Phish Photography 5:00pm, 28 August 2007
Hi all.
I have an interesting question about auto mode with high ISO.

This picture was take in auto mode.
ISO 800 5MP
DSC00127.JPG

This one was taken in full manual mode.
ISO 400 5MP
DSC00412.JPG

How come i have more noise in a picture with ISO 400 that was in a manual mode than a picture that was taken in auto mode and ISO 800?
David Aseer 11 years ago
Ok.. Vlad ..
Thats a quick read... talks about the relationship between ISO/Shutter and Aperture
www.digital37.com/photography/

Now this is the EXIF of the 2 pic... AUTO and MANUAL.. in that order

Exposure Aperture Focal Length ISO Speed Exp. Val
0.2 sec (1/5) f/2.8 7.1 mm 800 0/10 EV

30 sec (30) f/3.5 5.2 mm 400 0/10 EV


does it make sense ?
Phish Photography Posted 11 years ago. Edited by Phish Photography (member) 11 years ago
speshalyst Well, Yes this is the order and the EXIF of the shots.
David Aseer Posted 11 years ago. Edited by David Aseer (member) 11 years ago
hey Vlad did u get a chance to read that link .. give u a basic idea of how these things relate..

another one..
www.canon.co.jp/imaging/enjoydslr/p_3_007.html


Take a look at this article... which says :
www.photoxels.com/tutorial_noise.html

What Can You Do ... to reduce noise?

There are a number of things to remember about noise:


* A slow or long exposure introduces noise. -
* A higher ISO introduces noise.

So the pic taken in Manual mode has a Shutter at 30 Secs with 400 ISO ..... this combination was conducive to the increase in noise.
Phish Photography Posted 11 years ago. Edited by Phish Photography (member) 11 years ago
speshalyst Thank you for the explanation.
David Aseer 11 years ago
My Pleasure ... Vlad ...
sycophill 11 years ago
I was told that having the LCD Display on will also add noise as it's adding more heat to the sensor?
Phish Photography 11 years ago
The more electronic cycles you have on, the more noise you get. It caused by the noise that the electronic cycle produce.
But its pretty minor i think.
Honzie Posted 11 years ago. Edited by Honzie (member) 11 years ago
Yea, the smaller your aperture, the more evident the ISO will become. Although the two pictures had a one step aperture difference, exposure is what really played its role in this one. I don't remember where I saw it at but theres a chart that shows you a bunch of pictures but every picture looks the same yet each picture was taken at different settings.
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