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

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  1. T

    please recommend

    The first number is the magnification and the second the diameter of the objective (front lens) in millimetres. If you divide the second number by the first it gives you something called the exit pupil which is a guide to how useful they will be in low light. An 8x25 would be 3.125mm and an...
  2. T

    please recommend

    I'd agree with Peter that the Viking is excellent value at the current price. An old favourite here is the Olympus PCI 8x25 reverse porro. Small and light and can be found for around £60. Porro models like the Nikon Action EX are very good for the money. Uttings has the 7x35 at £90 and the 8x40...
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