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How to change ISO setting of camera on K750 and similar |
max_wedge
Joined: Aug 29, 2004
Posts: > 500
From: Australia
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There is no actual menu setting to change the iso value when using the K750 camera.
The ISO is automatically set by the camera depending on the exposure and whether the light or night mode are in use. So by understanding how those factors affect ISO value, you will have a high degree of control over the ISO value.
High ISO's are chosen by the camera when there is low light available. So use combinations of night mode (slows shutter speed) and the camera light to get more light on the situation and reduce ISO.
It would be logical that a high exposure value would also help with light, how ever the oppositte is true. A high exposure value causes a high ISO, since the camera doesn't have a physically adjustable aperture to allow more light onto the cmos.
So also keep exposure as low as you can get away with to reduce ISO.
There are trade-offs in using exposure, night mode and light to change ISO. For example, if you want low iso in certain circumstances, then you might have to accept an under-exposed picture (decrease exposure value to decrease iso), or a blurry photo (use night mode to reduce iso), or use the camera light (also decreases iso).
In my tests, White Balance didn't have any affect on iso.
Test Results
Normal (white balance auto):
-2EV ISO 640
0EV ISO 800
+2EV ISO 1600
Night mode (white balance auto):
white balance setting has no effect when night mode is used
-2EV ISO 320
0EV ISO 800
+2EV ISO 1600
Night mode and light:
0EV ISO 200
White Balance (0EV, night mode off):
Auto ISO 800
Daylight ISO 800
Cloudy ISO 800
Fluorescent ISO 800
Incandescent ISO 800
ISO results were all obtained using identical camera settings and picture composition, changing only the values being tested at each exposure level (EV). Different picture composition will affect light levels and therefore ISO levels, but results will be consistant with respect to the relative relationship of ISO to high and low exposure values.
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[ This Message was edited by: max_wedge on 2006-02-28 16:34 ] |
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dima69
Joined: Feb 11, 2006
Posts: 92
From: Israel
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Thanks, this is very useful information! |
max_wedge
Joined: Aug 29, 2004
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From: Australia
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Cool, thanks.  Eventually I'll post the pics for the test runs to my review site.
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curmurdar
Joined: Dec 04, 2005
Posts: 109
From: Constanta , Romania
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Thanks for the informations max_wedge ! Very usefull. |
lexus
Joined: Jan 24, 2002
Posts: 308
From: Montenegro
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Nice 1, thank you! |
Supa_Fly
Joined: Apr 16, 2002
Posts: > 500
From: Toronto, Ontario
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Great information but I swear I think you're speaking a foreign language to my eyes! I have no clue what you just said in terms of what would be better for taking pictures in low light level.
All I get is if night mode is on and if the LED would have no effect then I can tell what Im shooting at but in low light with LED no nite mode; then I'll get what the light can shine on.
|AppleTV2|iPhone 12Mini 256GB|iPad Pro 256GB| Previously ...  K750|Z500|Z520|K700|K790i|K850i, :Ericsson: T18z|T28World|T36m x3|T68m (Ericsson, not the rebranded T68i). |
max_wedge
Joined: Aug 29, 2004
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From: Australia
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prom1, a lower iso results in far less noise in the final image - so if you know how to keep the iso rating low, then you will ensure your pictures suffer less from the "white lines in low light" affect that many people complain about. You will also get a clearer image with less general noise.
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rockygali
Joined: Nov 21, 2005
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since White Balance cant affect ISO in K750... thus this mean we can get enuff help from other light source? (i.e. sun, lamp, spotlight etc)
on the otherhand.. what does the role of ISO with regards to monitor/screen/tv flickering... in the case below.. using R1BC FW the monitor didnt flicker.
White Balace: AUTO | MACRO Mode
White Balance: AUTO | Normal Mode Fine Quality
i want to learn how to control ISO. and i have some queries on the other hand.. is White Balance referred to as Exposure? What is ISO in laymen's term?
much thanx!
"Darkness is the absence of light.. and not the opposite..." |
max_wedge
Joined: Aug 29, 2004
Posts: > 500
From: Australia
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White Balance is merely the colour temperature. So for example under fleuro lights (which emits a blueish light) white balance corrects for this extra blue, warming the colours so that the picture looks more natural. Under incandescent lights, which emit a yellowish light, the white balance cools the colours so that the picture isn't too yellow. White Balance has no affect on exposure. It's an onboard adjustment of the colour temperature of the image (as opposed to using software to achieve the same thing after the fact).
There is no equivalent to White Balance adjustment on film based cameras. White Balance is a feature that corrects for inherrent flaws in the ccd/cmos technology.
ISO is the sensitivity of film (or in our case the CMOS chip). The more sensitive, the less light is needed for a correct exposure. However the higher the ISO, the more grain (on film) or noise (on cmos/ccd chips) is introduced into the picture. So while a higher ISO allows better exposure in low light, it also increases grain or noise.
EXPOSURE is "light balance". If the picture is too dark then the photo is said to be under-exposed, if it is too bright it is said to be over-exposed. The higher the exposure rating the more light will be allowed to fall on the subject. On the K750, which doesn't have an adjustable aperture (the width of the hole which light passes through to strike the cmos chip), this is automatically controlled by shutter speed and ISO. Higher Exposures lead to more noise (unless you have a physically adjustable aperture, such as on a digital SLR).
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[ This Message was edited by: max_wedge on 2006-03-13 22:03 ] |
rockygali
Joined: Nov 21, 2005
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darn... such good words man... havent been reading alot about photography for its very technical lingo. but the way you lay it out.. OK DUDE GOT THA POINT!
now this will really help me alot.. thanks for the patience maxie!
and about the screen flickering when being focused at... i have noticed this on the R1BC, how come it can omit those flickering effects when being focused on a monitor or television screen? is that an improvement for the said firmware?
EDIT: whoops maybe i was wrong about the flickering... the K750 only flickers when it is being focused on a monitor having whte background or any white color in it... after tests.... ive learned that when focusing on a monitor with many color variants then K750 doesnt flicker. but when i tried focusing on a white background it started to flicker... ok got that...so this flickering relates to ISO?
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[ This Message was edited by: rockygali on 2006-03-14 01:49 ]
[ This Message was edited by: rockygali on 2006-03-14 01:56 ] |
max_wedge
Joined: Aug 29, 2004
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From: Australia
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I'm not sure, but my guess is the flickering results because the cmos refresh rate is close to the monitor refresh rate (so like a strobe, it "slows down" the flickering to the point that it's visible).
Hey, glad I could clear up some photography principles for you! Having spent many years doing computer support, I learnt to speak in "plain english" 
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[ This Message was edited by: max_wedge on 2006-03-14 13:51 ] |
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Posted: 2006-02-28 17:18
K750|Z500|Z520|K700|K790i|K850i, :Ericsson: T18z|T28World|T36m x3|T68m (Ericsson, not the rebranded 
