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

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    Best Low Light Binocular?

    LGM, The average low light pupil maximum for 60 year olds might be between 5mm and 5.2mm in the various studies I've seen but there is individual variation as others have been keen to point out. ;) Most individuals will fall in the 4mm to 6.6mm range but there will be outliers. Knowing your...
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    Best Low Light Binocular?

    For those who haven't read Holger's paper or, like me, haven't checked the original work of Zeiss and Leica scientists they address the issues that acuity and contrast discrimination decrease with light level and their relationship with age. While there is much individual variation, typically by...
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    Best Low Light Binocular?

    LGM, It's not something we can give you a straightforward answer to without knowing your definition of low light, your maximum pupil diameter and the size of the objects you are wishing to observe. Generally an 8x42 will fulfill the needs of most middle aged birdwatchers but a 10x56 will...
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