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Short and sweet: I've seen image erectors that use one lens and I've seen image erectors that use two lenses. I've never seen an explanation of their merits. What are the pros and cons of each system and which applications would you use them in?

I probably should have included an illustrative example of what I'm talking about. I didnt realize my technical knowledge was so sub par. Say I have an instrument that measures with an error of plus-or-minus 2. Then when making a measurement, I get a value of 100. According to the...

I'm preparing to do some statistical analysis that relies on instrumentation with a known ±%, specifically optical chronographs and pressure gauges. My question is on how the measurement values are distributed across the error range: is it random or is normally distributed? The method of...

In my research, most manufacturers seem to list a pressure regulator's accuracy in terms of a percentage of the target output pressure. So a pressure regulator with a 1% accuracy set to 100psi will only be +or- 1psi whereas the same regulator set to say 500psi (for illustrative purposes) will be...