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

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    Hawke Sapphire ED or Frontier ED-X ?

    I'm unclear myself, but I'll offer a bit of speculation. At various time on the forum I've seen "fish-bowl" or similar terms to describe too much pincushion, too little pincushion, and quite frequently, high levels of field curvature. I wouldn't have said the Sapphire ED or indeed the Frontier...
  2. T

    Hawke Sapphire ED or Frontier ED-X ?

    The outgoing dual hinge Sapphire ED appeared to have slightly less peripheral distortion than the single hinge version, but the latter was shorter and lighter and more to my taste ergonomically. IPD might make a difference. The ED-X seems to be a simpler optical design with more field curvature...
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