Just some thoughts. A bit of a rambling post, and not likely useful to real old-timer DSLR types, but might be worth a read for the serious amateur who is looking to get better in their understanding of exposure. The meter on my $35 Canonet died, so I was looking for a light meter alternative to a cleaning, repair and adjustment (CLA I think it's called) which typically runs $100-200. Well, light meters aren't much cheaper than a CLA (and the good ones actually cost more!), but you can get an app for your cell phone (iphone in my case). The one I got, which seems the most popular based on the research I did, is simply called "Light Meter" and it's free to download, and $0.99 to turn off the ads, which I did. So, I downloaded a list of EV ranges from wikipedia: and set off with my iPhone app, and checked EV100 readings wherever I went. Truth be told, it was very educational. As a base, I learned that daytime sky (without the sun directly in view) is an EV of about 14. A typical outdoor seen is maybe 12, and good lighting indoors is about EV 7-8. I also learned that outdoor scenes (let's say, shadowy trees vs. the sky) is about a 5-7 EV spread. Well, EV 7 to 14 is 7 stops! So, that's the difference between f/1.4 and f/16 (there abouts). So, other variables have to change. Dropping from a shutter speed of 1/4000 to 1/30 is about 7 stops, and radically changes the image, and can even introduce blur if you are shooting a lens long enough without IBIS or taking pics of faster moving subjects (assuming the aperture is constant here) . I never realized an outdoor exposure could be this broad. What I've come to the conclusion is, I'm not paying enough attention to ISO, as I leave that on Auto most of the time. Floating ISO I think isolates us from getting a better, intuitive feel of light and exposure, shutter speed and aperture. I've started fixing my ISO at 200 outside (I'd prefer 100, but I'm an m43 shooter! We don't need no stinkin' ISO100!) and 400 or 800 indoors. By choosing to fix my ISO, it's making me pay better attention to the interplay of aperture and shutter speed. More specifically, about what shutter speed I could expect to achieve indoors (because I'm mostly shooting wide open aperture indoors, so aperture is fixed, practically speaking). So, now I know I can expect to be around 1/30-1/60 second indoors with my 25/1.4 at a reasonable ISO (400 or 800). I hope to get better at narrowing it down intuitively, and might even get to the point where I'll venture into "M" shooting. Why would I do this? I've no idea really other than my Canonent's meter isn't working. But I still think, long term, I'll benefit as a photographer to have a better, intuitive grasp on exposure, but I'm finding that I have to de-auto my ISO setting to have any hope to get there. Like I said, just some random, rambling thoughts. Would love to hear your thoughts on how you are learning/improving your understanding of exposure.