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

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  1. fazalmajid

    Chromatic Aberration, CA, what, why, how?

    And atmospheric conditions. e.g. heat haze, although the latter seems unlikely to be a major concern in the environments Thrupenney Bit has mentioned he is going to use his scope in.
  2. fazalmajid

    Chromatic Aberration, CA, what, why, how?

    Also have a look at point light sources in the periphery. There are other types of image-degrading aberrations like coma, where points grow "hair" (coma means hair in Greek), astigmatism, spherical aberration and so on.
  3. fazalmajid

    Chromatic Aberration, CA, what, why, how?

    CA is caused by glass not having a constant refraction index as a function of wavelength, which means different colors are focused in different places. Generally the way to correct it to use glass of different characteristics, specially ED or fluoride glass. Look at stark bright/dark transitions...
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