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

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  1. B

    Wondering about Ultravids, esp. 12x50...

    This morning at 8 a.m. I looked at a crow sitting on a chimney pot at 120m. Using a 2007 original model 12x50 Ultravid I did notice some CA, possibly purple on one straight side of the crow against a clear blue sky in bright conditions, handheld. The other side I didn't notice it, maybe more...
  2. B

    Wondering about Ultravids, esp. 12x50...

    It depends what type of resolution. Because the 12x50 Ultravid shows more stars, the brighter ones are bigger. So separation of brighter stars may be less good in the Ultravid than say a cheaper 12x50 with smaller stars. To separate Mizar at 14.4 arcsecond double star the best situation is...
  3. B

    Wondering about Ultravids, esp. 12x50...

    I just tried the as new 2007 Ultravid, not a modern version. I don't use it often. On axis there is no CA that I can see. However, by 50% to the edge there is CA, which is more obvious near the edge. I like the pincushion distortion, I hate distortionless eyepieces, they make me seasick as...
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