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

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  1. J

    New spotting scope from KOWA

    Hi John, yes, the old TSN single digit fluorite doublets from Kowa as well as the Tak FC series are Steinheil doublets. The optical disadvantage is small but measurable - that's why they went to Fraunhofer when they had the coating technology for the FS series. The new FC series are once again...
  2. J

    New spotting scope from KOWA

    Hi, any well made f7.5 fluorite or better ED (FPL53 et al) doublet will be just fine up to 120mm aperture at least. Ask any owner of the plentiful chinese f7.5 FPL53 doublets up to 120mm or Takahashi FC or FS series doublets on the premium end of the spectrum which are around f7.5 to f8 for the...
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