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General discussion

Seeking advice on settings for DREBEL - what did I do wrong

by Acts7 Dec 19, 2004 1:56AM PST

Snapshot2 and any else who could offer assistance:

I noticed in another thread that you suggested setting the iso to 1600. Why would you ever use something that high as opposed to adjusting one of the other settings? When I set my drebel to 1600 I get a large amount of noise even in daylight.

If you get a chance would you mind taking a look at this and tell me what I should have done differntly 'cause to me this is REALLLY messy looking.

http://www.sftcministries.com/imageHelp/

The first is an outdoor shot with flowers in the sunlight (some shadows)

The second is ornaments on a lighted christmas tree.

Thanks

Acts7

Discussion is locked

5 Posts
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There is no need to use 1600 in good light conditions
by Kiddpeat Dec 19, 2004 3:49AM PST

just as you would not use a 1600 film in bright sunlight. You use it in low light conditions when there is motion. It gives you a faster shutter speed to help minimize the blur that the motion normally causes. 1600 does, of course, turn up the image amplification which increases noise.

BTW, I've read the Kodak has a PS plug-in to reduce noise in an image.

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iso vs f/stop
by Acts7 Dec 19, 2004 4:06AM PST

so would you call the instance of the lighted Christmas tree "low light"? since I am focusing on the ornament and not on the light. I guess what Im asking is in general when direct light entering the lens is unavoidable - do you increase the f/stop as opposed to increasing the iso?

Grr Ive read many a post on here and still confused as to what the REAL benefit is of iso vs f/stop and in which situations. Theoreticly I know iso does one thing and f/stop another. but what is there true benefit (whats an example of a situation where a higher f/stop would be better than a higher iso)? and vice versa?

I have a little better understanding of aperature because it has to do with dof.

Thanks in advance.

Acts7

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ISO
by snapshot2 Forum moderator Dec 19, 2004 6:18AM PST

Yes it is confusing:


Here is a link that will help you understand the relationship between f-stops, shutter speed, and ISO:

http://www.pbase.com/otfchallenge/the_basics

When you have to shoot with high ISO you will get noise (with film, it is called grain).
Here is a link to a free noise filter.
Find your photo with the most noise and use the filter on it, you will be surprised.

http://www.imagenomic.com

Download the free "Noiseware Community Edition"

...
..
.

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ISO refers to how sensitive the film is to light. F-stop
by Kiddpeat Dec 19, 2004 12:54PM PST

indicates the size of the aperture (lens opening). It controls how much light gets into the camera in a given period of time. A higher ISO means a greater sensitivity to light meaning it doesn't take as much light to form an image.

Digital cameras will adjust the exposure time to compensate for low light. Thus, they can use a low ISO by keeping the shutter open longer. This works fine as long as nothing moves while the lens is open. If things in the image are moving, then the shutter must be closed quickly to avoid blurring. A high ISO makes it possible for the lens to close more quickly.

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starting to see the light
by Acts7 Dec 19, 2004 11:35PM PST

Thanks!

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