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How to Photograph your Rig - Page 14

post #131 of 976
Quote:
Originally Posted by Marin View Post
Not going to search through the thread but you should also talk about ISO. Since some members have their P&S camera at ISO 800 and it's as noisy as hell.
I, for one, don't understand ISO at all. I'd love some help with that.
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post #132 of 976
Quote:
Originally Posted by Marin View Post
Not going to search through the thread but you should also talk about ISO. Since some members have their P&S camera at ISO 800 and it's as noisy as hell.
I dislike iso, especially when seriously shooting, if that makes sense. I mean, with a tripod, the iso should be as low as possible, right?

And sorry for noob question, but how do you adjust iso on a D-SLR? I have a Nikon D80. I read through half the manual and haven't found anything on ISO's, although it's the first setting I learned on point-and-shoots.

Edit:

Quote:
Originally Posted by Wiremaster View Post
I, for one, don't understand ISO at all. I'd love some help with that.
iso is the sensitivity of the sensor. It's like getting poked either in your foot or your eyeball. Obiviously you notice more and react faster if you get poked in the eye ball. therefore, you require less exposure time, but sacrificing an eyeball, or image quality. You see little grainy stuff. However, when you get poked in the foot, you take longer to realize that you are getting poked, therefore more exposure time is taken, but you get a better image quality and less grain.

I think that's what it is. Please correct me if I'm wrong. And yes, I do explain terribly.
Edited by max it - 1/13/11 at 5:22pm
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post #133 of 976
far out , nice case op =D very sexy .
    
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post #134 of 976
Quote:
Originally Posted by Wiremaster View Post
I, for one, don't understand ISO at all. I'd love some help with that.
Iso used to be how light sensitive film was. Now it's the lght sensitivity of the image sensor. High iso, more sensitive and more noise. But because it's more sensitive you can have faster shutter speeds which usually means less shaky images.
post #135 of 976
Quick Guide to Understanding ISO "Speed"

Written by Elizabeth Giargiari, Cameratown.com

A camera has to make a lot of decisions when you press the shutter button. It needs to determine the brightness of the scene and the distance of subjects in order to set the camera's ISO, aperture, shutter and focus. This all happens within milliseconds. It is these settings that I'll explain in order to give you a better understanding of how they affect your final captured image.

ISO Sensitivity:
A camera's ISO function sets the light sensitivity of the camera's image sensor (this is similar to the speed rating of FILM). ISO settings are often rated at 100, 200, or 400 but go as high as 800, 1600, and even 3200 on some advanced models.

A lower ISO setting is used when capturing overly bright scenes, since it reduces the light sensitivy of the image sensor. This is ideal when shooting at the beach, on a ski slope, or under the midday sun. A higher ISO settings is often used when shooting under dimmer conditions (cloudy days, indoors, etc.) since it increases the light sensitivity of the image sensor.

As brightness in a scene is decreased the camera tries to compensate by slowing the shutter speed which in turn lets in more light but increases the risk of motion blur. To prevent this, you can increase the ISO or sensitivity of the camera, which allows the camera to select a higher shutter speed, thus reducing motion blur.

Why not just use a higher ISO all the time?


While using a higher ISO setting is often needed to capture images with reduced blur in lower light, it also increases the noise level of the image (In film this is often referred to as "grain"). A lower ISO setting is preferred whenever possible since it helps to reduce this noise or grain.
ISO settings can also be used to help control the shutter speed of a camera while in automatic mode.

In order to "freeze" motion in a scene, a camera needs to be able to use a higher shutter speed. By selecting a higher ISO you are allowing the camera to gather more light, this automatically forces the camera to select a higher (faster) shutter speed, which helps to reduce motion blur.

With film, the ISO rating is considered a "speed" rating. ISO 100 would be considered a slow film, while ISO 400 would be considered a faster film. Digital cameras obviously don't use film thus the ISO number corresponds to the image sensor's light sensitivity.

ISO 100: Great for bright sunny days, at the beach or on the snow. Produces clean images that are great for enlargements. ISO 200: Great for overcast daylight pictures (noise levels may increase, but in most cases not noticeably) ISO 400: Great for lower lighting conditions (indoors, night time) or when you need to capture faster moving subjects in lower lighting conditions. In many consumer cameras, ISO 400 can make photos look very noisy in dark areas of the picture.

The reason a higher speed ISO helps you capture fast moving subjects is because a higher ISO makes the image sensor of the camera more light sensitive. This forces the camera to use a higher shutter speed to compensate for the extra brightness, which in turn helps to "freeze" movement in the captured frame.



In the above example I set my camera to a fixed shutter speed of 1/200th of a second and the aperture value to f/5.0. I then changed the ISO setting
for each photograph to demonstrate how a faster ISO setting can make the camera more light sensitive.




This example demonstrates increased noise (and depth-of-field) in a photograph as you increase the ISO. This example was shot using a Canon EOS-10D which is known to have very little noise at higher ISO's when compared to consumer level digital cameras. As you can see, the photograph on the far right has increased noise (grain) but is also a bit more in focus.

I focused and zoomed the camera in on a tree (bottom left corner) which was about 80 feet in front of the garage (window). The higher ISO setting allows the image sensor of the camera to be more light sensitive. It also allows the camera to set a smaller aperture which helps it to achieve a greater depth of field. This is why the Window is a bit more in focus in the photo on the right.
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post #136 of 976
Supreme, thanks for the excellent tutorial!

I'm going to get cracking with my friend's photography kit that is stored at my place

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post #137 of 976
Quote:
Originally Posted by Boyboyd View Post
Iso used to be how light sensitive film was. Now it's the lght sensitivity of the image sensor. High iso, more sensitive and more noise. But because it's more sensitive you can have faster shutter speeds which usually means less shaky images.
Now I just learned something new! Can I ask, can this method be good for taking photos regularly of items?

So if I wanted to capture a crazy fast action shot, like racing, do I use a higher ISO? But if it's a still thing like flowers, I go lower Iso right?

EDIT: NVM, Once I posted, the answers shows.
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post #138 of 976
You would also need to adjust your shutter speed and aperture since you are taking a picture of something that is moving really fast vs something that is standing still.
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post #139 of 976
Took your advice and took a couple of pictures. Here they are





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post #140 of 976
Good guide thank you, I am definitely guilty of taking horrible pictures of cool stuff.
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