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

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  1. H

    Harpia 95: A Review on a Scottish Island

    I’d like to apologize to Lee for my post #52. That was an impulsive expression of irritation that I wouldn’t have posted if I had sat on it for a few hours. I wouldn’t object to having it and all the related posts that came after it deleted. Perhaps it still needs to be acknowledged that there...
  2. H

    Harpia 95: A Review on a Scottish Island

    Lee, Here our optics testing philosophies diverge to the maximum. If I were handed a Harpia as a black box, told to use it for three weeks without the benefit of a reference scope of comparable aperture and known performance, and then forbidden from conducting any basic objective optical tests...
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    Harpia 95: A Review on a Scottish Island

    I thought that this idea was probably a bit optimistic from not taking into account less than ideal daylight conditions, so I constructed a real world experiment to test it even before I saw the Harpia. I made a 50mm stop down mask for my 90mm Takahashi Sky90 combined with a 25mm eyepiece to...
  4. H

    Harpia 95: A Review on a Scottish Island

    Peter, Good advice from Lee there. Could be that your post is a tad too quick to accept some enthusiastic early and subjective opinions of the Harpia. We’re still far from a complete picture of its basic optical characteristics. In fact, as far as I know only Kimmo and I have made any attempt...
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