Thread: 120 deg FOV? Is there a name for widefield eyepiece addiction?
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Old 26-04-2009, 11:33 AM
Wavytone
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there is...
... the Koehler eyepiece is a 120 degree FoV design, with 11 elements, it's not the only one; there are other military designs.

The larger the FoV the more elements and surfaces internally, ie light loss and scattering will be high
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