Blog

What is a Diopter?

Posted by Dwight Lindsey on Mar 31st 2020

What is a Diopter?

A Close-Up Lens is NOT a Diopter!OK, it's time for me to rant a bit about "Diopters"Close-up lenses or close-up filters are accessories mounted in front of photographic lenses and cine lenses to enabl …

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The RotaPola

Posted by Dwight Lindsey on Nov 18th 2018

The RotaPola

Polarizers need to rotate, that’s how they do their magic. High quality rotating polarizers can effectively control reflections and increase color saturation. To do that, they need to rotate.Cine …

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How Flat is Flat . . . and why should we care?

Posted by Dwight Lindsey on Apr 15th 2017

How Flat is Flat . . . and why should we care?

Our Zygo InterferometerI'm sitting today with our new-to-us Zygo Phase Shift Interferometer, which we bought recently to check and control the flatness of the filters we manufacture and sell.  …

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