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08-16-2012, 08:29 AM   #1
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EV St0ps - 1/2 or 1/3 and why?

Do you set your K-5 EV stops at 1/2 or 1/3 and do you match your ISO? Taking flash timing issues out of the discussion, which EV stops do you set and why?

08-16-2012, 08:35 AM   #2
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I set my K10D's EV steps to 1/3 for more flexibility in correctly exposing an image, especially when I want to use a wider aperture in the late evening as the sun is setting and I'm losing light.

As far as flash timing goes you lose 1/180 with 1/3 EV steps in M and Av modes, but there's not much difference between 1/180 and 1/160. If I really need 1/180 I set the dial to "X" and keep 1/3 EV steps.
08-16-2012, 08:36 AM   #3
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I use 1/2 stops. If I cannot get it close enough with a 1/2 stop 1/3 stop is not going to help. When shooting RAW there is more than enough flexibility to adjust the exposure a bit if I did miss.

I think 1/3 is too complicated, I have enough trouble remembering the 1/2 stops........
08-16-2012, 08:42 AM   #4
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This topic was discussed some over in this thread: https://www.pentaxforums.com/forums/pentax-beginners-corner-q/191915-1-2-1-3-exposure-value.html

Mostly, I keep my EV stops for shutter and aperture at 1/2 because it seems easier to me. Lately, I've been trying out having the ISO in whole stops. I'm not sure yet if I prefer this set up or not. I might return to having everything set at 1/2 stops. I'm just not picky enough with my exposure fiddling to need 1/3 stops except for possibly in very rare circumstances. I'd like to observe a little more closely how the choice between the two affects the semi-auto exposure modes. Maybe that would fit into someone's equation for making their decision.

QuoteOriginally posted by CMG Quote
Taking flash timing issues out of the discussion, which EV stops do you set and why?
Well, falling on the max flash sync of 1/180 does fit into my equation for why I like using the 1/2 stops.

08-16-2012, 08:55 AM   #5
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I am a 1/3 kind of guy. I just like the extra fine tuning as I shoot jpeg and do no post photo, unless it is for a client or "gallery worthy photo"
08-16-2012, 09:00 AM   #6
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1/3th for me as well, simply reason is that im used to that. these days there is more hen enough leeway to use 1/2th so in a way that is faster.
08-16-2012, 09:04 AM   #7
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QuoteOriginally posted by calculator01 Quote
I am a 1/3 kind of guy. I just like the extra fine tuning as I shoot jpeg and do no post photo, unless it is for a client or "gallery worthy photo"
I shoot JPEG as well so I appreciate your perspective on this issue. I try to get my exposures correct and do minimal PP. I guess the related question is how much finer is the fine tuning when you go from 1/2 stops to 1/3 stops. Is it "real" or is it a "bell and whistle" feature to market the camera? Or was it developed really for use in auto-modes? I mean, as I understand it, in the old film days it was all 1/2 stops.
08-16-2012, 09:32 AM   #8
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Hi CMG,

I shoot jpegs and use EV comp probably more than most since I shoot birds in very varied settings as they appear, I often need to adjust EV comp from shot to shot. Though 1/2 stop is quicker, I have settled on 1/3 stop as it is a bit more precise, and I get overall better results for my jpegs with the greater precision.

Each to his own though -- that's why there's a choice. If I shot RAW more, I'd probably fo to 1/2 stops to make it easier since I'd have more DR to work with.

Scott

08-16-2012, 09:41 AM   #9
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1/3 e.v. (stop) gives you more control, 1/2 is faster--gives you greater range (on K20D anyway).

If coming from film--film iso was rated every 1/3 e.v. (e.g., iso 100, 125, 160, 200) while lens aperture was often 1/2 stops, or could be estimated at 1/2 stop--by placing ring midway.

If you don't use it much--need to ask--I suggest 1/2 e.v. is a good start.
08-16-2012, 09:43 AM   #10
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Until they have 1/4 EV stops I won't be satisfied! Actually, I'd probably be more comfortable with that than 1/3 as I could still hit 1/2 stops, despite the loss in speed it would create for scrolling through the values. My guess is that while 1/4 stops wouldn't present any problem for the shutter speed or ISO, it could be difficult to have the aperture hit that value accurately.
08-16-2012, 09:51 AM   #11
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thanks for the post, something else to think about.
08-16-2012, 10:04 AM   #12
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QuoteOriginally posted by dms Quote
1/3 e.v. (stop) gives you more control, 1/2 is faster--gives you greater range (on K20D anyway).

If coming from film--film iso was rated every 1/3 e.v. (e.g., iso 100, 125, 160, 200) while lens aperture was often 1/2 stops, or could be estimated at 1/2 stop--by placing ring midway.

If you don't use it much--need to ask--I suggest 1/2 e.v. is a good start.
Can you explain a bit more for me how 1/2 gives you greater range? I see how it is faster because there are less steps to a full stop, but I'm not sure about the greater range part. Thanks!
08-16-2012, 10:07 AM   #13
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QuoteOriginally posted by TomTextura Quote
Until they have 1/4 EV stops I won't be satisfied! Actually, I'd probably be more comfortable with that than 1/3 as I could still hit 1/2 stops, despite the loss in speed it would create for scrolling through the values. My guess is that while 1/4 stops wouldn't present any problem for the shutter speed or ISO, it could be difficult to have the aperture hit that value accurately.
This is an interesting point....can you explain a bit more? It's funny, but until I read your post, I had not realized the fact that in 1/3 steps you can't hit a 1/2 stop. I suppose, I'm wondering about the significance of that and how it impacts exposure vs 1/3 steps. I understand that a full stop is a full stop, it's a question of whether you get there in 2 steps or 3...but is there more to the story?
08-16-2012, 10:23 AM   #14
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greater range of adjustment on (K20D). +/- 6 e.v. stops --> +/- 3 stop vs +/- 2 stops for 1/2 and 1/3 e.x. steps respectively
08-16-2012, 10:25 AM   #15
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QuoteOriginally posted by dms Quote
greater range of adjustment on (K20D). +/- 6 e.v. stops --> +/- 3 stop vs +/- 2 stops for 1/2 and 1/3 e.x. steps respectively
..Huh?
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