Comments on: Photography 101.7 – ISO http://digital-photography-school.com/photography-1017-iso Discover how to use your digital camera with our Digital Photography Tips. We are a community of photographers of all experience levels who come together to learn, share and grow in our understanding of photography. Sat, 21 Nov 2009 12:17:12 -0500 http://wordpress.org/?v=2.8.5 hourly 1 By: malayvahan http://digital-photography-school.com/photography-1017-iso/comment-page-1#comment-58050 malayvahan Mon, 27 Jul 2009 11:35:04 +0000 http://digital-photography-school.com/?p=5080#comment-58050 i wish i could attend the classes i wish i could attend the classes

]]> By: Char http://digital-photography-school.com/photography-1017-iso/comment-page-1#comment-50145 Char Thu, 07 May 2009 12:07:02 +0000 http://digital-photography-school.com/?p=5080#comment-50145 Thank you for the valuable lessons. Looking forward to the next one. Thank you for the valuable lessons. Looking forward to the next one.

]]> By: Sarah http://digital-photography-school.com/photography-1017-iso/comment-page-1#comment-48496 Sarah Mon, 20 Apr 2009 02:46:28 +0000 http://digital-photography-school.com/?p=5080#comment-48496 I've just started playing around a lot with ISO lately. So many people seem to want to leave it down around 100, when I generally keep it at 200-400. I figured out why however at my son's last tball practice - my children are just too fast. I need fast shutter speeds to capture them and unless it's super sunny out, that means I need the 400 to catch them in action and have a lot fewer blurry shots. After photographing them so much I realize why I'm always so tired at the end of the day - they never hold still! *L* I’ve just started playing around a lot with ISO lately. So many people seem to want to leave it down around 100, when I generally keep it at 200-400. I figured out why however at my son’s last tball practice – my children are just too fast. I need fast shutter speeds to capture them and unless it’s super sunny out, that means I need the 400 to catch them in action and have a lot fewer blurry shots. After photographing them so much I realize why I’m always so tired at the end of the day – they never hold still! *L*

]]> By: Sybren http://digital-photography-school.com/photography-1017-iso/comment-page-1#comment-48144 Sybren Fri, 17 Apr 2009 08:19:31 +0000 http://digital-photography-school.com/?p=5080#comment-48144 What I miss in this bog post is what I miss in most explanations of ISO: the effect on the colours. Higher ISO doesn't just give you more noise, it also makes the colours less saturated, more bland. This may be an important factor for you to choose a lower ISO setting. What I miss in this bog post is what I miss in most explanations of ISO: the effect on the colours. Higher ISO doesn’t just give you more noise, it also makes the colours less saturated, more bland. This may be an important factor for you to choose a lower ISO setting.

]]> By: tzjiang http://digital-photography-school.com/photography-1017-iso/comment-page-1#comment-47989 tzjiang Thu, 16 Apr 2009 16:45:31 +0000 http://digital-photography-school.com/?p=5080#comment-47989 Nice Article. I agree with Tigraine. Neil, can you post the EXIF data(at least the ISO) for those 2 pictures. Only the stars has EXIF. Thanks Tzjiang Nice Article. I agree with Tigraine. Neil, can you post the EXIF data(at least the ISO) for those 2 pictures. Only the stars has EXIF.
Thanks

Tzjiang

]]> By: Macro Photography http://digital-photography-school.com/photography-1017-iso/comment-page-1#comment-47945 Macro Photography Thu, 16 Apr 2009 15:26:00 +0000 http://digital-photography-school.com/?p=5080#comment-47945 These are great lessons. I learned some great and valuable information. These are great lessons. I learned some great and valuable information.

]]> By: Tom http://digital-photography-school.com/photography-1017-iso/comment-page-1#comment-47927 Tom Thu, 16 Apr 2009 13:32:28 +0000 http://digital-photography-school.com/?p=5080#comment-47927 Fletch, thanks for the feedback. You are obviously right. Exposure compensation will necessarily change aperture and shutter speed. Thanks for clarifying that one for me. And yes, we certainly need some way of determining the sensitivity of the sensor, whatever we may want to label the parameter. Myself, I did not think of the possibility of having an analogue adjustment of sensitivity, but I do look forward to it! Again, thank you for the clarification :-) Fletch, thanks for the feedback.
You are obviously right. Exposure compensation will necessarily change aperture and shutter speed. Thanks for clarifying that one for me.
And yes, we certainly need some way of determining the sensitivity of the sensor, whatever we may want to label the parameter. Myself, I did not think of the possibility of having an analogue adjustment of sensitivity, but I do look forward to it!
Again, thank you for the clarification :-)

