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Imaging Technology: Theory, Alternatives, Practice and Advances. This is a brand independent discussion of theory, process or device. Ignore this forum unless this matters to you!

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  #1  
Old August 10th, 2007, 10:25 PM
Doug Kerr Doug Kerr is offline
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Default Photographic Photometry - New tutorial article

Many of the technical issues we are interested in involve photometry, the discipline of describing the "strength" of light. Our discussions are often hampered by incomplete or inaccurate understanding of the different concepts of the "strength" of light and the terms, quantities and units that are involved.

This can lead us to hear, for example, "What fraction of the scene luminance does an f/2.0 lens pass through to the sensor?", which unfortunately has no meaning.

I have just posted to my technical information site, The Pumpkin, a new tutorial article, "Photographic Photometry 101", available here:

http://doug.kerr.home.att.net/pumpki...#Photometry101

It describes the different photometric quantities (luminance, illuminance, etc.) that are of importance in photographic technology and explains the differences between them and what situations they apply to. The article then briefly discusses, in terms of these quantities, what it is that a lens does (photometrically) and how do we describe what film or a digital sensor responds to.
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Old August 11th, 2007, 05:20 AM
Bart_van_der_Wolf Bart_van_der_Wolf is offline
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Quote:
Originally Posted by Doug_Kerr View Post
I have just posted to my technical information site, The Pumpkin, a new tutorial article, "Photographic Photometry 101", available here:

http://doug.kerr.home.att.net/pumpki...#Photometry101
Thanks Doug,

Your technical articles are recommended reading.

Bart
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  #3  
Old August 11th, 2007, 07:13 AM
Doug Kerr Doug Kerr is offline
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Hi, Bart,

Quote:
Originally Posted by Bart_van_der_Wolf View Post
Your technical articles are recommended reading.
Thank you so much.

Best regards,

Doug
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  #4  
Old August 11th, 2007, 07:18 AM
Cem_Usakligil Cem_Usakligil is offline
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I agree with Bart fully. Not only it is highly recommended reading, it is also an excellent source of information which is nowhere else explained so clearly and throughly.

Thanks a million Doug for doing all that hard work and sharing it with us, it is greatly appreciated :-).

Cheers,
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Kind Regards, Cem

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  #5  
Old August 11th, 2007, 07:39 AM
Doug Kerr Doug Kerr is offline
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Hi, Cem,

Quote:
Originally Posted by Cem Usakligil View Post
Thanks a million Doug for doing all that hard work and sharing it with us, it is greatly appreciated).
Thank you so much.

Best regards,

Doug
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