Robert Moore
Well-known member
B&H says that the NL has fluorite containing HD lenses. On the EL it just says Flouride glass. Just wondering if it’s real fluorite like the Takahashi telescopes.
Mmmmmmm....calcium.
My Zeiss SF looks like it has a true Flourite element in the rear objective glass. Front glass has a dot with line and another dot and than no line and just a dot.
Thanks for the confirmation, Robert.
For small, low magnification binoculars I don't think there is much reason for anybody to use Fluorite or an equivalent glass type with an Abbe # of 95. Of course, that won't prevent the use of loose marketing terms that imply the use of Fluorite.
Henry
Just the big 82mm Kowa uses pure Fluorite. I don't know of any regular sized birding binocular that uses pure Fluorite lenses.Kowa claim on their genesis binoculars to use pure fluorite
Just the big 82mm Kowa uses Fluorite. I don't know of any regular sized birding binocular that uses all Fluorite lenses.
https://sportingoptics.kowa-usa.com...-high-lander-32x82mm-fluorite-binoculars.html
The subtle distinction between (calcium) fluoriTe and fluoriDe (glass)...
Thanks for the confirmation, Robert.
For small, low magnification binoculars I don't think there is much reason for anybody to use Fluorite or an equivalent glass type with an Abbe # of 95. Of course, that won't prevent the use of loose marketing terms that imply the use of Fluorite.
Henry
Just the big 82mm Kowa uses pure Fluorite. I don't know of any regular sized birding binocular that uses pure Fluorite lenses.
https://sportingoptics.kowa-usa.com...-high-lander-32x82mm-fluorite-binoculars.html
Do any binoculars contain true Fluorite Henry ?Hi Robert,
I think I do see a barely visible wisp of a trail in the back element of the cemented doublet. You would expect a very dim trail through the "FL" glass and in this photo it's further obscured by the bright interior background. The front element has such a bright trail because it's a high dispersion "flint" glass.
In the photo below of the NL's air spaced triplet I tried to keep any bright light except the laser out of the binocular, so the dim trail through the front singlet and the "ED" element of the rear cemented doublet can be clearly seen. In this case the "flint" with the bright trail is the last element.
If they had gone to the expense of using genuine Fluorite I don't think Zeiss would have been shy about letting us know.
Henry