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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 22 Mar 2011 (Tuesday) 00:53
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Why would AE exposure vary this much?

Senior Member
737 posts
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Location: Asheville NC
Mar 24, 2011 00:18 |  #16

FlyingPhotog, I've been playing around with your info and I have a few observations.

FlyingPhotog wrote in post #12067704 (external link)
Now, obviously you probably don't want to be schlepping around with depth of field that will cover from your nose to Kansas, so all you have to do is work the reciprocal exposures down to the aperture you want:

1/125 @ f/16
1/250 @ f/13
1/500 @ f/11
1/1000 @ f/8
1/2000 @ f/5.6
1/4000 @ f/4
1/8000 @ f/2.8

You didn't really mean to put f/13 in there, did you?

In mechanical terms, for every one click of shutter speed in one direction, click your f/stop once in the opposite direction.

Now THIS is good info. Very handy!

I find the tricky part to be deciding what's "full direct sun." I thought that's what I was out in today and found I was having to give anywhere from 1-2 stops more exposure than the "sunny 16 rule" would indicate. I finally realized that my perception of "full direct sun" was colored by not having actually seen full direct sun for a while! (Come on, Spring!) When I actually paid attention, I realized that, while it was sunny with distinct shadows, it was far from full sun. Then I checked the time; it was about 3:30, not between 10-2. So much to keep in mind. But I think still better than P mode.

Anyway, thanks again for the info.

Cream of the "Prop"
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Mar 24, 2011 00:22 |  #17

You're right, f/13 only falls in half-stop increments.

My Bad

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Mar 24, 2011 01:21 |  #18

ncjohn wrote in post #12067458 (external link)
As I explained in another thread, I was taking some shots in a situation where just getting the shots was more important than making them great, so I was using Program AE mode. I don't have a lot of experience using P mode and I'm really puzzled about some of the things it did. These 2 pictures are the perfect example. Taken 4 seconds apart, so the lighting's virtually the same, framing is almost the same, but the exposure is really different. Can anyone explain to me why that is?
These are straight "convert and save" from RAW in DPP with no PP of any kind.

Virtually or exactly? Almost or exactly?

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Why would AE exposure vary this much?
FORUMS Photography Talk by Genre General Photography Talk 
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