Extra Low Dispersion optics conundrum

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Humansvillian
Humansvillian Senior Member • Posts: 2,537
Extra Low Dispersion optics conundrum

About ten years ago, for my birthday I bought myself a 10 x 42 pair of Extra Low Dispersion Bak 4 Compact Roof Prism Waterproof Zhummel Fully Multicoated binoculars with a 25 year warranty for only $100 on sale.

I notice that Zhummel binoculars no longer wear the little ED designation.

https://zhumell.com

I can stand by my father’s Grade A milk barn at my old home at the farm with those ED binoculars and make out birds resting on the gate post to Elmer’s 60 exactly 550 yards away due West, as measured by my $100 Simmons rangefinder, another amazing modern gadget.

Gate post to Elmer’s 60

I was just sitting here wondering why, of all my gloriously beautiful M. Zuiko lenses only my oldest one, wears that ED designation that tells the customer they are getting Extra Low Dispersion optics.

Was the first M. Zuiko made with the most care?

Extra Low Dispersion optics

Makes you wonder if they use the finest Bak 4 glass and fully multicoat every element in every group on both sides?

Are those designations only for binoculars?

Or has Olympus cheapened their brand?

Any help you could give me would be much appreciated, as always.

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Humansville is a town in the Missouri Ozarks

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