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  1. FTH

    Adding iris to a 5 element lens

    I would like to add an iris to a standard 5 element lens. My intuition says that adding this close to the front or backside will not only reduce light but also the image size. Is this correct? Does someone has a link explaining the effects or the right way to do this? Rgds, Frank
  2. FTH

    1V p-p sine > TTL signal conversion

    If you want to buy a module you can check the 'CP-1064. Sinewave Interpolator' on www.opticalencoder.com. As a more robust design alternative you could check the 'MT-series' on www.optical-technology.com For the same reason you can check the interpolator products from Heidenhain. Rgds, Frank
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