How small can a UV-B plus UV-A sensor be made?

Rather recently Vishay announced a miniature sensor under the name VEML6075 with two channels centred at . It is not just a sensor but it has all the electronics for temperature compensation and for converting the analogue signal from the sensor into digital data with a rough calibration applied. The package of this sensor is 1 mm thick and 2 mm times 1.25 mm in area. The sensor itself is much smaller and it follows reasonably well the cosine law without any diffuser. Price? Less than 2€… and between 4 and 7 € for a breakout board.

I haven’t tested it yet as a sensor. However, today I was testing a macro lens and I took a pair of photographs at rather high magnification, and as it fits a UV sensor, I photographed it both in visible and in UV-A radiation.

The whole image is 3 mm tall by 4 mm wide. It is slightly cropped from the full frame. Light source Convoy 2+ 365nm UV-A flashlight filtered with a visible blocking filter. Filter on objective zwb1 2mm thick, objective Zuiko 38mm f:3.5 macro (Olympus OM-System ca. 1973-1975+, single coated early version).

Zuiko Macro 38 mm f:3.5, RMS mount, Olympus OM-System ca. 1972-1976.

More on taking photographs through windows

The “Ultimate Lens Hood” seems like a good tool. It is still to be seen if it is stiff enough and/or a bit sticky so as to easily stay in place on the glass surface. It has the potential for being very useful but how easy it will be to handle with different lenses is still to be seen.

I just made my pledge for one ULH at Kickstarter. If you want to get your own, be aware that the campaign is about to end.

An oversized conical bellows of black silicone: the “Ultimate Lens Hood” (ULH).

See my earlier post to learn how I have been managing until now with normal collapsible lens hoods made of rubber. I recently uploaded a gallery of photos from an ongoing project where I am taking photographs through train windows.