]]> By: Jeffrey Kontur http://digital-photography-school.com/photography-1017-iso/comment-page-1#comment-47925 Jeffrey Kontur Thu, 16 Apr 2009 13:16:42 +0000 http://digital-photography-school.com/?p=5080#comment-47925 @Tom- Exposure Compensation is a slightly different animal than ISO. ISO is part of the exposure triangle (the other two parts being aperture and shutter speed.) From these, your camera determines "proper" exposure. Exposure compensation simply tells your camera to deliberately deviate from "proper" exposure and by how much. Essentially, you are telling the camera to deliberately over or under expose an image from what it thinks is the correct exposure. If you changed the ISO, you would change your camera's calculation of what aperture and shutter speed to use so that it could still arrive at a "proper" exposure but it would not know that you wish for it to purposely over or under expose from this baseline. After all, the camera is just a machine. @Tom- Exposure Compensation is a slightly different animal than ISO. ISO is part of the exposure triangle (the other two parts being aperture and shutter speed.) From these, your camera determines “proper” exposure. Exposure compensation simply tells your camera to deliberately deviate from “proper” exposure and by how much. Essentially, you are telling the camera to deliberately over or under expose an image from what it thinks is the correct exposure. If you changed the ISO, you would change your camera’s calculation of what aperture and shutter speed to use so that it could still arrive at a “proper” exposure but it would not know that you wish for it to purposely over or under expose from this baseline. After all, the camera is just a machine.

]]> By: Fletch http://digital-photography-school.com/photography-1017-iso/comment-page-1#comment-47923 Fletch Thu, 16 Apr 2009 12:59:24 +0000 http://digital-photography-school.com/?p=5080#comment-47923 Tom - Exposure compensation is dfiferent from ISO. Exposure compensation will change shutter speed and aperture as well as ISO giving you an exposure that is different to the camera's metered exposure. ISO is still relevant in digital as you need some way of decribing the sensitivity of the sensor to light. It dies not need to be described in the same units as film and in 1 stop increments but since this is already familiar to photogrphers it makes sense to stick to it. However the is no reason that the sensor gain has to be constrained to 1 stop (or half stop/third stop) increments so mabe we will see a camera with continuously variable ISO like the volume dial on a sterio. http://jfletcherphoto.wordpress.com/2009/01/16/iso-in-beginner-speak-fast-or-slow-film/ Tom – Exposure compensation is dfiferent from ISO. Exposure compensation will change shutter speed and aperture as well as ISO giving you an exposure that is different to the camera’s metered exposure.

ISO is still relevant in digital as you need some way of decribing the sensitivity of the sensor to light. It dies not need to be described in the same units as film and in 1 stop increments but since this is already familiar to photogrphers it makes sense to stick to it. However the is no reason that the sensor gain has to be constrained to 1 stop (or half stop/third stop) increments so mabe we will see a camera with continuously variable ISO like the volume dial on a sterio.

http://jfletcherphoto.wordpress.com/2009/01/16/iso-in-beginner-speak-fast-or-slow-film/

]]> By: Tom http://digital-photography-school.com/photography-1017-iso/comment-page-1#comment-47882 Tom Thu, 16 Apr 2009 08:06:23 +0000 http://digital-photography-school.com/?p=5080#comment-47882 First of all: thanks for a good article! DPS is always well worth a read, I would guess for photographers of all levels. I have one question/thought - from a technical perspective, isn't ISO an outdated concept on digital cameras? It made sense with film, as different types of film have different sensitivities. But for digital, it's basically just about adding amplification to the signal from the sensor. And also, will not the exposure compensation we may use on our DSLR's act in much the same way? To my limited understanding, this also ought to raise the noise level as this is also an amplification of the signal from the sensor? Therefore, do we actually need the separation between ISO and exposure compensation? Nowadays isn't ISO just a way of keeping film users in an "familiar landscape", without no real meaning? Again, it's just a thought, and I might've gotten a few things wrong, but I'd appreciate some input on this. Thanks! First of all: thanks for a good article!
DPS is always well worth a read, I would guess for photographers of all levels.
I have one question/thought – from a technical perspective, isn’t ISO an outdated concept on digital cameras?
It made sense with film, as different types of film have different sensitivities. But for digital, it’s basically just about adding amplification to the signal from the sensor.
And also, will not the exposure compensation we may use on our DSLR’s act in much the same way?
To my limited understanding, this also ought to raise the noise level as this is also an amplification of the signal from the sensor?
Therefore, do we actually need the separation between ISO and exposure compensation? Nowadays isn’t ISO just a way of keeping film users in an “familiar landscape”, without no real meaning?
Again, it’s just a thought, and I might’ve gotten a few things wrong, but I’d appreciate some input on this.
Thanks!

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