My bad -- I stand corrected!
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--joe
http://www.josephjamesphotography.com
http://www.pbase.com/joemama/
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ISO Speed Question
- Thread starter SDPPM
- Start date
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--joe
http://www.josephjamesphotography.com
http://www.pbase.com/joemama/
I stand corrected! Apologies for being stupid! : )
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--joe
http://www.josephjamesphotography.com
http://www.pbase.com/joemama/
thien nguyen
Senior Member
Lets assume that you are shooting in M mode, if you
have to shoot at certain minimum speed, would
you rather sacrifice DOF over high ISO ? what would
come into your mind first ?
These days, cameras are so good at high ISO that the
choice is easy.
--
Thien
have to shoot at certain minimum speed, would
you rather sacrifice DOF over high ISO ? what would
come into your mind first ?
These days, cameras are so good at high ISO that the
choice is easy.
--
Thien
--
thien nguyen
Senior Member
Lets assume that you are shooting in M mode, if you
have to shoot at certain minimum speed, would
you rather sacrifice DOF over high ISO ? what would
come into your mind first ?
These days, cameras are so good at high ISO that the
choice is easy.
To me, the aperture affects how I interpret what I see
in front of me. Changing the ISO makes little or no
difference.
--
Thien
have to shoot at certain minimum speed, would
you rather sacrifice DOF over high ISO ? what would
come into your mind first ?
These days, cameras are so good at high ISO that the
choice is easy.
To me, the aperture affects how I interpret what I see
in front of me. Changing the ISO makes little or no
difference.
--
Thien
--
NWcityguy2
Leading Member
I guess it all depends on what I want to do with the picture. If it is just for the web than any of the Iso's will do (of course I will use the lowest one that will work). If I want to print the picture than I'll try to stay at or below 400. If I want to make a big print I'll bring my tripod and leave it at 100.
--
Yawn...
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Yawn...
M mode, using flash indoor lowlight.
I increase the ISO from 100 to 400 to get better battery performance
shutter speed may not come to the picture at all in flash photography.
I increase the ISO from 100 to 400 to get better battery performance
shutter speed may not come to the picture at all in flash photography.
thien nguyen
Senior Member
So, if ISO 3200 is as good as ISO 100, will you have no hesitation
changing the ISO before thinking about changing the aperture ?
(apology for the repeated posts above, something is not working
well with dpreview web pages since the recent upgrade).
--
Thien
changing the ISO before thinking about changing the aperture ?
(apology for the repeated posts above, something is not working
well with dpreview web pages since the recent upgrade).
--
Thien
--I guess it all depends on what I want to do with the picture. If it
is just for the web than any of the Iso's will do (of course I will
use the lowest one that will work). If I want to print the picture
than I'll try to stay at or below 400. If I want to make a big print
I'll bring my tripod and leave it at 100.
--
Yawn...
NWcityguy2
Leading Member
For such a general question I can really only give a general answer, it all depends on the picture I am trying to take.
--
Yawn...
Chris59
Forum Pro
Goodness me, such heat generated over such a simple subject! I think you nailed it yourself when you asked about the trade off. In essence, it is up to you, it depends on what you are photographing and it depends on what "effect" you are trying to achieve.
I am not going to talk about when "I" change the ISO I shoot at because it isn't relevant. Instead, I want you to think about some scenarios.
If you are shooting some fast moving sports action and you want to freeze the action, you would use as wide an aperture as you can and as high an ISO as you can. If the light levels allow, you might want to reduce the ISO to improve noise while keeping the shutter speed high.
If you are shooting a waterfall and want to have a specific shutter speed, say one eighth of a second, in mind to give a certain "look" to the water, have a tripod and want good depth of field, then a low ISO is called for and will usually give you better dynamic range and less noise also.
Lets say you are shooting a landscape with some foreground detail you want to keep blurred and are shooting hand held. Common sense may dictate a certain f stop to keep depth of field narrow (for blurring the foreground) and a certain minimum shutter speed (depending on focal length and steadiness of your hands) to prevent motion blur. If that is so, then your only FLEXIBLE parameter is the ISO and you would choose the value to suit. Taking this hypothetical situation further, if light levels happened to fall during the shoot, you would compensate by increasing the ISO. If low noise, and good dynamic range and a good depth of field were paramount, then you would choose a low ISO, a high f stop number and a tripod!
