Alley in Pisa, Italy

by Lars Kotthoff

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286 reputation
110
bio website chuckcaplan.com
location Ellicott City, MD
age 35
visits member for 1 year, 9 months
seen Jan 14 at 21:40

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Jul
2
awarded  Curious
Nov
2
awarded  Yearling
Apr
1
accepted Why isn't my camera's internal light meter adjusting for my external flash?
Mar
29
asked Why isn't my camera's internal light meter adjusting for my external flash?
Mar
2
awarded  Nice Question
Mar
1
comment Why is my far away background in focus even with a low aperture number?
Awesome explanation as usual. Thank you.
Mar
1
accepted Why is my far away background in focus even with a low aperture number?
Mar
1
revised Why is my far away background in focus even with a low aperture number?
deleted 10 characters in body
Mar
1
asked Why is my far away background in focus even with a low aperture number?
Jan
24
asked Is Canon MP-E 65mm f/2.8 1-5X macro lens good for photos other than close-up macro shots?
Jan
10
awarded  Commentator
Jan
10
comment Why does EV increase as ISO increases?
My assumptions were wrong and the way I was calculating EV was also wrong. Details are in the comments of the accepted answer below. Not sure if this question should be closed but it was certainly informative to me. Thanks, all.
Jan
10
accepted Why does EV increase as ISO increases?
Jan
10
comment Why does EV increase as ISO increases?
Ok. I am going to accept your answer and add a comment summarizing everything. Not sure if this question should be closed because the premise was off. Thanks so much for your help!
Jan
10
comment Why does EV increase as ISO increases?
I am sure you are right... The equation I got from Wikipedia was: upload.wikimedia.org/math/a/3/3/… I guess the plus sign should be a minus sign?
Jan
10
comment Why does EV increase as ISO increases?
The update to your answer has been very helpful. I just have one more question if you don't mind. These exposures have the same EV of 14.64: F/4, 1/100s, ISO 1600 and F/8, 1/100s, ISO 400 I don't understand that. I would expect the second exposure to be darker because the aperture is allowing less light in and the ISO setting is less sensitive. I just don't get it. Thanks for your patience.
Jan
10
comment Why does EV increase as ISO increases?
Ok, for your example, when I have: F/16, 1/100s, ISO 100, I get an EV of 14.6438561897747, which is what you got. But when I make a change from F/16 to F/18, the EV changes to 14.9837061926594. F/18 allows less light in than F/16, so the image will be darker, so why does the EV increase? If I change to F/8, allowing in more light, the EV is 12.6438561897747. I don't understand why the EV would become lower as I allow in more light. Does that make sense? Thanks for your help.
Jan
10
comment Why does EV increase as ISO increases?
I am sure it is something I am not understanding, but then why does EV go down as I increase shutter speed and decrease aperture? Don't those things increase brightness?
Jan
10
asked Why does EV increase as ISO increases?
Jan
10
accepted When determining exposure, is ISO typically taken into consideration secondary to aperture and shutter speed or is it equally as important?