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General photography questions and answers: Discuss Regarding basics:::Shutterspeed,Aperature and ISO...Hi all, I am new to photographic world and as suggested I am spending most of my time in educating ...
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Old 15-05-2009, 10:46   #1 (permalink)
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Regarding basics:::Shutterspeed,Aperature and ISO

Hi all,

I am new to photographic world and as suggested I am spending most of my time in educating myself in basics.I just google the terms and try to grasp as much as possible.

Now that I learnt, Aperature,shutterspeed and ISO all are measured by a common unit "STOP".
If I consider old manual camera with a film reel(not digital), the ISO is fixed.
So we can only change aperature and shutterspeed to control the quantity of light reaching the film.i.e If I increase the shutterspeed by 2 stops then I have to decrease the aperature by 2 stops so as to get the same amount of light as before.I know ISO is the standard that measures how much sensitive a film is to light.ISO800 film will require less light to take a photo as compared to ISO400 film.

Following the same concept,
1.Can I fix my digital SLR's ISO at 100 or 200 and take any photo with any lighting condition???
2.How important is the ISO in digital cameras?
3.How is ISO related to Shutterspeed and Aperature??

Thanks in advance.
Bishnu
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Old 15-05-2009, 13:29   #2 (permalink)
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Re: Regarding basics:::Shutterspeed,Aperature and ISO

With most Nikon cameras the lowest ISO you can set is 200. You only need to raise it in low light conditions where you cannot get the correct exposure with the slowest shutter speed and widest aperture settings you want to use or when shooting action and cannot use a fast shutter speed. In your case ISO 200 will be fine unless you have such bright light you cannot get the results you want without lowering it. In this case if your minimum is ISO 200, a neutral density filter will be required.

Raising the ISO will make your shots more noisey - just as fast ISO film was more grainy. The ISO will go up and down by either half a stop or one third of a stop depending on how you have set up your camera.

For all normal use ISO 200 will be fine. One stop faster will be ISO 400, and two stops faster is ISO 800.

Rob Barron (and others) has some great tutorials in our Tutorials and Guides Forum

Tutorials and Guides - Pixalo Photography Community

Here are a few that might be of interest

http://www.pixalo.com/community/tuto...tml#post171670

http://www.pixalo.com/community/tuto...tml#post179240

http://www.pixalo.com/community/tuto...tml#post180547

http://www.pixalo.com/community/tuto...tml#post179230

http://www.pixalo.com/community/tuto...tml#post211905

http://www.pixalo.com/community/tuto...tml#post231489
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Old 15-05-2009, 14:21   #3 (permalink)
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Re: Regarding basics:::Shutterspeed,Aperature and ISO

Thanks again Graham....Why is it every time you only come out to rescue me??

In fact I was expecting the reply from you only.

I will go through the tutorials and repost any queries I have.

Bishnu
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Old 18-05-2009, 13:41   #4 (permalink)
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Re: Regarding basics:::Shutterspeed,Aperature and ISO

Quote:
Originally Posted by bishnu.bhatta View Post
Hi all,


Following the same concept,
1.Can I fix my digital SLR's ISO at 100 or 200 and take any photo with any lighting condition???


Thanks in advance.
Bishnu

I'm not sure if your camera sets the ISO to automatic or not. On my Canon 50D it is set to this by default, so it varies the ISO each shot - called Auto ISO.

I prefer to set my ISO to a fixed number eg 100, and then use AV mode, which sets the shutter speed for me depending on the aperture I've selected on the lens, and the available light, but the ISO stays at my fixed number.
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Old 19-05-2009, 01:38   #5 (permalink)
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Re: Regarding basics:::Shutterspeed,Aperature and ISO

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Originally Posted by chrisa View Post
I'm not sure if your camera sets the ISO to automatic or not. On my Canon 50D it is set to this by default, so it varies the ISO each shot - called Auto ISO.

I prefer to set my ISO to a fixed number eg 100, and then use AV mode, which sets the shutter speed for me depending on the aperture I've selected on the lens, and the available light, but the ISO stays at my fixed number.


On the 350D, on fully Auto, the ISO changes shot by shot, but on the manual modes, you can set the ISO from 100, 200, 400, 800, and 1600....
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