Symbol in viewfinder

[edstock]

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I just within he past week pulled out my M 7 and put in new batteries. All of my equipment, both M and R have been unused since around 2010. I have been making myself familiar with the systems. My question concerns a symbol in the viewfinder on the M 7. I know what the arrows are, the red dot, the flash. What I don't recognize is a constant flashing little squiggle to the left or directly under the arrow(s). It is not the flash indicator. Any ideas or help appreciated.

[pico]

The indicator might be indicating that your scene is considered beyond the meter's low range. Try it outside in daylight.

 

Edited December 15, 2018 by pico

[wattsy]

It just means the ISO is set to something other than the speed of the film (as specified by the DX coding).

[edstock]

You called it. Film speed vs DSN. I always prefer setting my own ISO/ASA number. That's the one thing that I could find no mention of in the manual. Not viewfinder symbols or film speed. Thanks.