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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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    New "MY Junior" 7x28 aimed at kids

    I wonder about adjusting the diopter between left and right. If you have perfect vision with both eyes you don't need to do it. The same if you wear eyeglasses or contact lenses. The only situation when you need to adjust the diopter is if you wear eyeglasses but eye relief is not sufficient for...
  2. S

    New but probably wrong insight about lowlight

    I don't understand from where you get the idea that higher magnification concentrates the incoming light more. The objective gathers the light and the gathered light is proportional to the area of the objective. The magnification determines how big area the light is spread out over. If you...
  3. S

    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...
  5. S

    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...
  6. S

    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...
  7. S

    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...
  8. S

    Ocular Lens Size

    As I understand it that definition of eye box actually is the description of eye relief.
  9. S

    Ocular Lens Size

    Thanks. That is actually what I have thought about bit did not know a word for it.
  10. S

    Ocular Lens Size

    A question: I have read it before but have forgot to ask: what does "eye box" mean?
  11. S

    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.
  12. S

    NL >=50 mm versions?

    Interesting with NL 52mm models! But I don't find any information when I search about it.
  13. S

    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...
  14. 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...
  15. S

    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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