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Old Trinovid and Foton 10x40s

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Old Yesterday, 09:43   #26
Gijs van Ginkel
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Binastro, post 21 and other posts,
In my report (in English) about the Leica Retrovid 7x35B, yesterday published on the WEB-site of House of Outdoor, I have also investigated the Foton 7x35 (plus the fairly unknown Beck Diorit 8x30) and the new Kowa 6,5x32.
So if interested you can compare the performance of the Foton with the other binoculars.
Gijs van Ginkel
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Old Yesterday, 14:02   #27
Binastro
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Hi Gijs,

Sometimes my old computer doesn't seem to get onto your reports.
So would you please tell me what the transmission is for the 7x35 Foton?

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B.
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Old Yesterday, 16:22   #28
Gijs van Ginkel
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Binastro, post 27,
We found for the Foton 7x35:
500nm = 68,5%
550 nm = 69%
From 550 nm the spectrum levels of reaching roughly 60% at 700 nm.
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Gijs
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Old Yesterday, 16:51   #29
Binastro
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Thank you very much Gijs.

I will try to read the report if able.

So basically Foton 70% Retrovid 90%.

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B.
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Old Yesterday, 18:02   #30
Gijs van Ginkel
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Binastro, post 29,
That is correct allthough the Retrovid climbs from 500-550 from 90% to 92%.
Surprise for me of this test was the Kowa 6,5x32 with a transmission of 90% constant over practically the whole spectrum.
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Gijs van Ginkel
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Old Yesterday, 22:04   #31
Gijs van Ginkel
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To all readers,
Joachim just drew my attention to an error in my test report about the Leica Retrovid in which also the Kowa 6,5x32 was investigated. In table two I wrote that this binocular does not have phase coating, but that was wrong, so you can change it yourself, but I will also see into it that it is changed. Apologies for the confusion.
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Old Yesterday, 23:13   #32
Binastro
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Also there is the 5x25 Foton.
12.2 degree field from memory.
The one I have is very good. The objectives are actually 30mm aperture but stopped down somewhere inside giving a 5.0mm exit pupil.
This maybe gives a longer focal length than usual 25mm binocular objectives.

The 8x40 original Trinovid is not I think 80m at 1000m field size.

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B.
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