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

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    Redpoll - common vs lesser - UK

    Saw a group of redpolls this morning in Oxfordshire, UK - a few photos and sound recording attached. Confused on lesser vs common distinction (sound leading me one way, and visuals the other...) Also are these distinguished at the species, subspecies, or variety level - have seen conflicting...
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    Help with ID on juvenile gull

    Seen yesterday in the Thames just south of Oxford, UK. Bigger than a black headed gull shown for comparison in second image (sorry wrong bird in focus 🤦‍♂️). Last couple of images show bird landing with underside of wings visible, and pale dull pink legs. TIA
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    Lens length for afocal digiscoping with APS-C sensor DSLR

    I have a endeavor HD 82A scope, and am thinking of getting the PA-202 adaptor for digiscoping with a Nikon APS-C camera (D5300). Presumably a fast fixed focal length camera lens would be the better way to go, with zoom available via the eye-piece on the scope, but... What lens length on the...
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