Rangefinder with TTL metering?

[2F/2F]

You are going to be on a tripod anyhow with today's IR films. An in-camera meter will not save you any time in that case anyhow, so it's only advantage goes away. Why rely on an inherently flawed device such as an in-camera meter when you can just get a relatively cheap hand held incident meter and get trouble-free exposures every time? What good is a little bit of convenience if you get a less-than-ideal exposure most of the time, due to the fact that most pictures do not average out to exactly middle grey?

Just to show yourself how wrong in-camera meters are most of the time, you should go out shooting one day with an incident meter. For each shot, take a frame exposed as your camera sez, and a frame exposed as the incident meter sez. When shooting, note just how rarely the two match. On these rare occasions, your composition truly averages out to middle grey within the metering pattern of the camera. When printing, note how much better the incident-exposed film prints. Especially with IR film, you are better off making an educated guess than using a TTL light meter. Just my two cents. Take it or leave it. My point is simply not to let something as trivial as an in-camera light meter make or break your decision on what camera to purchase. It's like deciding what luxury car to buy based on what type of system the manufacturer uses to gauge the fuel level.

 

[Someonenameddavid]

I have the solution: somewhere on the net is a do it yourself project which has a prototype
Somewhere on the net: a leicaphile with an old battered IIIc put a backward facing silicon photo
Diode and a simple (to him)circuit which caused an LED to glow when the correct exposure was
Found using the aperture range: he painted a white dot in the middle of the first curtain to meter off.

You could adapt a baby speed graphic to do this...
Thinking a little more laterally, if you defeated the interlocking mechanism and painted the darkslides black,
With a large white dot in the middle you could do it with a Mamiya Universal or a Graflex XL.

And you would have a lunar effect on your film protector.....
...The Darkslide of the Moon.....

Now you know the power of the Darkslide....

David