Is their an idea exposure value in sports photo...

[ItzBitzHair]

I am looking at my photo and the ones with good color and exposure have an exposure value of around 8. I wanted to know if there is an idea value for photos. Basically Sports and Studio.. please advise....

[Jim G]

By exposure value do you mean aperture?

[ItzBitzHair]

i found this but it does not give tell where iso fits in..

a p e r t u r e v a l u e
1.0 1.4 2.0 2.8 4.0 5.6 8.0 11 16 22 32 45 64
s 1 0 1 2 3 4 5 6 7 8 9 10 11 12
h 2 1 2 3 4 5 6 7 8 9 10 11 12 13
u 4 2 3 4 5 6 7 8 9 10 11 12 13 14
t 8 3 4 5 6 7 8 9 10 11 12 13 14 15
t 15 4 5 6 7 8 9 10 11 12 13 14 15 16
e 30 5 6 7 8 9 10 11 12 13 14 15 16 17
r 60 6 7 8 9 10 11 12 13 14 15 16 17 18
125 7 8 9 10 11 12 13 14 15 16 17 18 19
s 250 8 9 10 11 12 13 14 15 16 17 18 19 20
p 500 9 10 11 12 13 14 15 16 17 18 19 20 21
e 1000 10 11 12 13 14 15 16 17 18 19 20 21 22
e 2000 11 12 13 14 15 16 17 18 19 20 21 22 23
d 4000 12 13 14 15 16 17 18 19 20 21 22 23 24

[ItzBitzHair]

I mean the ev.. the value you get when you combine the apeture, SSpeed and iso...

is there and idea value you should try to achieve in your photos...

... I would imagine this is what you are trying to measure when you use the meter huh.. I have never used a meter

[ItzBitzHair]

i fund this to help at least

http://www.robert-barrett.com/photo/exposure_calculator.html

[dmwierz]

Hair - not sure what you're asking. As I use them, EV's are just ways of equating exposure conditions by changing parts of the exposure triangle:

http://www.pbase.com/dmwierz45/image/92707031.jpg

As in ISO800 f/4.0 and 1/500s has the same EV as ISO200 f/2.8 and 1/250s.

I don't know of an "ideal" value. The classic EV formula is a base-2 log of the ratio of the aperture squared divided by the shutter speed. Notice ISO isn't mentioned as it is consider to be a constant, which in reality, it rarely is (might be a holdover from the film days when ISO was sort of a constant - now that we have digital cameras that can change the ISO with the turning of a dial, the concept of EV is of less value).

When I have seen numbers given to EV, they have been at a fixed ISO, like 100. This isn't much use to a sports shooter, as you rarely shoot at ISO100.

So, in order to have meaning, you'd have to say "An EV of 12 at ISO400" or something like this, not just "What EV should I shoot at?".

But let's not worry about something as esoteric as "EV". Generally, in sports photography, you want to keep your lens almost wide open to isolate the subject and blur the background (usually f/4.0 or larger), and keep your shutter speed above 1/400s by choosing an ISO that allows you to do this.

This what you're asking?

[danaitch]

The only answer I can come up with is "f2.8".

If you can shoot on aperture priority, ensure you're setting an ISO for you to reach at least 1/500th of a second, maybe 1/640th, you'll be ok... depending on what effect you're trying to achieve.

And there starts the next lecture... :D

I feel this one could run and run. ;)

[ItzBitzHair]

Yes thatis basically what I am asking. I have been at iso 1600 want to adjust down at least 800 or less so i am looking for a way to make this happen and und the ratio of these so I am able to go in any venue and make the right light settings to get where I am trying to get a lot fast that I have been.





Hair - not sure what you're asking. As I use them, EV's are just ways of equating exposure conditions by changing parts of the exposure triangle:

http://www.pbase.com/dmwierz45/image/92707031.jpg

As in ISO800 f/4.0 and 1/500s has the same EV as ISO200 f/2.8 and 1/250s.

I don't know of an "ideal" value. The classic EV formula is a base-2 log of the ratio of the aperture squared divided by the shutter speed. Notice ISO isn't mentioned as it is consider to be a constant, which in reality, it rarely is (might be a holdover from the film days when ISO was sort of a constant - now that we have digital cameras that can change the ISO with the turning of a dial, the concept of EV is of less value).

