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<blockquote data-quote="WayneF" data-source="post: 491591" data-attributes="member: 12496">I think you said it quite well.&nbsp; There are many possible combinations of shutter speed and aperture that will all give the same &quot;equivalent&quot; exposure.&nbsp; But there is more, since each choice is a tradeoff, with repercussions, and as you say, often one factor is more important than the other (this time).&nbsp;&nbsp; One factor might help, like faster shutter speed can help capture motion. But the necessary wider aperture can limit depth of field, which may or may not matter more (for this specific scene in front of us).&nbsp;&nbsp; Or higher ISO might help both, up to a point.Either a slow shutter or high ISO, or a wide open lens can help dim scenes, but each can have bad effects.&nbsp; So we have to consider, for this scene in front of us now, which might help more than the other one could hurt?&nbsp; Which factor is most important for our consideration?&nbsp;&nbsp; We probably decide differently in a dim room, or out in the bright sun.In a pretty short time, this choice will be easily based on a little experience, knowing what we can expect from high ISO, or from a slow shutter speed, or from a wide aperture, etc.A pretty good book to help beginners get the proper ideas is Peterson's Understanding Exposure.&nbsp; Not expensive at Amazon, and it is in the public libraries here.&nbsp; Not deep, it is a quick simple pleasant read about these choices.</blockquote>

[QUOTE="WayneF, post: 491591, member: 12496"] I think you said it quite well. There are many possible combinations of shutter speed and aperture that will all give the same "equivalent" exposure. But there is more, since each choice is a tradeoff, with repercussions, and as you say, often one factor is more important than the other (this time). One factor might help, like faster shutter speed can help capture motion. But the necessary wider aperture can limit depth of field, which may or may not matter more (for this specific scene in front of us). Or higher ISO might help both, up to a point. Either a slow shutter or high ISO, or a wide open lens can help dim scenes, but each can have bad effects. So we have to consider, for this scene in front of us now, which might help more than the other one could hurt? Which factor is most important for our consideration? We probably decide differently in a dim room, or out in the bright sun. In a pretty short time, this choice will be easily based on a little experience, knowing what we can expect from high ISO, or from a slow shutter speed, or from a wide aperture, etc. A pretty good book to help beginners get the proper ideas is Peterson's Understanding Exposure. Not expensive at Amazon, and it is in the public libraries here. Not deep, it is a quick simple pleasant read about these choices. [/QUOTE]

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