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Optics are a series of compromises (lets say five factors), juggle the variables to achieve the outcome you need.
Optimise one or two optical factors and the price is low.
Optimise three or four of the factors and price is medium.
Optimise all five of the optical factors and price blows out.
That is a simplistic but pretty accurate way to understand the broad price range you see in most types of lenses including eyepieces.
TV have optimised many factors and the price reflects that.
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