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|    sci.optics    |    Discussion relating to the science of op    |    12,750 messages    |
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|    Message 12,030 of 12,750    |
|    Phil Hobbs to All    |
|    large lenses for 365nm light    |
|    17 Apr 15 06:20:14    |
      From: pcdhobbs@gmail.com              That's a hard problem if you want both good image quality and good image       brightness.               (There's a reason that projector LCDs are small.)              One approach to improving brightness would be to arrange the light source so       that it's already converging as it passes through the LCD, and use a smaller       lens. That's how old school overhead projectors work. The usual method is a       large Fresnel lens        placed just before the object (the LCD).              But unless the lens is like 10 feet from the panel, you'll probably be       disappointed with the image quality from a quartz singlet.               Improving image quality is more of a job. You might be able to find an old       view-camera lens on eBay.               What are you trying to accomplish with this? From the wavelength, it sounds       like something with UV epoxy or I-line photoresist. 3D printing, maybe?              Cheers              Phil Hobbs              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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