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

Recent content by Swedpat

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    Baby S

    Any new information about this binocular? I am eagery waiting...
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    New but probably wrong insight about lowlight

    This picture mixes up relative brightness with light amount. The brightness is always primary based on the effective exit pupil. With 4,2mm(or smaller) eye pupil, 8x42 and 10x42 provide equally bright image. As soon as eye pupil is larger than 4,2mm, 8x42 becomes brighter than 10x42. But when...
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    New but probably wrong insight about lowlight

    I mean that is not correct. Photons per area are already included in the exit pupil, which is based on the relation of aperture and magnification. All configurations with same exit pupil have same brightness providing equal light transmission. Otherwise 20x80 would be brighter than 10x40. It is...
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    New but probably wrong insight about lowlight

    I like this topic. I will give my try to complement. Total light gathering power is linear to surface area of the objective. Brightness is determined by exit pupil. Brightness is not to be confused with light amount/light gathering power. For example: if you compare following configurations...
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    Ocular Lens Size

    This is still very individual. Using binoculars has a similarity to shooting. You can train stability like a shooter does. But it's true that freehand can never be as stable as mounted or image stabilization. My experience is that even with 5x a support can provide the crucial stability to see...
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    Ocular Lens Size

    As I understand it that definition of eye box actually is the description of eye relief.
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    Ocular Lens Size

    Thanks. That is actually what I have thought about bit did not know a word for it.
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    Ocular Lens Size

    A question: I have read it before but have forgot to ask: what does "eye box" mean?
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    Vintage Vixen Ultima - need help

    Hi! I have had a Vixen Ultima 8x32 and bought it 1997-99(don't remember exactly). It was exactly the same color and design as your. So yours are probably from mid to late 90s.
  10. S

    NL >=50 mm versions?

    Interesting with NL 52mm models! But I don't find any information when I search about it.
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    Steiner Hunting 10x50

    I absolutely understand what you mean. I was focused on the optical quality. Is it possible to reach the point where you cannot more improve noticeable sharpness? Yes, I am sure it is. But there are several factors to take in consider. The sharpest optics in the center comes on the expense of...
  12. S

    Steiner Hunting 10x50

    This is of course hypothetical because there is no handholdable binocular for £15,000. And I am sure that before such a high class is reached, no more noticeable improvement is possible. We can also argue about the meaning of "perfect". Is it an image inseparable from the naked eye view or is it...
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    Steiner Hunting 10x50

    John, That is understandable. And this leads to the interesting question: how high is the price to manufacture the optical class where no further noticeable improvements are possible to reach? Yes, I understand that this also depends on the individual eye sight. A person with eye resolution...
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    Dusk light performance relative to weight, NL Pure 10x32 vs 10x42

    I want to object to that. Contrast has nothing to do with magnification in itself. And in low light, lower magnification gives brighter image and therefore better contrast. For example: in dim condition 7x50 gives better contrast than 12x50. Still 12x50 will show more details until it becomes...
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    Baby S

    I don't know whether post 94 constitutes evidence for that it's made in China or not. And I understand there is an ideological reason to dislike it if it is so. But I am looking forward to know if it meets my optical expectation. 7x28 is a very attractive configuration.
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