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Determining the date of manufacture of the Hartmann Wetzlar binoculars
Thank you Gijs, your 157180 Bernina is one of the last Hartmann binoculars. I have only one found with higher serial number. -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
Thank you Jan, from the serial number i would have expected it to be produced around 1975. Do you know if guarantie card is for second hand or initial sale? -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
It seems that a part is broken out. To your question above, yes you have to collimate it again. Bring prisms to middle position and check that no image is tilted while looking through each ocular. The good thing is that you can shift the prims later via the holes of the cover plates when body... -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
Under cap you have the screw with two holes. After removing this screw you can remove the right ocular. The left ocular has a small screw which fixes the oculars bridge arm with the focus wheel below so that bridge will be leveled up when you turn focus wheel. Is this little screw broken at... -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
Hi Pondweed, welcome to this forum. 9x40 is a rare configuration for Hartmann. I have found only 15 examples in the internet from the 50's till 70's (based on serial number) all Polerims no wide angle versions. Based on the spec for the 8x40 I would guess that with same AFOV of ~56° FOV would... -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
Do you want to post a photo and the serial number of your Bernina? I would like to add it into my sample list. Thx -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
And can you see an optical quality difference between the Leichtmetall and non Leichtmetall Porlerim? Also in build quality or weight? Or did they just removed the Leichtmetall Tag from the name in the 60's? -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
I use another tongs to hold the pliers. It worked for me fine to loosen really tight screws. -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
Hello Joachim, I guess you mean loosening the screw with the two holes as in the image below. I use Needle-nose pliers (eine Spitzzange) to loosen this screw. Hartmann binoculars are very friendly for disassembling and afterwards collomating (at least contional). Stefan -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
I have never heared from the airfigther squardron, always fine to learn something new. But since the PikAs I have found have numbers from 55k to 80k they should be built mid 50s to mid 60s. So I guess no relation to WWII. -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
I have seen it but I already own two with 80k and 86k so could control my fingers and will wait for a nice Bernina or Compact (like many others too I fear 😉). Few weeks ago I acquired a PikAs Wetzlar 8x30 which seems to be also a Porlerim like your Hanseat. I have to open and clean it, then I... -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
It seems that BK7 was only used in earlier years or maybe for export market. Would be interesting what they used for example in "Simpsons" Porlerims. https://www.miniaturebinoculars.com/part6/Page3090.htm -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
Nice, one of the late Leichtmetall Porlerims. Can you tell me are the prisms made of BAK4 or BK7? At least my Leichtmetall Porlerim (37213) shows the shading of the exit pupil typical for BK7. But it was build earlier and for the english market since it has written wide angle instead of... -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
So it's time for an update because I have reached the 300 samples mark. Out of my research I have made a graph. The blue marks are hopefully exact dates. The red marks are from the introduction of new product lines. Here serial numbers fit or are below the given year. For grey marks the... -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
A Bernina for 60$ is a great find. The Hartmanns are very solid build and optical very sharp in the middle. My Porlerim (Single coated from the first half of 60s) must not hide from my fathers early 90s Swaro Habicht in points of sharpness in middle. It stays even sharper over a bigger area of... -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
Thanks for the background Info. 70s would fit. I had this already on my list since I found it in the net. 😉 It is really hard to determine the age on only few milestones. My list has now more than 180 samples. There is an huge increase in serial numbers in the 60s. Maybe the most productive... -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
A question to the Hartmann owners, my Leichtmetall Porlerim with number 37k has BK7 prisms since it shows the diamond shaped exit pupils typical for BK7. My later Porlerims and Compact have BAK4 prisms. Was BK7 typical for the Leichtmetall Porlerim production line and when did they changed to... -
Determining the date of manufacture of the Hartmann Wetzlar binoculars
Hartmann-Optik Wetzlar used a constantly increasing serial number for its binoculars. Since the number does not differ between production lines, the serial numbers for new product line introductions and thus the corresponding manufacturing dates can be identified. I searched the internet for...