Forums
New posts
Search forums
What's new
New posts
New media
New media comments
New profile posts
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Nikon DSLR Cameras
D7100
EV values in display?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="jimalexander" data-source="post: 308379" data-attributes="member: 25235"><p>originally posted by WayneF</p><p></p><p>See the EV chart I guess.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>Doesn't the origin at f/1.0 at 1 second being numbered EV 0 sound extremely arbitrary? Convenient? What is it an exposure of? Even if you imagine it says ISO 100 (It doesn't mention ISO), what is it an exposure of? Rhetorical, but what is the theoretical origin of your notions of ISO 100? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p><em>no argument that the chart can be used at the same ISO to compare different combinations of aperture and shutter that would give the same quantity of light (exposure). merely meant to point out that it is also expandable to be able to compare different combinations of aperture and shutter at different ISO, therefor it is not entirely independant of ISO such that one cannot say that EV15 is the same exposure value so that "</em>we can run ISO from the least value to its highest value, and it remains EV 15, at any ISO ... at any resulting exposure." <em>EV15 at ISO 800 has 3 components; aperture, shutter and ISO stops all totaling 15 stops.</em></p><p><em></em><p style="text-align: left"><span style="color: #000000"></span></p> <p style="text-align: left"><span style="color: #000000"></span></p><p>You are close to the right idea with the concept of equivalent exposures. EV is in fact just a name for the set of shutter/aperture combinations which give an Equivalent Exposure. Not absolute, just relative. Not any one exposure, no ISO, just a name for the numerical set of equivalent shutter/aperture combinations. </p><p><em></em></p><p><em>Whether close or not, it is the system I learned in school that has worked with remarkable accuracy for 20 years.</em></p><p></p><p>If you increase shutter speed one stop, and open aperture one stop, that is still equivalent exposure<strong> at any ISO</strong>. If you only change one of them, that moves you to the next row. That's what the EV chart shows.</p><p><em></em></p><p><em>Agreed here. Only meant to point out that this two part relationship can easily be expanded to three parts, and that gives absolute exposure value.</em></p><p></p><p>OK, you can pretend to arbitrarily assign an ISO, and then make claims for your new concept regarding exposures, so long as you always explain about your ISO. But ISO is not in the chart.</p><p></p><p><em>Arbitrary? yes. 0 is just an arbitrarty starting point commonly used in science and engineering, you're dead on there. New concept? at least twenty years old and coming from a creditable source, and I imagine mine was not the first class to hear it. Here is a couple of charts giving the EV stops as well as the EV numbers in footcandles and lux, which are absolute measures of light.</em></p><p><em></em></p><p><em><a href="http://www.fredparker.com/ultexp1.htm" target="_blank">http://www.fredparker.com/ultexp1.htm</a></em></p><p><em></em></p><p><em> Not my intention to be rude here, not to anyone and not to WayneF, but it is what it is. EV is an absolute measurement of the quantity of light (lux), which makes it highly reliable for walking into a scene, knowing it is EV16 or whatever, and doing half a sec of numbercrunching and hitting manual settings (aperture, shutter speed and ISO) right from the starting gate.</em></p><p></p><p>Jim</p></blockquote><p></p>
[QUOTE="jimalexander, post: 308379, member: 25235"] originally posted by WayneF See the EV chart I guess.. :) Doesn't the origin at f/1.0 at 1 second being numbered EV 0 sound extremely arbitrary? Convenient? What is it an exposure of? Even if you imagine it says ISO 100 (It doesn't mention ISO), what is it an exposure of? Rhetorical, but what is the theoretical origin of your notions of ISO 100? :) [I]no argument that the chart can be used at the same ISO to compare different combinations of aperture and shutter that would give the same quantity of light (exposure). merely meant to point out that it is also expandable to be able to compare different combinations of aperture and shutter at different ISO, therefor it is not entirely independant of ISO such that one cannot say that EV15 is the same exposure value so that "[/I]we can run ISO from the least value to its highest value, and it remains EV 15, at any ISO ... at any resulting exposure." [I]EV15 at ISO 800 has 3 components; aperture, shutter and ISO stops all totaling 15 stops. [/I][LEFT][COLOR=#000000] [/COLOR][/LEFT] You are close to the right idea with the concept of equivalent exposures. EV is in fact just a name for the set of shutter/aperture combinations which give an Equivalent Exposure. Not absolute, just relative. Not any one exposure, no ISO, just a name for the numerical set of equivalent shutter/aperture combinations. [I] Whether close or not, it is the system I learned in school that has worked with remarkable accuracy for 20 years.[/I] If you increase shutter speed one stop, and open aperture one stop, that is still equivalent exposure[B] at any ISO[/B]. If you only change one of them, that moves you to the next row. That's what the EV chart shows. [I] Agreed here. Only meant to point out that this two part relationship can easily be expanded to three parts, and that gives absolute exposure value.[/I] OK, you can pretend to arbitrarily assign an ISO, and then make claims for your new concept regarding exposures, so long as you always explain about your ISO. But ISO is not in the chart. [I]Arbitrary? yes. 0 is just an arbitrarty starting point commonly used in science and engineering, you're dead on there. New concept? at least twenty years old and coming from a creditable source, and I imagine mine was not the first class to hear it. Here is a couple of charts giving the EV stops as well as the EV numbers in footcandles and lux, which are absolute measures of light. [URL]http://www.fredparker.com/ultexp1.htm[/URL] Not my intention to be rude here, not to anyone and not to WayneF, but it is what it is. EV is an absolute measurement of the quantity of light (lux), which makes it highly reliable for walking into a scene, knowing it is EV16 or whatever, and doing half a sec of numbercrunching and hitting manual settings (aperture, shutter speed and ISO) right from the starting gate.[/I] Jim [/QUOTE]
Verification
Post reply
Forums
Nikon DSLR Cameras
D7100
EV values in display?
Top