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Whats The Meaning Of F , N , Or S Coat ? (1 Viewer)

gcole

Well-known member
United States
I am confused ?. When looking at some of Opticrons past, now discontinued binoculars. Such as the Imagic BGA SE 8x32 having " F " type multi - coatings or the Classic BGA 7x36 having " N " type coatings and the DBA Oasis binoculars having " S " type multi - coatings . So what's the difference ? Is one coating better/ brighter than the other ? I am curious because I had the 8x32 Countryman HD 8x32 and it stated having the Oasis prism coatings with no letter labeling.
 
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The use of N, F etc is usually a reflection of the name or type of coating material being used but there is not particularly a classification of good, better, best etc. except that we will use the best coatings currently available for the price point of a particular product at the time we determine it's specification.

For the examples you've given, the N type on the Classic would be of lower performance than the F type on the BGA SE as the latter was put on the market later and at a higher price point.

In the case of the Oasis S-coat designation, the Oasis refers to the prism coating and S to the fully multi-coated optical components' coating. In this case, S type is superior to N and F due to the higher price point and performance of the DBA versus the BGA SE and Classic.

There ya go - clear as mud :)

Cheers, Pete
 
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