Gobe filters: what is Peak and Urth filter grades?

2 years 1 month ago #705638 by Fitch
I was looking at getting some new filters and these guys have listed on left side under filter grade "Peak 1, Peak 2, Peak 3 and Urth".

What are these?


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2 years 1 month ago #706263 by CatherineW
From their site:

"Mainly it’s the quality of the optical glass and the number of nano-coating layers.Urth has two different ranges of filters: Urth (our premium range) and Urth Plus+ (our professional range). Our Urth range uses premium Japanese AGC optical glass and features an 8-layer nano-coating. Our Urth Plus+ range uses the world’s best optical glass – German SCHOTT optical glass and features a 20-layer nano-coating (our UV Plus+ has 30 layers).If you’ve invested in a professional-quality lens, we recommend you match its quality with our Plus+ range. Our Urth range is the perfect option for all other standards of lens."

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