need comments on Zeiss EDF / Docter BGA 7x40 IF roof (1 Viewer)

brocknroller said:

Star Farmer,

.....Unfortunately, I'm turned off by the 6 SOA resolution. ....

Brock

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ronh said:

Note the specification of resolution, which I take to mean what we call "magnification boosted resolution", removing the acuity of the eye from the measurement. Not many binoculars guarantee resolution, and it seems odd that what this one is guaranteeing is in fact rather poor: 6 arcsec for the 7x40, 5 arcsec for the 10x42. Admittedly, this guarantee is for the worst permitted resolution, but a top notch binocular would be twice that good. So, I can believe they aren't phase coated.


Ron

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Star Farmer said:

Very understandable Brock. That's the key criteria I look for when dealing with astronomical telescopes.

Photographers pay more attention to contrast. That's what makes the highlights of their pictures stand out.

I am inclined to think that contrast has immediate appeal in binocular viewing. It gives immediacy to the overall picture, and greatly helps the acquisition of the target subject. That's probably the reason for my slight preference of the EDF over the Dialyt for general use.

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Star Farmer said:

Longer wavelengths of light are absorbed. Shorter wavelengths are scattered. That's the bluish overcast you see especially in high moisture weather. The yellow tint filters out the scattered shorter wavelength photons.

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