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Light Trasmission

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/25/2007 at 14:35
1stscope View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: January/14/2007
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Sorry if this has been posted before....

 

http://www.birdforum.net/showthread.php?t=63770

 

light transmission efficiency vs brightness

 

A friend recently looked at some of the data developed to evaluate binoculars for US Gov't use. Allot of the data refers to immersibility, shock resistance etc. But of particular interest to me was the "light transmission efficiency" rating as a % of total wideband light projected through an aperture 2.5mm x 2.5mm. The ratings for the best binoculars were the Fujinon FMTR-SX and Nikon Prostar (I didn't have a Nikon model # so I don't know if this is the current ED version or previous model) at 97.4% and 97.5%. Then came many, many other binocular models like the Fujinon M-22 (96.2%). I guess the Sandia, Lawrence Livermore, Los Alamos, JPL mandate was to test just about every binocular they could find. But the highest rated roof prism model was the Swarovski SL 10x50 at 93.3%, with the Zeiss FL 10x56 T* right behind at 93.2%.

 

Sadly even the Steiner 7x50 Marine and Tasco Waterproof 322BW had better light transmission than the Swarovski and Zeiss (96.4% and 95%). There were many other Swaro and Zeiss models tested at magnifications ranging between 7x and 15x and none did as well as their 2 best rated models except the Zeiss 7x50 Marine BG*T at 96.6%. The Leica Ultravid 8x50BR was the best performing Leica at only 91.5% light transmission.....

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/25/2007 at 16:42
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Optics GrassHopper
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Seems to me that this proves if you try hard enough you can come up with some narrow test that proves the opposite of the practical truth. If someone thinks the Fujinon or Nikon bino's are better than Leica/Zeiss/Swaro let them fool themselves. What some offbeat test proves means far less to me than what my own eyes tell me...................DJ
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/25/2007 at 17:02
www.technika.nu View Drop Down
Optics Journeyman
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Interesteing that it doesent shows any actual charts and results.

And that is not very surprising as it's just another post at a forum.

 

I doubth the reported results, as I have seen a number of similar tests.

9 times out of 10 does Zeiss win them.

So this sounds strange.

 

 

 

Regards Technika

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/26/2007 at 08:23
jonbravado View Drop Down
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actully in fujinon's defense -

 

my 7x50 fujinons outperform my buddy's Swaro 7x50's - we both agreed.

 

i paid under 600 for mine - he paid 1300 or better for his.

 

NOT knocking swaro, but fujinon's are for real. i have owned zeiss, nikon, kahles, and a few others. 

The fujinon's are ridiculously bright.  Without losing resolution.

 

J

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/02/2007 at 23:22
1stscope View Drop Down
Optics GrassHopper
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"If someone thinks the Fujinon or Nikon bino's are better than Leica/Zeiss/Swaro let them fool themselves."

 

Actually, it's kind of common knowledge in astronomy circles that Nikon and Fujinon are better than Leica/Zeiss/Swarovski, at least when comparing the Nikon Prostar and Fujinon Polaris. It's also common knowledge that everything else being equal porro prism models are brighter than roof prisms. Even current Zeiss ads claim 'over 90%' transmission for the Victory models, sometimes stating 93%, while Fujinon has been advertising over 95% across the visual spectrum for awhile, a figure that Nikon also seems to achieve.

 

The study mentioned seems to support the Zeiss claim of 93%, although it's not clear if it's peak or over what part of the spectrum. If you claim that the study is wrong then the Zeiss values are evidently wrong too, as it supports them, but if you agree in order to support the Zeiss values then you also need to acknowledge the higher transmission of the Nikon and Fujinons. Still, it'd be nice to see the values over the spectrum.  

 

The usual observation is that the Nikon has better images farther out on the edges than the Fujinon, some find the Nikon slightly sharper than Fujinons in the center, some don't, and otherwise the Fujinons are sometimes about the half the price of the Nikons. The comparisons below don't include the Prostars.

 

http://www.holgermerlitz.de/nikon8x32.html

 

http://www.holgermerlitz.de/fujinon10x50.html

 

http://www.holgermerlitz.de/miyauchi7x50.html

 

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