightweight) glass lenses would easily break. I definitely cannot afford to lose my sight. * Henning J. Wulff /|\ Wulff Photography & Design /###\ mailto:henningw@archiphoto.com |[ ]| http://www.archiphoto.com