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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. W

    ED82, any chart to test if the optics are a good sample?

    Apologies, but of finger error on the calculator, should be 5.5mm…. Power of 10 out… thanks to those who noticed! Peter
  2. W

    ED82, any chart to test if the optics are a good sample?

    You are looking at at how close the scope can come to the Rayleigh criterion theoretical resolution. The eyepiece will likely affect it and a higher power will help you resolve finer detail that will help determine how fine detail the scope can. Some people assess binoculars by adding multiplier...
  3. W

    ED82, any chart to test if the optics are a good sample?

    You can find resolution charts online, you could print one out and then nail it to a suitable spot far enough away for testing. You’d need to do some sums to work out what you’re expecting, so you only resolve a few of the features. Peter
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