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

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    To Infinity, and Beyond

    Good afternoon everyone, Can binoculars focus closer if I wear reading glasses? Let me explain. Many binoculars focus beyond infinity if a person with “normal” vision racks them right in. This, I understand, is so that folk with short sight, who have no astigmatism and a relatively moderate...
  2. D

    Close-focusing alpha field glasses

    Hello everyone, May I introduce myself; defend (or at least explain) my use of “alpha” field glasses; and ask some questions about using field glasses for both birds and butterflies. I’m a retired mathematician and amateur musician who goes (not nearly often enough) onto the Downs of...
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