The variable diopter has 2 internal lenses, epoxied into frames, that
slide back and forth as they are adjusted. One of the lenses has
probably broken off it's frame, either from impact or "age". It can be
fixed, I have new diopter assembly frames in stock.
___________________________________
John Hermanson | CPS, Inc.
21 South Ln., Huntington NY 11743
www.zuiko.com | omtech1@xxxxxxxxxxx
Olympus OM Service since 1977
On 8/15/2013 5:52 AM, Mike Bloor wrote:
> A friend has an OM4 which has an intermittent problem. When looking
> through the viewfinder, the centre of the image is in focus, but the
> rest is blurred.
>
> The camera will exhibit this behaviour for several frames, then it
> will work normally for the next few, and so on. This happens
> regardless of the lens fitted.
>
> I got him to remove and reseat the focusing screen, but that made no
> difference. A "repairer" has reported that the mirror is correctly
> positioned.
>
> Does anyone have any ideas or suggestions ? I am wondering if there
> is something loose in the viewfinder optics.
>
>
> Mike Bloor
>
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