tag:blogger.com,1999:blog-91400761787418900222024-03-13T15:53:58.760-07:00Photography ExaminedRobinhttp://www.blogger.com/profile/05029280639713676924noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-9140076178741890022.post-29677346946699949902012-10-26T09:10:00.002-07:002012-10-26T09:10:25.299-07:00Nature Photograhy Expo in Manasas Nov 9-11 check it out<br />
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http://www.naturevisions.org<br />
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Robinhttp://www.blogger.com/profile/05029280639713676924noreply@blogger.com0tag:blogger.com,1999:blog-9140076178741890022.post-89391928837794616282012-10-20T15:40:00.003-07:002012-10-20T15:50:22.551-07:00<h2>
<span style="color: blue;">When will your camera's light meter get the exposure wrong! </span></h2>
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<span style="font-family: Arial,Helvetica,sans-serif;"><span style="font-weight: normal;"><span style="font-size: small;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent">The
photos below are an experiment to demonstrate how any in-camera light meter
(i.e., reflective light meter) can be fooled into under or over exposing
a scene <u>If</u> the objects being metered in the scene are not middle grey in tone. <br /> <br />
For this experiment I used an old Kodak 18% grey card, and 8 different
colored sheets of simple construction paper. The 8 colors were 1) white
2) light brown 3) blue 4) light green 5) orange 6) yellow 7) red 8)
black.<br /> <br /> The lighting was exactly the same in all of the shots,
and I used a Pentax spot meter to get the indicated exposure. (this spot
meter is highly accurate and measures the scene with a 1 degree
circle). Each colored square has the exposure written along the bottom
so you can see the exact exposure used. I kept the aperture constant at f
2.8 so only the shutter speed varies.<br /><div style="text-align: left;">
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The first square is the 18% grey card. The spot meter indicated an exposure of f2.8 at 1/80 of a second. </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgF71eidSYP4A_1leFJUCAg75XmorPpn1onEeeG79aEM_bp1RtLwnV0NzaztkVy2-IRm0VbbE5eom_mchCyXWHb7DyijefpOoX8MTziq6L1w5FrKVH-K4N26p3jwiRDsPNxbC7yQ-BM9JI/s1600/DSC02611.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="212" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgF71eidSYP4A_1leFJUCAg75XmorPpn1onEeeG79aEM_bp1RtLwnV0NzaztkVy2-IRm0VbbE5eom_mchCyXWHb7DyijefpOoX8MTziq6L1w5FrKVH-K4N26p3jwiRDsPNxbC7yQ-BM9JI/s320/DSC02611.jpg" width="320" /></a></div>
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The next 8 shots were all
taken at the same exposure - f 2.8 at 1/80 of a second (i.e., the
exposure indicated by taking a reading off the Kodak grey card). All the colors are accurate because we used the exposure obtained by metering off the grey card. Notice that the white sheet looks white and the black sheet looks black.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhAXqdR_UIC_LW5-AK-dvK12tVYHXJJEo4ejwxHX8WCbQjMXTmjffaG2rhS39AFcA5Pdl8uBD4gYyDA1qfjVAFwcZvjjTqdxdd2KqVJR-OqCWQQwpVBoauI6ADDkE_JofHLXH92t_Bcd2I/s1600/DSC02613.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="212" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhAXqdR_UIC_LW5-AK-dvK12tVYHXJJEo4ejwxHX8WCbQjMXTmjffaG2rhS39AFcA5Pdl8uBD4gYyDA1qfjVAFwcZvjjTqdxdd2KqVJR-OqCWQQwpVBoauI6ADDkE_JofHLXH92t_Bcd2I/s320/DSC02613.jpg" width="320" /></a></div>
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<span style="font-family: Arial,Helvetica,sans-serif;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent"></span></span></span><br />
<a name='more'></a><span style="font-family: Arial,Helvetica,sans-serif;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent"> </span></span><span class="messageBody" data-ft="{"type":3}"><span class="userContent"> </span></span></span><br />
<span style="font-family: Arial,Helvetica,sans-serif;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent">For
the 2nd group of shots, I took a reading with the spot meter <u>directly off each
colored sheet</u> <i>instead of using the grey card</i>. </span></span></span></div>
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<span style="font-family: Arial,Helvetica,sans-serif;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent">When you look at these
shots, you will see that the exposure <u>varies </u>from the "grey card"
reading of f 2.8 at 1/80 on ALL of the shots. </span></span></span></div>
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<span style="font-family: Arial,Helvetica,sans-serif;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent">The white sheet now looks grey. This is exactly what happens when you meter off a white wedding dress. It's now 2 1/3 stops underexposed and it middle grey in tone.</span></span></span></div>
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The brown and blue sheets are only 1/3 of a stop underexposed but you can clearly see that the colors are a bit darker when you compare them with the first set.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitV1pFjvgSSuYPajAlErYRDLOjruDuMGXjGjX_lKmbGH7peLu7ST73VcynPi_kbMC-IHKDPfI7cK-E6Zsm-1xgSIx1I_agYfZt1J4cFGBXA-HOCb3FIbl9zUepkCoPw8dd3odFLNbVahA/s1600/DSC02621.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="212" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitV1pFjvgSSuYPajAlErYRDLOjruDuMGXjGjX_lKmbGH7peLu7ST73VcynPi_kbMC-IHKDPfI7cK-E6Zsm-1xgSIx1I_agYfZt1J4cFGBXA-HOCb3FIbl9zUepkCoPw8dd3odFLNbVahA/s320/DSC02621.jpg" width="320" /></a></div>
