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  1. Well, here it is, mk.3 of my DIY night Vision (or is it mk.4, I'm losing track!). I've nicknamed it the OhmLaut 400, partly a play on my name, partly a bit of a nod to all the reading and refreshing I've had to do on Ohm's law in order to make sure everything worked as it should and nothing goes pop! And finally, a realistic indication of the useable range, summer or winter (in summer you can see a lot further with less suspended moisture in the atmosphere reflecting back the IR light). Same camera and viewer as all my other builds but I've managed to work out how to remotely run the buttons so I can have the brightness and contrast controls wherever I want them. Also, the replacement buttons are a lot more robust than the originals, so can take a bit more abuse. I've also come up with my own IR torch, which uses an aspherical lens and a simple, push/pull system to go from focus to flood. In reality the user can simply dim the IR light when switching from distant to near quarry without having to adjust the torch. The lens and torch gives a wider picture at distance, so causes less hot-spotting than the Dereelight x-searcher and can be refocused easily to blend out the lines from the emitter so there is less banding in the viewer. The torch is driven by the night vision unit itself, plugging into the front of the controls and is supplied by the same 12v supply. The unit has now done away with linear regulators and the like, so no heat to dissipate, no wasted power converting 12v into other voltages, giving maximum efficiency from the li-ion stock mounted battery. The specifications are: • 12v DC supply • Built in 12v dimming driver for the IR torch goes from 0% - 100% so there is no need to restrict the objective of the scope to prevent flaring and hot spots • Push/pull fast focus to flood IR torch driven from 12v supply • Genuine eye level viewer with focus adjustment (not a DVR with a loupe over the screen!) • 640 x 480 resolution screen • Brightness control • Contrast control • Simple on/off above eyepiece • Video out for recording I'm now working on the next version, which should condense a lot of the features and result in a shorter body (by some 25-30mm), which will give even better eye relief. Footage recorded in Summer is here. I'll be recording some more soon enough as this version now has video out.
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