When you go to the eye doctor, you look at a chart and tell them what you can see. It's the same way for the cameras on spy planes — but their charts have to be big enough to see from 20,000 feet.
The latest Duclos spherical focus chart, Spherical V4, introduces some handy new features. There is definitely going to be a gap in the market when DSC Labs closes down, even though companies are ...
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