In other words, you have three PARAMETERS for exposure to choose from - shutter speed, f stop and ISO. CHOOSE the important PARAMETER or PARAMETERS to give your photograph the "look" you WANT, and then select the other one or two parameters to give you the EXPOSURE you need. In short, in this example, choose the shutter speed and/or f stop you need for the shot and choose the ISO to suit, bearing in mind that the lower the ISO, the better the image quality.
I hope this helps.
I am not going to talk about when "I" change the ISO I shoot at because it isn't relevant. Instead, I want you to think about some scenarios.
If you are shooting some fast moving sports action and you want to freeze the action, you would use as wide an aperture as you can and as high an ISO as you can. If the light levels allow, you might want to reduce the ISO to improve noise while keeping the shutter speed high.
If you are shooting a waterfall and want to have a specific shutter speed, say one eighth of a second, in mind to give a certain "look" to the water, have a tripod and want good depth of field, then a low ISO is called for and will usually give you better dynamic range and less noise also.
Lets say you are shooting a landscape with some foreground detail you want to keep blurred and are shooting hand held. Common sense may dictate a certain f stop to keep depth of field narrow (for blurring the foreground) and a certain minimum shutter speed (depending on focal length and steadiness of your hands) to prevent motion blur. If that is so, then your only FLEXIBLE parameter is the ISO and you would choose the value to suit. Taking this hypothetical situation further, if light levels happened to fall during the shoot, you would compensate by increasing the ISO. If low noise, and good dynamic range and a good depth of field were paramount, then you would choose a low ISO, a high f stop number and a tripod!
In other words, you have three PARAMETERS for exposure to choose from - shutter speed, f stop and ISO. CHOOSE the important PARAMETER or PARAMETERS to give your photograph the "look" you WANT, and then select the other one or two parameters to give you the EXPOSURE you need. In short, in this example, choose the shutter speed and/or f stop you need for the shot and choose the ISO to suit, bearing in mind that the lower the ISO, the better the image quality.
I hope this helps.
If F/1.8 is as good as F/8, I would have no issues whatsoever. The fact is that whether we talk ISO, shutter speed or F stop, they have a considerable effect on the image. Depending on what you are looking for in your picture, the choices are to be made. There is no general answer, and if the question is about 5 stops, perhaps there is no answer at all
--
PicPocket
http://pictures.ashish-pragya.com/GalleryIndex.html
thien nguyen
Senior Member
This doesn't make sense to me. A photo taken at f1.8 can be
completely different to a photo taken at f8. It can alter
the intended mood, the story you are trying to tell.
If you are treating the aperture as "just 1 of 3 parameters",
that you can manipulate then think again.
--
Thien
completely different to a photo taken at f8. It can alter
the intended mood, the story you are trying to tell.
If you are treating the aperture as "just 1 of 3 parameters",
that you can manipulate then think again.
--
Thien
--
Chris59
Forum Pro
What I said was that there are three parameters that determine exposure. Some will be important to the look of the image, some will not. How you get the exposure necessary given the light on the scene WILL depend on the "look" you are trying to achieve. Given the same light levels, you would use a different combination of values for each parameter for different images.
For example, macro with tripod will require small aperture and low ISO - use whatever shutter speed will give the correct exposure. For fast moving sports - choose the highest shutter speed and whatever aperture and ISO will give the correct exsposure and depth of field. For portraits, a fairly wide aperture, a fast enough shutter speed to prevent motion blur (from the photographer) - and whatever ISO will give you the correct exposure.
I don't believe we are disagreeing here.
For example, macro with tripod will require small aperture and low ISO - use whatever shutter speed will give the correct exposure. For fast moving sports - choose the highest shutter speed and whatever aperture and ISO will give the correct exsposure and depth of field. For portraits, a fairly wide aperture, a fast enough shutter speed to prevent motion blur (from the photographer) - and whatever ISO will give you the correct exposure.
I don't believe we are disagreeing here.
Thats exactly what I meant. It alters the photo. Thats why I put it as "If f/1.8 is as good as f/8". Is it? NO. Did I claim it is? NO
If you think its not one of the parameters, think yet again. If you think that ISO 100 image has the same mood as ISO 3200 image, try taking a clean picture of something highly detailed. The fact is, you cannot manipulate any of the three if you are serious and also a perfectionist. You are forced to make compromises and in that case your compromise may not be same as mine. When I am light limited, I have to go for the least sacrifices that I can afford in areas of image that are more important to me. shutter speed to freeze subjects, aperture to get adequate depth of field and ISO for good detail/noise
--
PicPocket
http://pictures.ashish-pragya.com/GalleryIndex.html
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