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Base ISO vs. Boosted ISO
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May 25, 2015 09:54:30   #
The Villages Loc: The Villages, Florida
 
Most DSLRs have a stardard ISO range (say) 100-1600, which can often be extended/boosted by going to H1 or equivalent. Maybe increasing the range to 3200 or 6400, etc.

Some have a range of (say) 100 to 12,500, whcih can be boosted even further.

Question - is the effect on the picture generated any different when making use of an ISO within the "base" range versus the boosted range?

It is understood that the higher the ISO goes the more noise is expected due to an increase in the digital frequency. But, all else being equal, is there a significant difference as to whether the ISO comes from the base range or the extended range?

Stated another way - Is there a differnce if I use (say) an ISO of 12,500 from the Base range, or 12,500 from the boosted range?

Thank you in advance for your input.

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May 25, 2015 09:59:28   #
jerryc41 Loc: Catskill Mts of NY
 
PCity wrote:
Stated another way - Is there a difference if I use (say) an ISO of 12,500 from the Base range, or 12,500 from the boosted range?

This wouldn't be on the same camera, right? If you're using two different cameras, a comparison would have other things changing the image quality.

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May 25, 2015 10:12:10   #
RRRoger Loc: Monterey Bay, California
 
What about the A7s?
It is supposed to have two base ISOs
100 and 3200

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May 25, 2015 10:15:41   #
Leitz Loc: Solms
 
PCity wrote:
Most DSLRs have a stardard ISO range (say) 100-1600, which can often be extended/boosted by going to H1 or equivalent. Maybe increasing the range to 3200 or 6400, etc.

Some have a range of (say) 100 to 12,500, whcih can be boosted even further.

Question - is the effect on the picture generated any different when making use of an ISO within the "base" range versus the boosted range?

It is understood that the higher the ISO goes the more noise is expected due to an increase in the digital frequency. But, all else being equal, is there a significant difference as to whether the ISO comes from the base range or the extended range?

Stated another way - Is there a differnce if I use (say) an ISO of 12,500 from the Base range, or 12,500 from the boosted range?

Thank you in advance for your input.
Most DSLRs have a stardard ISO range (say) 100-160... (show quote)


This is simple to test. Using your example, take a picture at ISO 12,500 set from the "base range." Now see if you can set ISO 12,500 from any other range. If so, take a picture at that setting, and compare the two.

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May 25, 2015 10:17:50   #
The Villages Loc: The Villages, Florida
 
jerryc41 wrote:
This wouldn't be on the same camera, right? If you're using two different cameras, a comparison would have other things changing the image quality.


Jerry - Don't know that the camera matters in my question. What I'm trying to get at is - is there any signifcant differnce in the general use of ISO as to whether the ISO number is within the base range or boosted range. Why not just have a base range that goes to the highest number versus breaking it down between base and boosted?

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May 25, 2015 10:21:48   #
Mac Loc: Pittsburgh, Philadelphia now Hernando Co. Fl.
 
PCity wrote:
Most DSLRs have a stardard ISO range (say) 100-1600, which can often be extended/boosted by going to H1 or equivalent. Maybe increasing the range to 3200 or 6400, etc.

Some have a range of (say) 100 to 12,500, whcih can be boosted even further.

Question - is the effect on the picture generated any different when making use of an ISO within the "base" range versus the boosted range?

It is understood that the higher the ISO goes the more noise is expected due to an increase in the digital frequency. But, all else being equal, is there a significant difference as to whether the ISO comes from the base range or the extended range?

Stated another way - Is there a differnce if I use (say) an ISO of 12,500 from the Base range, or 12,500 from the boosted range?

Thank you in advance for your input.
Most DSLRs have a stardard ISO range (say) 100-160... (show quote)


Higher ISOs produce grain (noise). Different cameras (sensors) are better at high ISOs than others. Generally sensors with lower MP counts are better at higher ISOs.

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May 25, 2015 10:22:47   #
jerryc41 Loc: Catskill Mts of NY
 
PCity wrote:
Jerry - Don't know that the camera matters in my question. What I'm trying to get at is - is there any signifcant differnce in the general use of ISO as to whether the ISO number is within the base range or boosted range. Why not just have a base range that goes to the highest number versus breaking it down between base and boosted?

I get the idea, but I didn't think it was possible to shoot at native 12,500 and boosted 12,500 on the same camera. My Nikons go up to a certain point, and then they have H1 and H2.

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May 25, 2015 10:38:00   #
The Villages Loc: The Villages, Florida
 
jerryc41 wrote:
I get the idea, but I didn't think it was possible to shoot at native 12,500 and boosted 12,500. My Nikons go up to a certain point, and then they have H1 and H2.


Jerry - I'm a Nikon guy also.

Is it just a Marketing thing. If the camera has a total range of (say) 100 to 12,800 why break it down to (say) 100 to 3200 and then a boosted range that goes to H1 6400 and H2 12,800. To my mind there must be some type of difference, otherwise why go to the trouble of dividing the range.

