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Who says, that you can’t mount a threaded filter on top of the Zuiko 7–14 mm f2.0 lens? With a filter diameter of 105 mm it is possible. I tested with the bare holder for vignetting. Up to now, the results are promising.

I designed and built a prototype on request. I couldn’t test the holder yet. None of the dealers in my vicinity stocks filters of that diameter. Since I wasn’t willing to spend more than 200 € for a quick test, I have to be patient. My customer will test the holder and I will report the results.

Polarizers are expected to produce strange effects when pointed at the sky. Nevertheless, they should remove reflections quite good across the whole image.

I made the BLN-1 battery cover available in my Shapeways shop. If you don’t have access to a 3D-printer you may order the cover at Shapeways. They will print the item in SLS and deliver it right to you. If the service is suitable for other projects, I will deploy them to my Shapeways shop.

I built a new buzzer for photo booths. The new case is even more stable than its predecessor. As a bonus, it allows charging two AA cells independently without opening the case. The receiver is implemented using a Yongnuo RF-603. It may be expanded with a USB-dongle that emulates a left mouse click or hitting a key on a keyboard.

 

I performed tests to power Olympus cameras (OM-D E-M1) from a 5 V source. The voltage of 7.5 to 7.6 V required by the camera was delivered by a DC-DC step-up converter.

In general, powering a camer this way is possible. I just couldn’t find a power source yet that allows to drive the camera without restrictions. Even a wall wart delivering 2 A maximum current wasn’t enough to get single frame pictures at a decent pace. Too short image intervals caused troubles saving the taken pictures. Common USB chargers won’t drive the camera even in idle mode.

Maybe a power source delivering 2.5 or 3 A may do the trick. I couldn’t verify it yet.