The non-linearity is small and when calibrated to read correctly at 16EV
the errors in the rest of the range are limited to about 1/3 stop. Tim
also has some more sophisticated "no compromises" designs.
Chuck Norcutt
Fernando Gonzalez Gentile wrote:
> Good morning everyone,
>
> Found a .pdf from Tim Hughes which says: "How To Convert an OM-1/1N to use a
> Silver Oxide 357 Cell (Germanium Series Diode Method)"
> At the beginning, he says: "Accuracy at high EV values will be lower and
> there will be some small meter non-linearity. (aprox 0.4 EV, and some small
> temperature sensitivity) This modification is essentially the same as using
> a (Criscam) MR9 adapter, but building it into the camera." ...."The 1N34A
> should be a very easy part to get as it..." etc.
>
> File should be found at:
> <http://olympus.dementia.org/Hardware/PDFs/OM1DiodeVer2_1C.pdf>
>
> I'm surprised since I thought the MR9 would give no meter non-linearity.
>
> As you see I'm about to buy an OM-1n (which should be water resistant :-)
> but want to be sure about batteries. I know this must have been discussed
> hundreds of times but hadn't paid enough attention since I was born OM-2....
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