LHSebi
Topic Author
Posts: 1007
Joined: Wed Jan 07, 2004 4:24 am

When To Change ISO Speed

Sun Jul 18, 2004 10:28 am

Hi all,
I have been wondering on my recent photo outings to the airport, when I should change the ISO speed. I have a 300D btw, with the 75-300IS lens. I seem to be having a slight problem when I shoot with ISO 100, since I set the aperture to 9-11, and I usually still get slightly blurred pictures when I shoot aircraft in action (landing/taking off). This, I believe is due to the fact that the time value gets set too low. Wouldn't an ISO of 200 help? Does the image quality drastically decrease, so that they would be useless for a.net? Any help is appreciated!

Sebastian  Big thumbs up
I guess that's what happens in the end, you start thinking about the beginning.
 
hisham
Posts: 682
Joined: Fri Aug 20, 1999 11:32 pm

RE: When To Change ISO Speed

Sun Jul 18, 2004 11:39 am

ISO 200 is barely distinguishable from 100 coming out of a Canon DSLR. When in doubt, bump it up to 200. Here are a couple examples...


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Photo © Hisham Atallah
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Photo © Hisham Atallah



With your lens at 300mm, I think you'll get better resolution at F/11 ISO 200 than at F/5.6 ISO 100.


Hisham.
 
jderden777
Posts: 1677
Joined: Fri Jan 21, 2000 9:56 am

RE: When To Change ISO Speed

Sun Jul 18, 2004 12:00 pm

also try setting the camera to Av and set the aperture to f8...that will give you the sharpest results out of that lens (i have the same lens, with a 10D)

anytime you think you just need some extra shutter speed just in case, bump up the iso to 200...the difference between 100 and 200 is negligible anyway (like Hisham said above) 200 provides just a little bit extra security i guess than 100

jonathan d.
"my soul is in the sky" - shakespeare
 
LHSebi
Topic Author
Posts: 1007
Joined: Wed Jan 07, 2004 4:24 am

RE: When To Change ISO Speed

Sun Jul 18, 2004 9:57 pm

That's great. Thanks a lot!

Sebastian
I guess that's what happens in the end, you start thinking about the beginning.

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