reveny spotmeter mk2, laser and ir-cut mod

Hey everyone,

The Reveni Labs Spotmeter Mk2 is a very handy piece of tech, but it has a couple of quirks: the infrared sensitivity and parallax errors when metering subjects at a close distance. To solve both, I made a 3d printable mod. The adapter holds a 10mm (0.55mm thick, 650nm) IR-cut glass filter to fix the foliage underexposure, but it now also features a custom mount for a small laser diode.

I used a 5mW, 3V laser diode (6mm diameter, 10.5mm long). The laser is powered directly by the spotmeter's two internal AAA batteries. You simply jam the stripped cables between the batteries and the connectors, so there is no internal soldering required. The laser is then easily activated by a small button on top of the mod.

The only non-reversible change you have to make to the meter is carving a tiny notch into the battery compartment door to let the cables pass through. The main 3D-printed adapter is held in place with a drop of flexible glue (like T-7000), which keeps it secure but remains easy to remove later if you ever need to.

When you first install the mod, the laser won't be perfectly aligned. You just need to aim the meter at a distant target and manually nudge the mod until the laser lines up perfectly with the internal reticle. Because the laser is mounted about 1 cm below the sensor, the laser spot will hit about 1 cm below your metered target. But you can easily 'triangulate' your target by comparing the laser spot with the meter's reticle (check out the 3rd image for a simulation of what you actually see).

The best part is that even with this entire mod attached, the meter still fits perfectly inside its original little cloth pouch!

(I printed it in resine but it should work fine in filament)