Testing Dive-Computers

Testing equipment in mountain lakes.

I got a brand new dive computer a couple of days ago. It needs a certain number of operating hours in order to get the approval for public usage. I am therefore out and diving a lot. This may cause delays in answering requests. Please be patient.

The picture shows computers I got for testing a while ago. The current test devices are still top secret!

Threaded filter holder for the Zuiko 7–14mm f2.0 lens

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.

Threaded filter holder for the Zuiko 7-14mm f2,8 lens

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.

New Heavy-duty Buzzer

Heavy-duty buzzer with charging adapter and USB-receiver
Heavy-duty buzzer with charging adapter and USB-receiver

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.

 

Power Olympus Cameras from a 5 V Source

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.

BLH-1 Battery Dummy available!

BLH-1, BLN-1 and BLS-5 Battery-Dummy

After a series of tests I have built a BLH-1 battery dummy for Olympus cameras (currently the OM-D E-M1 Mark II). Since the battery is larger than other models, the lid of the battery compartment is also bigger. This allows to cut a slot for the cable to pass through while the lid is closed. You shouldn’t do this to the original lid. That’s why I currently try to get spare battery compartment lids for the camera.

You may find more details about battery dummies on my Battery Dummy Page.

BLH-1 battery dummy coming soon!

BLH-1 Adapter

I got already requests for BLH-1 battery dummies (for the Olympus OM-D E-M1 mark II). Therefore, I made first measurements and built a prototype. During the next few days, I will test and refine the prototype.

If the test results are promising, I will have PCBs built and launch a first series.

More about the new battery dummy in a few days.