Adapting Industrial Lenses For Macro Photography

If you ever visited some industrial surplus shops, very often you would see some cameras and lenses used in industrial automation. But you probably do not know that these lenses can have very high optical performance and features we want: high resolving power, large image circle, low distortion, and often very long working distance compared to some of other lenses we use.

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Playing With DigiSpark

I was thinking about building a delay circuit quickly and effectively and with small footprint. The idea is to delay a signal either from a camera or from other camera triggering devices and then trigger a flash after the delay.

Beside my need to build such a circuit, it is also my goal to share it and make it DIYable. Therefore, using a small microchip came up to my mind. One such MCU is Attiny45 series by Atmel (now Microchip) as it is so popular and you can use an Arduino to program it. While searching for Attiny45, I came across something that I have forgotten — DigiSpark boards!  Continue reading Playing With DigiSpark

Getting Clean Black Background

Very often I encounter a beautiful image with black background but with a slight set back — the background is not as “black” as the author (and I) intended to be. And again often, you can see lots of photoshop efforts to make it black, such as spotty blobs of different shades of black, traces of black brushes, etc, but these efforts fail too frequently to wonder how to get a good clean black background!

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Using C-mount Lenses On Micro Four Thirds and Super 16 Cameras. Part II

In last blog, I covered general thoughts about using C-mount lenses on MFT or super 16 cameras, I think it is time to do some testings on these cheap C-mount lenses.

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APS-C coverage C-mount lenses are getting more popular than ever, here are two first generation ones, a 35mm and a 25mm.

Continue reading Using C-mount Lenses On Micro Four Thirds and Super 16 Cameras. Part II

Using C-mount Lenses On Micro Four Thirds and Super 16 Cameras. Part I

Ever since I bought the Panasonic GH5, I was shocked by the fact that lenses for Micro Four Thirds (MFT) cameras are so expensive. Though, I am able to salvage my Canon lenses by using an adapter with and without speed boost glasses, I am still in search for some other options. Needless to say, I happened upon some C-mount lenses and I am amazed, to say the least, by the performance of some of these lenses.

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There are thousands of C-mount lenses out there with various focal length, sensor coverage, and above all, quality, but not all of them can be used on MFT cameras, so how do we choose?

Continue reading Using C-mount Lenses On Micro Four Thirds and Super 16 Cameras. Part I

Reading Digital Caliper From Arduino

I have just encountered the need to read a digital dial indicator for another personal project. However, most of these digital dial indicators are “expensive” (normally cost about 30 – 100 USD), so I figure to just get a cheap digital caliper costing about 3 USD to start with. I totally understand that a cheap digital caliper might have different data protocols, but from what I gathered on the internet, most of these Chinese digital measurement tools use similar format — a clock and a data.

CaliperProofArduino output matches (closely) caliper reading. There are some discrepancy, but I think it the poor caliper that is displaying wrong data

Not able to find my USB logic analyzer and my oscilloscope is dead, I decided to use an Arduino as signal analyzer. read more