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

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  1. H

    An interview with Gerold Dobler, leader of the SF design team

    Thanks Lee, for these additions. A cemented doublet, and a focusing lens made of CaF2 - the latter may travel away from its optimum position without introducing too much of CA, that's perhaps the idea behind that. I am eagerly awaiting the arrival of the 8x42, since I am curious to use it under...
  2. H

    An interview with Gerold Dobler, leader of the SF design team

    This is possible, but not reasonable: Because the two glass elements would have different refractive indexes, light would be reflected at their contact surface. This implies that one had to coat them separately before assembly. Instead, manufacturers are using a transparent lens-cement, the...
  3. H

    An interview with Gerold Dobler, leader of the SF design team

    Hi Jerry, It seems that Dobler/Seil were forming a separate team, which worked independently and wasn't involved in the HT design (the HT does in fact look very much like a classical Victory design, while the SF is quite a bit different and closer to the Swaro EL). I am convinced that they got...
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    An interview with Gerold Dobler, leader of the SF design team

    In this case, the CaF2 element is the sensitive one and should be kept inside. Now, the "flinty" (negative) element is in front, but actually it is made of a crown glass. In other words, the "ED" element replaces the crown, and a crown replaces the flint - in this way the dispersion of the...
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    An interview with Gerold Dobler, leader of the SF design team

    Hi Lee, Just to clarify one point: The "optimum distortion" I had suggested was also based on empirical observations, namely the way volunteers perceived distorted Helmholtz checkerboards. The follow up calculations then simply tried to connect these observations with the amount of globe effect...
  6. H

    An interview with Gerold Dobler, leader of the SF design team

    Lee, thanks a lot for this interesting interview! I agree that Herr Dobler and Herr Seil have taken the challenge of a very ambitious project, and surely something great has been achieved. Most notably an increase in field of view with, at the same time, high edge sharpness, that's something...
  7. H

    An interview with Gerold Dobler, leader of the SF design team

    Outstanding, Lee! We are curious to learn more about that new wunderfernglas! Cheers, Holger
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