I have found some non-linearity at BV9 & 6 with older OM-1 (usually less
than 1/4 stop and that may be due to aging cds cells). Meter is calibrated
at BV12, then (again if cells are good) BV15 drops right in.
John Hermanson
Camtech Photo Services, Inc.
21 South Lane, Huntington, NY 11743
omtech@xxxxxxxxx | www.zuiko.com
Factory Trained OM Service since 1977
__________________________________
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Monday, June 27, 2005 12:16 PM
Subject: [OM] Re: MR9 and meter non-linearity
> 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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