shutter speed and bokeh?

[briancmo]

Does shutter speed effect image quality? I'm sur this is a stupid question, and I know how f stop changes depth of field, but how does shutter speed change your image? If at all?

[bohdank]

The faster the shutter speed the more you are able to freeze any movement in your subject.

Shutter speed only has an affect on DOF in that the faster the shutter speed the more wide open you have to open the shutter. It's the aperture, focal length and distance away from your target that defines your DOF.

[briancmo]

So for example (and as I say its in hypathetical world)

1 pic at 2.8 shutter speed 1/30th
2nd pic 2.8 shutter speed 1/200th (you raised your studio lighting but kept the same quality - hypathetically speaking)

would the DOF be the same?

[Hermeto]

So for example (and as I say its in hypathetical world)

1 pic at 2.8 shutter speed 1/30th
2nd pic 2.8 shutter speed 1/200th (you raised your studio lighting but kept the same quality - hypathetically speaking)

would the DOF be the same?
Yes.
If you didn’t change aperture, focal length and distance, DoF will be the same regardless of the shutter speed.

[texaskev]

Yip, Think shutter speed - freeze action. Apeture - depth of field.

[xarqi]

Take note that bokeh is not the same as depth of field, nor is it its inverse. Bokeh is the subjective quality of the parts of an image corresponding to parts of the scene outside the depth of field. It is determined by the design of the lens, in particular, the shape of the lens iris.

[JBaz]

There's a term in photography called Reciprocity of where you have your basic camera variables: shutter speed, aperture speed, and film speed (ISO/ASA).

- Shutter speed controls the duration (or time) of light hitting the film or sensor
- Aperture speed controls the intensity of light through the lens. This controls depth of field. Bokeh is the out of focus regions of a frame that produces a pleasant fore/background to isolate your subject. Lens construction also factors into play of Bokeh.
- ISO/ASA film speed controls the sensitivity of the light sensitive materials (film or sensor). The higher the ISO rating, the more sensitive the film is, but reduces your sharpness level and introduces more grain/noise into the picture. The size of your film or sensor also plays a factor in amount of grain/noise you will get.

Reciprocity refers to the inverse relationship between the intensity and duration of light that determines exposure of light-sensitive material. If you stop your aperture down from 2.8 to 4, you cut your light intensity in half and therefore have to compensate to either the shutter speed (slow it down say from 1/60th to 1/30th) or your film speed (stop it up from 100 to 200) to produce a proper exposure.

So for example (and as I say its in hypathetical world)

1 pic at 2.8 shutter speed 1/30th
2nd pic 2.8 shutter speed 1/200th (you raised your studio lighting but kept the same quality - hypathetically speaking)

would the DOF be the same?
As mentioned before, yes. That would produce the same DOF.

Also, The way how light physics works, the longer the focal length, the smaller the DOF will be at the same aperture. If you shot at 14mm at 2.8, you'll have more in focus than the same scene shot with a 300 at 2.8. DOF is also dependent on how large your sensor area is. You won't get same quality of DOF from a p&s at f/2.8 than a dslr at the same focal length and lens speed.

[xarqi]

Bokeh is the out of focus regions of a frame that produces a pleasant fore/background to isolate your subject.

No, bokeh is the character of the out of focus regions.

[jbuk1975]

Shutter speed only has an affect on DOF in that the faster the shutter speed the more wide open you have to open the shutter.


thats not strictly true as it all depends on the amount of light, but yes generally speaking if you shot the same scene and required a faster shutter you would usually need to open up the aperture, or you could raise the iso

[ed rader]

So for example (and as I say its in hypathetical world)

1 pic at 2.8 shutter speed 1/30th
2nd pic 2.8 shutter speed 1/200th (you raised your studio lighting but kept the same quality - hypathetically speaking)

would the DOF be the same?

yes.

ed rader