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The color of the green sheet is 1 stop underexposed. The color has gone from a teal color to true green. <br />
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The orange sheet is 1 1/3 stop underexposed and now looks more rust colored. <br />
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The yellow sheet is 1 2/3 stops underexposed and the color has changed dramatically. <br />
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The red sheet is 2/3 of a stop underexposed and the color is a bit darker and richer.<br />
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Finally, the back sheet is 1 stop overexposed, and as expected, now looks grey.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8BBvoEqDRIIS9dzYBi9eQSMipMzN0mHwQnzcMY7SQ3fYZTJlwHHEjPloE-wfpLRRVq2afe_wTd5dF9RleS1O1P3mU6rDzzZj4RCuoviTGBoMuUOLlgptL6TI2NDcWwA-89IqZxiJHuHE/s1600/DSC02628.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="212" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8BBvoEqDRIIS9dzYBi9eQSMipMzN0mHwQnzcMY7SQ3fYZTJlwHHEjPloE-wfpLRRVq2afe_wTd5dF9RleS1O1P3mU6rDzzZj4RCuoviTGBoMuUOLlgptL6TI2NDcWwA-89IqZxiJHuHE/s320/DSC02628.jpg" width="320" /></a></div>
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<span style="font-family: Arial,Helvetica,sans-serif;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent">So when </span></span></span><span style="font-family: Arial,Helvetica,sans-serif;"><span style="font-weight: normal;"><span style="font-size: small;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent"><span style="font-family: Arial,Helvetica,sans-serif;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent">we metered directly off the colored sheets (instead of the grey card) why did we get the wrong exposure? </span></span></span></span></span></span></span></span></div>
</span></span></span></span></span></h5>
<span style="font-family: Arial,Helvetica,sans-serif;">Because each of these colors has a different reflectivity property from
the grey card. In fact, all of the colors reflect more light that the
grey card with the sole exception of the black colored sheet. That is
why all of the shots in the second group are underexposed, except for
the black sheet.</span><br />
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<span style="font-size: small;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent"></span></span><span style="font-family: Arial,Helvetica,sans-serif;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent">If an object
reflects more light (than middle grey), the meter will measure the
brightness (luminosity) as being greater than it really is. If the
meter sees the scene as brighter, it will select a faster exposure and
your shot will be underexposed. For example, if you meter off a white
wedding dress than you will be about 2 stops underexposed and the dress
will look grey in the final shot.</span></span></span></span></div>
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<span style="font-size: small;"><span style="font-family: Arial,Helvetica,sans-serif;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent">In this experiment, we found out that all of the colored sheets except of the black where more reflective than the grey card. Since they were more reflective, the meter's assumption that colored sheets had the same reflectivity as middle grey was wrong.</span></span></span></span></div>
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<span style="font-family: Arial,Helvetica,sans-serif;"><span style="font-size: small;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent">Here is a Table of the exposure differences that occur when you meter off each colored sheet:</span></span></span></span></h5>
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<span style="font-family: Arial,Helvetica,sans-serif;"><span style="font-size: small;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent"> White: - 2 1/3 stops<br /> Light brown: - 1/3 stop<br /> Blue: - 1/3 stop<br /> Light green: - 1 1/3 stop<br /> Orange: - 1 1/3 stop<br /> Yellow: - 1 2/3 stop<br /> Red: - 2/3 stop<br /> Black: + 1 stop</span></span></span></span></h5>
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<span style="font-family: Arial,Helvetica,sans-serif;"><span style="font-size: small;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent"><span style="font-weight: normal;">One of the challenges that often occurs, particularly in landscape photography, is to identify the middle grey tone on the scene that you are framing. We can see from this experiment that the light brown and blue sheets were close to middle grey in brightness, but this was far from obvious by just looking at the sheets.</span></span></span></span></span></h5>
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<span style="font-family: Arial,Helvetica,sans-serif;"><span style="font-size: small;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent"><span style="font-weight: normal;"> All of this leads into the discussion of the Ansel Adams Zone System. Stay tuned. </span></span></span></span></span></h5>
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<span style="font-family: Arial,Helvetica,sans-serif;"><span style="font-size: small;"><span class="messageBody" data-ft="{"type":3}"><span class="userContent"></span></span></span></span>Robinhttp://www.blogger.com/profile/05029280639713676924noreply@blogger.com1