My review of the Canon FDn 50mm f/1.4 adapted to the Sony E-mount (NEX) mirror-less camera.

The In this article, I compare an "old" Olympus OM Zuiko 200 mm lens with a modern Canon EF-S 55-250mm IS lens set at 200mm.

An Excel-based transistor amplifier calculator.

Welcome to the paulorenato.com electronic's lab. In this article we have a look at my workspace and the many gadgets I've collected over the years.

A simple diode or the output of a transistor bias circuit can be used as a rough temperature sensor. For this purpose, a calibration procedure using a precise temperature sensor is recommended. This article shows how to calibrate such a temperature sensing circuit using an Arduino and the SHT15 Sensirion temperature/humidity sensor module.

This is a link to the article I published in the May 2012 edition of the Nuts & Volts magazine: a sound activated, laser parking system.

A quick visual "test" to see if a file is likely encrypted using the R statistical computing package.

How to make a cheap panel voltmeter from a dollar-store pedometer.

How to build your own illuminated sensor loupe for camera sensor cleaning (or other purposes).

Some of my favorite quotes about Photography.