opticalglass

The first post I made on sensor-stack thickness wallowed deeply in PhotoGeekery. This one is meant to be of practical use so I’ll try to leave the Geek stuff out. We’ll start with the simple facts.

NOTE: This is a Geek Post. If you aren’t into geeky photo measurements, or into adapting lenses from one brand of camera to another, you’ll not be interested.

A year or two ago, I wrote a blog post where I basically showed lenses shot on adapters on other cameras aren’t acceptable for testing. If you run them through Imatest the results aren’t accurate. I suggested that reviewers shouldn’t test lenses on adapters, although obviously adapters are a great way to use interesting lenses to take pictures.

At CES 2013 earlier this year, Hoya showed off a new series of lens filters called the HD2. The main feature of the filter set is its strength: each filter uses hardened glass that can take a serious beating without getting damaged or shattering.

Nikon recently put out this short 3-minute video that offers an interesting glimpse into one of the critical steps of lens making: the production of the optical glass. It steps through the various stages of manufacturing, from combining the raw elements through examining the chunks of glass before they're polished and perfected.