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#1
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How does ISO setting work?
The digital cameras that I have seen have a feature that allows the
user to choose an ISO setting. I would like to know what this feature does, since I suspect that it is useless. My concern is that setting a high ISO number simply 1. Causes the camera to take pictures that are quite dark 2. Post processes the picture by increasing the brightness, in software. If this is the case, then I prefer to increase the brightness myself, in Photoshop. On the other hand, if the ISO adjustment on the camera actually changes the physical properties of the photosensor, then it's a different story. I'd like some feedback on this before I spend my time experimenting with different ISO settings. -- David Arnstein |
#2
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iso settings are to do with how sensitive your sensor is to light , the
higher the iso setting i.e 400-800 1600 means you could take a photo in a dimmer room than iso 100 or 200. "David Arnstein" wrote in message ... The digital cameras that I have seen have a feature that allows the user to choose an ISO setting. I would like to know what this feature does, since I suspect that it is useless. My concern is that setting a high ISO number simply 1. Causes the camera to take pictures that are quite dark 2. Post processes the picture by increasing the brightness, in software. If this is the case, then I prefer to increase the brightness myself, in Photoshop. On the other hand, if the ISO adjustment on the camera actually changes the physical properties of the photosensor, then it's a different story. I'd like some feedback on this before I spend my time experimenting with different ISO settings. -- David Arnstein |
#3
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David Arnstein wrote: The digital cameras that I have seen have a feature that allows the user to choose an ISO setting. I would like to know what this feature does, since I suspect that it is useless. My concern is that setting a high ISO number simply 1. Causes the camera to take pictures that are quite dark 2. Post processes the picture by increasing the brightness, in software. If this is the case, then I prefer to increase the brightness myself, in Photoshop. On the other hand, if the ISO adjustment on the camera actually changes the physical properties of the photosensor, then it's a different story. I'd like some feedback on this before I spend my time experimenting with different ISO settings. -- David Arnstein ISO does not change the physical properties of the photosensor, it simply brightens the image as you suggest. There is, however, one crucial difference. It amplifies the signal before digitizing it, and this keeps down the quantization noise. -T |
#4
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Your-Nice wrote:
iso settings are to do with how sensitive your sensor is to light , the higher the iso setting i.e 400-800 1600 means you could take a photo in a dimmer room than iso 100 or 200. Not quite correct. The ISO setting doesn't change the sensor at all. It changes the amplification in the readout. I "David Arnstein" wrote in message ... The digital cameras that I have seen have a feature that allows the user to choose an ISO setting. I would like to know what this feature does, since I suspect that it is useless. My concern is that setting a high ISO number simply 1. Causes the camera to take pictures that are quite dark The picture won't come out dark unless oyu use the wrong ISO setting. Most digicams let you use auutomaic ISO setting as part of a point-and-shoot setting. It works properly most of the time. 2. Post processes the picture by increasing the brightness, in software. No. it increases the amplification by the camera's electronic hardware. If this is the case, then I prefer to increase the brightness myself, in Photoshop. You can do that up to a point. If the exposures are really bad, Photoshop or any progam can't do the job well. On the other hand, if the ISO adjustment on the camera actually changes the physical properties of the photosensor, then it's a different story. I'd like some feedback on this before I spend my time experimenting with different ISO settings. -- David Arnstein My suggestion to you is to not think of digital photography as a close analog of film photography. It is more diferent from film than film is from tintype. Each technology has its own advantages and drawbacks. The more you understand the one you are using, the better the results you will get. |
#5
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#6
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Could you please post in one group only...
-- Matti Vuori, http://sivut.koti.soon.fi/mvuori/index-e.htm |
#7
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In article ,
Matti Vuori wrote: Could you please post in one group only... I love usenet and I endeavor to be a "good citizen" in this space. I am very interested in your post. Would you please explain your reasoning. Here is mine: 1. My post is relevant to all three news groups. 2. By cross-posting, I arrange that an individual using a decent newsreader will only see my post once, even if he habitually reads all three news groups. I look forward to your response Mr. Vuori. -- David Arnstein |
#8
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"David Arnstein" wrote in message ...
In article , Matti Vuori wrote: Could you please post in one group only... I love usenet and I endeavor to be a "good citizen" in this space. I am very interested in your post. Would you please explain your reasoning. Here is mine: 1. My post is relevant to all three news groups. 2. By cross-posting, I arrange that an individual using a decent newsreader will only see my post once, even if he habitually reads all three news groups. I look forward to your response Mr. Vuori. I think Matti's post equates to, "I'm not using a decent news reader and don't know how Usenet works." |
#9
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David Arnstein wrote:
In article , Matti Vuori wrote: Could you please post in one group only... I love usenet and I endeavor to be a "good citizen" in this space. I am very interested in your post. Would you please explain your reasoning. Here is mine: 1. My post is relevant to all three news groups. 2. By cross-posting, I arrange that an individual using a decent newsreader will only see my post once, even if he habitually reads all three news groups. I look forward to your response Mr. Vuori. Following that line of reasoning, isn't your post relevant in rec.photo.digital.zlr as well? But your reasoning is flawed. If something is of general interest, it should only be in rec.photo.digital. The aim of splitting the newsgroups was to reduce the number of postings, and help people focus on their own interest better. There was no intention to replace the rec.photo.digital group. It would be better to restrict your posting to just one group if possible. Thanks, David |
#10
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David Arnstein wrote:
The digital cameras that I have seen have a feature that allows the user to choose an ISO setting. I would like to know what this feature does, since I suspect that it is useless. My concern is that setting a high ISO number simply 1. Causes the camera to take pictures that are quite dark 2. Post processes the picture by increasing the brightness, in software. If this is the case, then I prefer to increase the brightness myself, in Photoshop. On the other hand, if the ISO adjustment on the camera actually changes the physical properties of the photosensor, then it's a different story. I'd like some feedback on this before I spend my time experimenting with different ISO settings. Vastly oversimplified: The ISO number is like an amplifier volume setting. The larger the number the 'louder' the light output from the sensor. And, like a sound amplifier, excessive settings often produce very distorted, and 'clipped' output. The lower the ISO setting, the more light you need for a usable picture, but the higher the setting, the more the output from the sensor is amplified, and the more 'noise', and 'distortion' you will see. Many cameras use software to improve the image quality, and, since they have access to the original output from the sensor, they can usually do this better than Photoshop. -- Ron Hunter |
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