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May 25, 2015 10:55:19   #
bruswen Loc: Eugene OR
 
PCity wrote:
Most DSLRs have a stardard ISO range (say) 100-1600, which can often be extended/boosted by going to H1 or equivalent. Maybe increasing the range to 3200 or 6400, etc.

Some have a range of (say) 100 to 12,500, whcih can be boosted even further.

Question - is the effect on the picture generated any different when making use of an ISO within the "base" range versus the boosted range?

It is understood that the higher the ISO goes the more noise is expected due to an increase in the digital frequency. But, all else being equal, is there a significant difference as to whether the ISO comes from the base range or the extended range?

Stated another way - Is there a differnce if I use (say) an ISO of 12,500 from the Base range, or 12,500 from the boosted range?

Thank you in advance for your input.
Most DSLRs have a stardard ISO range (say) 100-160... (show quote)


ISO ratings vary from camera to camera depending on the sensor and processor involved. My understanding is that the signal from the sensor is amplified to raise the ISO and when they have reached the amplification limit (my guess is a minimum signal to noise ratio) that is the maximum ISO for that particular camera. For the H1 and H2 type settings, they are boosting the maximum ISO rating by one or two stops but no longer trying to maintain the signal to noise ratio they used for the ISO ratings. So the answer would be the image taken at a base range ISO 12800 would have less noise than an image from a boosted range ISO 12800 though they would have approximately the same sensitivity to light. There would still be a tremendous amount of variance between camera models with newer models generally performing better, for instance, ISO 6400 on my D7200 is much cleaner than ISO 6400 on the D7000 it replaced.

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May 25, 2015 11:01:25   #
oldtigger Loc: Roanoke Virginia-USA
 
PCity wrote:
...Is it just a Marketing thing. If the camera has a total range of (say) 100 to 12,800 why break it down to (say) 100 to 3200 and then a boosted range that goes to H1 6400 and H2 12,800. ....


if you have an iso range and the top 2 values give noisy results then you have a lousy camera
but
if you have an iso range with two additional levels of reduced quality for emergency use then you have a camera with extra features.
its just marketing.

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May 25, 2015 11:07:15   #
jethro779 Loc: Tucson, AZ
 
bruswen wrote:
ISO ratings vary from camera to camera depending on the sensor and processor involved. My understanding is that the signal from the sensor is amplified to raise the ISO and when they have reached the amplification limit (my guess is a minimum signal to noise ratio) that is the maximum ISO for that particular camera. For the H1 and H2 type settings, they are boosting the maximum ISO rating by one or two stops but no longer trying to maintain the signal to noise ratio they used for the ISO ratings. So the answer would be the image taken at a base range ISO 12800 would have less noise than an image from a boosted range ISO 12800 though they would have approximately the same sensitivity to light. There would still be a tremendous amount of variance between camera models with newer models generally performing better, for instance, ISO 6400 on my D7200 is much cleaner than ISO 6400 on the D7000 it replaced.
ISO ratings vary from camera to camera depending o... (show quote)


Doesn't the fact the D7200 is cleaner have to do with more megapixels than less megapixels.

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May 25, 2015 11:09:03   #
jethro779 Loc: Tucson, AZ
 
Mac wrote:
Higher ISOs produce grain (noise). Different cameras (sensors) are better at high ISOs than others. Generally sensors with lower MP counts are better at higher ISOs.


Doesn't your DF take better pictures than a D90?

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May 25, 2015 11:14:02   #
The Villages Loc: The Villages, Florida
 
bruswen wrote:
ISO ratings vary from camera to camera depending on the sensor and processor involved. My understanding is that the signal from the sensor is amplified to raise the ISO and when they have reached the amplification limit (my guess is a minimum signal to noise ratio) that is the maximum ISO for that particular camera. For the H1 and H2 type settings, they are boosting the maximum ISO rating by one or two stops but no longer trying to maintain the signal to noise ratio they used for the ISO ratings. So the answer would be the image taken at a base range ISO 12800 would have less noise than an image from a boosted range ISO 12800 though they would have approximately the same sensitivity to light.There would still be a tremendous amount of variance between camera models with newer models generally performing better, for instance, ISO 6400 on my D7200 is much cleaner than ISO 6400 on the D7000 it replaced.
ISO ratings vary from camera to camera depending o... (show quote)


Thanks for the response. I think that is what I was looking for. Seems to make sense.

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May 25, 2015 11:25:34   #
bruswen Loc: Eugene OR
 
jethro779 wrote:
Doesn't the fact the D7200 is cleaner have to do with more megapixels than less megapixels.


Actually more megapixels means smaller pixels which means lower signal all other things being equal. I think the cleaner image is from the expeed 4 processor though I am sure they have made some improvements in sensor technology as well.

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May 25, 2015 11:33:03   #
Mac Loc: Pittsburgh, Philadelphia now Hernando Co. Fl.
 
jethro779 wrote:
Doesn't your DF take better pictures than a D90?


I think I take better picture now, than I did when I was first starting with digital.

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