Nikon 200-400mm NC filter and protective glass

Started Aug 24, 2012 | Discussions thread
Guidenet Forum Pro • Posts: 15,748
Re: Protective meniscus front lens

bab99 wrote:

"Optical formula" sounds a lot like "necessary components of the complete optical design", so it would seem an important term to understand. To me it implies that without them the lens' optical sytem is not complete and won't deliver optimum image quality. Anyway, I'm not sure that question will be resolved here and I am okay with continuing to be confused about it for a while yet!


Hey Bruce, you and me both. I'm not sure I understand what they mean by "part of the optical formula." With both my two lenses, they specifically state to leave the rear clear filter installed because the lens was designed to have glass at that location whether a filter or clear.

I've never read such a thing about the front protective glass other that the part about being part of the formula. I might guess they are saying that to let us know that we won't gain anything by taking it off. Maybe they're saying that you won't lose anything removing it, but there's no optical advantage either.

Like you, I don't mind that this remains unresolved. I enjoy my lenses and they seem to produce beautifully as they came out of the box.

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Cheers, Craig

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