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I understand it to mean like 1/3 of a second, no? Which sounds right to me

shows like this: Screen Shot 2018-02-09 at 2.10.41 PM.png

Does that show up as 1/3 anywhere else?

that's the only way I know to look up the photo info. But for me 0.3 second is one third of a whole second, not sure what 3/10 would mean? (what does the 10 stand for?)

I recognize that some cameras don't have the normal f/stop system. Such as phones and other cameras that don't even have shutters.

I did some more and 1/3 seems like it would be .3333333 seconds. haha

Haha, yes, for sure. I shoot with Canon 70D. I don't do much manual exposure yet, but I often look at the photo info to learn about the settings. But I am not sure why some info is given in fractions and some in actual seconds. I'll have to figure that out.