This is a mechanical limitation, when you set the film speed to over 640 you
simply cannot turn the ISO dial to DX position. I would say it is a design
limitation not a flaw.
C.H.Ling
-----Original Message-----
From: Hans van Veluwen <hcvanveluwen@xxxxxxxxx>
>: This is what is said in my OM-40 manual:
>: "Other cautions
>: The DX ISO auto-setting is not effective when the ISO speed window
>: shows a number "800" or larger.
>: First, set it at "640" or smaller then adjust for ISO auto setting."
>
>: The ISO range in the OM-40 is 25-3200, so why doesn't the DX coding work
>above ISO 640?
>
>: What do you make of it Hans?
>
>I think what's meant with the "ISO Speed Window" is the indicated value on
>the ISO dial, which is used for manual ISO setting. So what they say if you
>have used it to manually set the ISO speed at 800 or larger and want to
>revert to Auto DX setting, you should first set the manual setting to 640
or
>(s)lower, then set the dial to 'DX ISO Auto Set". Must be a design flaw.
>
>hnz
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