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Old November 7, 2017, 04:26 PM   #4
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Join Date: September 8, 2014
Posts: 301
...which is kind of irrelevant. The ocular lens just puts the objective and focal image together for your eye. It’s size doesn’t matter as long as it creates a comfortable eye relief. There is a “right” size for the ocular lens and larger or smaller would make it worse. You rarely see any specs for them because they’ve generally gotten that part right.
It’s the objective lens that increases the scopes ability to gather light. The bigger the objective the brighter the scope in low light conditions and the less light you loose under extreme zoom.

The best way to experience this is with a large (80mm) spotting scope with a high zoom at dusk. As you zoom in you can really tell the immage gets darker as you narrow the field of view.
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