Optimizing Ground Glass focusing screens

Seems like I am always trying to improve my focusing options, not just on my Rolleiflex, but also on all my older cameras and particularly on my LF cameras. There are a lot of factors to consider from the type of glass to the grit and process used, acid treatment, optical coatings, and then of course fresnels are almost their own subject.  Lens fit to the camera can also affect the type of screen and fresnel you might want. IRead more

8×10 film vs IQ4 150mp | On Landscape

8 years ago I was fascinated by Tim Parkin’s article comparing film to the then best digital medium format backs – and one of the reasons I began to explore film in a more serious way.  I’m excited to see that he’s recently updated this with a new comparison of 8×10 film to the 150mp digital backs.  For me this is a re-confirmation of what I’ve already found myself while shooting 6×6 mf, 4×5 and 8×10 LF film.  Besides theRead more

Free eBook – Century of Optics

The Optical Society website has a number of books and pamphlets on a number of topics related to optics or imaging that might be of interest.  This Century of Optics book (free download) briefly covers topics from early camera and lens design to the development of things like bar code scanners.  Follow the top menu link to their bookshelf to see other books. OSA is the leading society in optics and photonics. Quality information and inspiring interactions through publications, meetings,Read more

Facial recognition technology – a threat to privacy? “Opinion | We Built a (Legal) Facial Recognition Machine for $60”

From the New York Times article by Sahil Chinoy on April 16th 2019 What we found shows the technology’s promise — and perils. Source: Opinion | We Built a (Legal) Facial Recognition Machine for $60 Facial recognition technology – a threat to privacy? The NY Times article details how easy it is to use existing public web cameras that live stream and services like Amazon’s or Microsoft’s facial recognition services to identify and track people.   It’s a bit chilling actuallyRead more

Kodak’s Downfall Wasn’t About Technology

Harvard Business Review article on Kodak The first digital camera was invented at Kodak.  Kodak invested big money into commercial digital cameras early on, and they even bought some on-line photo sharing businesses.  So why if they had invested significantly into technology, why did they still fail to jump the gap when it came?   This article goes into a lot of detail but clearly a lot of big companies failed to see that the internet could reach directly toRead more