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Old May 23, 2006, 7:36 AM   #21
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sojouner wrote:
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... I tried iso 400 thru to 1600 quite grainy??? also I had my camera set on manual and could not get it to stay on 3.5 for AV kept jumping to 4.5 or 5.6 rendering the photos very dark even with flash ...
This probably because you're using a variable aperture zoom (and why constant aperture is desirable)
-> as you zoom in the lens aperture changes from f/3.5 to f/5.6 forcing the camera to up its minimum aperture, and making the overall exposure darker (especially on manual because the camera does not change the exposure to match the smaller opening of the diaphram), and when underexposed an image is noisier than normal: http://www.stevesforums.com/forums/v...mp;forum_id=37

As to the flash the same thing can happen when its reach is exceeded - Are you using the built-in flash? The camera's flash can not go very far and an external flash is normally required on a long tele...
i.e. always get the highest GN (aperture x distance) flash that you can afford! :idea:

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Old May 23, 2006, 7:01 PM   #22
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drewaz wrote:
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I'm not sure if this will be helpful to you, but I ran #1 thru Noise Ninja .....
I am still very new to all this so I have a dumb question:

Do you run your digital photo through noise reduction software before you do any other touch up or afterwords for best results???
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Old May 24, 2006, 7:01 AM   #23
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sojouner wrote:
"... I tried iso 400 thru to 1600 quite grainy??? also I had my camera set on manual and could not get it to stay on 3.5 for AV kept jumping to 4.5 or 5.6 rendering the photos very dark even with flash ..."

This probably because you're using a variable aperture zoom (and why constant aperture is desirable)
-> as you zoom in the lens aperture changes from f/3.5 to f/5.6 forcing the camera to up its minimum aperture, and making the overall exposure darker (especially on manual because the camera does not change the exposure to match the smaller opening of the diaphram), and when underexposed an image is noisier than normal: http://www.stevesforums.com/forums/v...30&forum_id=37

As to the flash the same thing can happen when its reach is exceeded - Are you using the built-in flash? The camera's flash can not go very far and an external flash is normally required on a long tele...
i.e. always get the highest GN (aperture x distance) flash that you can afford! "
Thanks NHL for the reply .
Flash was not camera one ,was speedlite220ex That I got with the Camera.
Is the standard lense that you get with camera (18-55) a variable aperature zoom lense?
I will be shooting in jpg and raw format from now on so that I can tweek photos better. Jpgs not easy to brighten from dark (unless the gurus out there have advice)Have photoshop 7 and photoshop elements 2.0 so a link to a thread discussing this would be mavellous
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Old May 24, 2006, 8:07 AM   #24
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sojouner wrote:
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Is the standard lense that you get with camera (18-55) a variable aperature zoom lense?
Yes it's a variable aperture zoom -> That's why the camera adjust upward as you zoom from 18mm (f/3.5) to 55mm (f/5.6)



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Flash was not camera one ,was speedlite220ex That I got with the Camera
The 220EX has a GN of 22 (in meter) @ ISO 100. Hence it's maximum reach is around ~3.9m (22 divided by 5.6) anything beyond that range will be undexposed (and grainy/noisy as a result)

-> For comparison:
o A 430EX will have a reach of 7.6m (43/5.6) instead
o and a Sigma 550DG will have a reach of 8.9m (50/5.6), which is more than twice the range of your current flash


IMO your problem is in the lighting department - Any fix in Photoshop (either raw or jpeg) is only a patch, and you are not fixing the real culprit. i.e. better illumination or faster lenses...
-> Photography is all about lighting (or the capture of) :idea:
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