When I have seen numbers given to EV, they have been at a fixed ISO, like 100. This isn't much use to a sports shooter, as you rarely shoot at ISO100.

So, in order to have meaning, you'd have to say "An EV of 12 at ISO400" or something like this, not just "What EV should I shoot at?".

But let's not worry about something as esoteric as "EV". Generally, in sports photography, you want to keep your lens almost wide open to isolate the subject and blur the background (usually f/4.0 or larger), and keep your shutter speed above 1/400s by choosing an ISO that allows you to do this.

This what you're asking?

[ItzBitzHair]

and where does wb fit into it.. will that adjust your photo any.. i have a game today and I am going test awb and maual gonna try to get the little thing you use to set it before tonight.

[JeffreyG]

Yes thatis basically what I am asking. I have been at iso 1600 want to adjust down at least 800 or less so i am looking for a way to make this happen and und the ratio of these so I am able to go in any venue and make the right light settings to get where I am trying to get a lot fast that I have been.

Aperture, ISO and shutter speed are all reciprocal in nature, and they work in doublings. Each doubling is a "stop".

Some full stops in shutter speed:
1/60 - 1/125 - 1/250 - 1/500 - 1/1000 - 1/2000

Some full stops in aperture:
f/1 - 1.4 - 2 - 2.8 - 4 - 5.6 - 8 - 11 - 16

Some full stops in ISO
100 - 200 - 400 - 800 - 1600

To your specific question, suppose that for the exposure you want your settings are f/4, 1/500 and ISO 1600. Now if you want to use ISO800 you will have to change one of the other two settings one full stop.

So you need to either change the aperture to f/2.8 or the shutter speed to 1/250 to offset that one full stop less sensitivity.

Also note that your camera will allow you to work in 1/3 stop increments. So between f/2.8 and f/4 you find f/3.2 and f/3.5 etc etc.

[Cody21]

Jeff - in your example, if my current ISO=1600 and I want to halve it to 800, wouldn't I want my SS to go down a stop to 1/1000 ?? I see the point of f/4 to f/2.8 -- as we need to let more light into the lens to compenstate for the 1-stop reduction in light.

[JeffreyG]

Jeff - in your example, if my current ISO=1600 and I want to halve it to 800, wouldn't I want my SS to go down a stop to 1/1000 ?? I see the point of f/4 to f/2.8 -- as we need to let more light into the lens to compenstate for the 1-stop reduction in light.

Nope. These things don't all move in the same direction magnitude wise.

Higher ISO levels mean more sensitive. This means when you move up in ISO you can take aperture or shutter speed steps that let in less light (and vice-versa).

Higher aperture numbers mean a smaller hole in the lens and thus less light passes.

Faster shutter speeds (higher number on the bottom) means less light passes.

We started our example at ISO1600, f/4 and 1/500.

If you increase the ISO from 1600 to 3200, you could go from 1/500 to 1/1000 shutter speed. But since instead you want to go from ISO1600 to 800 the shutter speed has to go the other way, to 1/250.

Equivalent Exposures:
1600 f/4 1/500
800 f/2.8 1/500
800 f/4 1/250
800 f/8 1/60
1600 f/1.4 1/4000

And just for fun:
800 f/3.5 1/320

In the last one I made up for the 1 full stop change in ISO by opening the aperture 1/3 stop and slowing the shutter speed 2/3 stop.

[ItzBitzHair]

I will be testing severl different examples of this tonight.. The first round of state is tonight. We Host........

I will post pix later tonight.

[PhotosGuy]

Basically Sports and Studio.. There IS no ideal. The only answer I can come up with is "f2.8". Good place to start if you cant get f/2 or faster.

You might read through these for some ideas: Sports Shooting Tutorials and Advice (http://photography-on-the.net/forum/showthread.php?t=135417)

[ItzBitzHair]

yes you are correct i will be getter several new lenses for this purpose.

a 50mm 1.8 and a 65mm and then i need one more that will give me a range with an fstop of 2.8 or better. hopefully 1.8 I am looking and making my list today so i can order tom. Need it by wednsday



There IS no ideal. Good place to start if you cant get f/2 or faster.

You might read through these for some ideas: Sports Shooting Tutorials and Advice (http://photography-on-the.net/forum/showthread.php?t=135417)