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

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  1. B

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

    The chart below is the one I've been using for all my binoculars. I'm thinking of setting it 100 yds away first to test the 30x and 75x eyepieces of the ED82 and then keep moving it further maybe 50 yards at a time until I can't resolve the vertical lines top and bottom at the ends. That...
  2. B

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

    Thanks Peter, I'll do some reading about the RCTR that you mentioned to understand and test my scope.
  3. B

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

    I have one of those charts that I use for my binoculars but is there any benchmark as to what I should be resolving at around 100 yards at 30x and 75x? Right now the only benchmark I have is that my friend lives over 1/2 mile away and told me to spot his house and tell him what I see, so I did...
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    ED82, any chart to test if the optics are a good sample?

    Been thinking about this for awhile. Has anyone come up with a test chart to test lets say the 75x DS fixed eyepiece and the 30x DS eyepiece to determine if the sharpness is on the higher or lower side of the scale as I've read here often about sample variation?
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