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A larger lens produces a brighter image than a smaller lens with the same
focal length does.
Another contributor added:
A larger lens also gathers more light than a smaller lens does, enabling the viewer
to see dimmer objects that they would be able to see with a smaller diameter lens,
or the naked eye. The human eye reveals the light of stars down to 5th magnitude.
A 2 1/2" lens reveals the light of stars down to 8th magnitude, and so on.
To which the first contributor noted:
It does all of that by producing a brighter image than a smaller lens
with the same focal length does.
Wiki User
∙ 13y ago
Wiki User
∙ 15y agoBetter in the sense that you have a larger image and see an object farther away than a smaller lens. A bigger lens is not necessarily better -- it is more expansive, harder to polish, harder to maintain or mount. Need to be more careful with any temperature gradient across the lens. You choose a lens that is good enough to do the job, but not necessarily choosing the best.
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