Sea Eagle Binos 8x30 BAK 4 (1 Viewer)

I inherited a pair of waterproof Sea Eagle Binos. 8x30 8.3deg FOV and BAK 4 optics. Nitrogen gas filled

I won these when I renewed my insurance premium on my last boat.

I Googled these but I can find no reference to the manufacturer.

I suspect they were manufactured by a well known maker but relabelled by the supplier for marketing purposes but not sure.

The optics are fine but unfortunately the grey paintwork ( they are two tone) around the eye pieces has gone sticky. I put some parcel tape over this area to avoid the stickyness getting onto my hands. Unfortunately when I peeled this off the printed name and details describing them has been partially removed. If I use a solvent to remove the stickyness, this will make them nameless.


I have done some research and I think these are Dorr Binos. They look remarkable similar to the Dorr Danubian 8x30 Aqua Porro Prism, except mine are BAK4 optics which I believe is superior to BAK 7.
Thanks

Hi and welcome to BF, we hope you enjoy the site.
I can't shed any light on your binos but I have moved your thread to a more appropriate forum on our site where you are likely to get a better response to your question.

cheers,
Andy

“They look remarkable similar to the Dorr Danubian 8x30 Aqua Porro Prism, except mine are BAK4 optics which I believe is superior to BAK 7.”

It is a common misconception that BaK4 is a “better” glass that Bk7 (there is no “BAK7” in the Schott catalog). This is bandied about by those who are not familiar with optical engineering and the various glass types. Bk7 (a highly refined glass) is the predominant crown glassed used in photo visual instrument. Having a higher index of refraction, Bak4 is “better” in short focal ratio instruments for off-axis light throughout and most Porro prism instruments operate at around f/4—a short focal ratio. :cat:

Just a thought,

Bill

WJC said:

“They look remarkable similar to the Dorr Danubian 8x30 Aqua Porro Prism, except mine are BAK4 optics which I believe is superior to BAK 7.”

It is a common misconception that BaK4 is a “better” glass that Bk7 (there is no “BAK7” in the Schott catalog). This is bandied about by those who are not familiar with optical engineering and the various glass types. Bk7 (a highly refined glass) is the predominant crown glassed used in photo visual instrument. Having a higher index of refraction, Bak4 is “better” in short focal ratio instruments for off-axis light throughout and most Porro prism instruments operate at around f/4—a short focal ratio. 🐱

Just a thought,

Bill

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A belated Thank-you Bill. I sold these eventually but your comprehensive reply was very useful. I have a selection of binos now and understand the technical aspects better now. I bought a pair of Vortex Spitfire 7.5x32 Second hand which I am pleased with.