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

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  1. G

    Leica eye candy....

    We have investigated the 8x32 Geovid Pro and also found it to be a very good binocular/rangefinder, see our report on the WEB-site of House of Outdoor. Gijs van Ginkel
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    CZJ T3M

    To my knowledge only one prism surface of Schmidt-Pechan prisms has to be supplied with a metal mirror, since the light rays do not enter under an angle of perfect reflection on that surface leading to light losses. Abbe-König prisms do not have that problem, so no silver- or dielectric layers...
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    Vintage binos???

    sudynim, You could also look for a Swiss Kern porro, very well made and often still in good shape. Gijs van Ginkel
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    Do the owners of both Zeiss SF and Swarovski EL/NL feel they are uncomfortable for the different color cast?

    It may have escaped my attention in the discussion, but the color sensitivity of the eye can be different from person to person, but probably more important is how the color sensitivity of the human eye changes with age. Yellowing of the eye lens with increasing age is fairly common phenomenon...
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    New but probably wrong insight about lowlight

    This discussion comes back over and over . Therefore I decided to compose a large review paper entilted: "Color vision, brightness, resolution and contrast in binocular images". It is a 30 page review of published data with regard to this matter and it is published on the WEB-site of House of...
  6. G

    Habicht for birdwatching?

    Reinier, post 183, Do not try the 7x42 Habicht, it is really dangerous, since you never want to let it go after you have felt it and looked into its brilliant crystal clear images. Gijs van Ginkel
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    Usable Eye Relief (spartan method)

    Maljuno, post 7, On November 3, 2023 Groningen University celebrated the 75-th anniversary of the Nobel Prize of Prof. Zernike, which he received in 1953 for the development of phase contrast microscopy. It was celebrated by an international symposium during which also a lecture was dedicated to...
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    Usable Eye Relief (spartan method)

    Canip, post 5, I did understand from your previous posts what you are measuring and how you are measuring it, but the producers publish the eyerelief the way I described it and technically that is in my view correct. I would describe your method as practical eyerelief, since you take into...
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    Usable Eye Relief (spartan method)

    Canip post 2, For our measurements of eye relief, I use a Ramsden dynameter (designed and made by the Netherlands optical company Bleeker, the optical engineer who has worked for that company later became head of the optical workshop of the Utrecht Universities workshop and I received it from...
  10. G

    Carl Zeiss Jena DF 7x50 Extremly early model?

    As far as I can see it is a Zeiss DF 7x50 from 1915, 1160 g, FOV 128m/1000m, From 1919 called Binoctar and made until 1945. Gijs van Ginkel
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    Trinovid hype

    Ignatius, post 29, I suppose you also have Hans Seegers book from 1989 "Feldstecher. Ferngläaser im Wandel der Zeit". Very useful source of information. Gijs van Ginkel
  12. G

    Trinovid hype

    Ignatius, post 27, No it was published for the occasion of the celebration of the 100th anniversary of binocular production of Leica and the number of booklets made seems to be limited. Gijs van Ginkel
  13. G

    Trinovid hype

    Ignatius, post 25, In 2007 Gary Hawkins published a booklet "Novelties. The story of the Leica Trinovid". It gives very useful information about production numbers and production years of the different Leica Trinovid binoculars in the passed years. I do not know if it is still available, I...
  14. G

    Trinovid hype

    In addition to my previous post I report the data from our investigations of 7x35 Trinovids from different production years (the whole report can be found on the WEB-site of House of Outdoor). Trinovid 7x35B (1966) transmission values : 500nm=49%, 550 nm=57% Trinovid 7x35B (1982) transmission...
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    Trinovid hype

    Thotmosis, post 19, Your Leica Trinovid 7x35B is from around 1981 (Gary Hawkins list from 2007) and is in no way comparable with the 7x35 Retrovid from 2023 as far as transmission and image brilliance is concerned. Gijs van Ginkel
  16. G

    Best marine binoculars?

    VS007, Try the Swarovski Habicht 7x42: brilliant optical performance, magnification allright for marine use, waterproof and a joy to use. Gijs van Ginkel
  17. G

    Zeiss Victory HT 8x42 vs. Victory SF 8x42

    I would go for the 8x32 SF, an excellent binocular both with regard to user comfort and optical quality. Gijs van Ginkel
  18. G

    Baby S

    Jan I know you long enough to know that you do not tell fairy tales. So the binocular is made in China, but designed and specified by Swarovski. I am curious how good the Baby S will be, our research will show in it in a couple of weeks. Gijs van Ginkel
  19. G

    Swarovski CL Habicht limited edition.

    Thotmosis, post 18, The central focus option combined with the excellent optical and handling properties make use of the Habicht GA 8x30 a real joy. Gijs van Ginkel
  20. G

    Swarovski CL Habicht limited edition.

    Jan, post 15, You forgot to mention that you also supplied me with a Habicht CF 8x30 GA, Gijs van Ginkel
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    Help! Coatings on Victory SF being... weird?

    What happens with the color reporduction when you look at colored obects with the separe binocular tubes? I ask it since what you see are reflection colors on the objective lenses and that does not necessarily mean that your image shows a similar color shift. Gijs van Ginkel
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    Determining the date of manufacture of the Hartmann Wetzlar binoculars

    Some Hartmann data I found in my notes: Bernina 7x50 CF=1982 serial number 150028, same binocular IF serial number 157180, Bernina 10x60 serial number 152009, Bernina 25x80 149798, Bernina 30x80 monocular 1003. Gijs van Ginkel
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    Determining the date of manufacture of the Hartmann Wetzlar binoculars

    In the past century (around 1970-1985) I have visited the Hartmann company a couple of times and mr. Hartmann showed me the binocular production facility and he supplied me with quite a bit of information and some of the Hartmann binoculars. I have made an overview of the companiy history and...
  24. G

    Which monocular as a substitute for binoculars...?

    Bentley 03, post 19, After a quick measurement of the eyerelief of the Glanz 7x40 I found a value of around 12 mm. Gijs van Ginkel
  25. G

    Which monocular as a substitute for binoculars...?

    Binastro, post 13, The wide angle 7x40 Glanz porro monocular is very pleasant to use since focussing takes place by turning the objective. FOV=166m/1000m, close focus around 2 m. It is a porro and the shape of the body makes it pleasant to handle. Gijs van Ginkel
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