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

Recent content by Sylvandale

  1. S

    Opticron ED/HD/VHD glass and coatings - very confused!

    Looking around at used binoculars, I've been trying to understand the various letters used by Opticron to denote their mid- to upper-end models over the last decade. There are: ED, HD, HD+, VHD and VHD+. I'm not especially concerned about the finer technical distinctions, but just whether the...
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