18% Grey Card. To use it or not.

[Milpool]

He once referred to it as moon over hernia if I remember correctly. No joke.

I can't tell you the number of times I've seen people write "Moonrise over Hernandez," and I always have the exact same thought as you--that is not what he titled the thing! I also continue to be amazed at how many times I see his last name written as "Adam's."

 

[DREW WILEY]

What difference does it make? If you have enough money to buy it, the gallery will figure out what you mean.

 

[Mike Lopez]

What difference does it make? If you have enough money to buy it, the gallery will figure out what you mean.

Thanks for the input, Andy.

 

[Alan Edward Klein]

If they were titled "Sunrise over Hernandez", I would have checked the provenance.

Even rarer.

 

[wiltw]

I've seen quite a few big Moonrise prints - after all, it was not only his most famous image, but by far, his most printed cash cow, over 350 of them.

No need for Photoshop. Michael Fatali simply sandwiched 8x10 chromes together for sake of optical Ciba enlargements, in one instance three of them, with both the rising moon and setting sun in astronomical impossible proximity. One should get suspicious of exactly the same crescent moon appearing in the same place in the sky in several different images. But the result was far more seamlessly precise, even in a 40X60 print, than anything digitally altered and printed.

Maybe I should revive the photo that I had AI create, of 'sunrise over San Francisco', AI showing the sun rising in the western sky?

 

[Chuck1]

Don't forget people so they can have odd hands and feet

 

[DREW WILEY]

When I bought and sold paint I made up a spoof color card with colors like Los Angeles Sunrise, dark brown.

When I comes to SF, I chuckle over the "blood moon" image arising above the Golden Gate Bridge well after sunrise, and about sixty times bigger in diameter than it would really appear. It was actually at its peak several hours earlier in a different position in the sky, while it was still dark. But that image got shown on the morning news, so it must have gotten all PS cobbled together awfully fast.

 

[Stephen Benskin]

This is from Jack Holm's paper Exposure Speed Relations and Tone Reproduction.

MI = Exposure Meter Index.
<Hg> = statistically average film plane mean exposure (lux-seconds)
H18% = film plane midtone exposure (lux-seconds)
<Lg> = statistically average scene mean luminance (candelas per square meter)
r = Lambertian (perfectly diffusing) surface reflectance
E = Scene illuminance (lux)

Holms uses 128% for highlight reflectance for the paper. Most sources use 100% reflectance. "These values result in the mean luminance correlating with a Lambertian scene reflectance of 12% for 100% highlight reflectance or 14% for 128% highlight reflectance." So his one third stop lighter than average would be 1/2 stop if 100% reflectance was used for the highlight making the calibration average luminance 12%.

Equation 10:

t = shutter speed
A = lens f/ number
K = exposure meter equation constant (luminance or reflected metering)
EI = Exposure meter Index

 

[Alan Edward Klein]

This is from Jack Holm's paper Exposure Speed Relations and Tone Reproduction.

MI = Exposure Meter Index.
<Hg> = statistically average film plane mean exposure (lux-seconds)
H18% = film plane midtone exposure (lux-seconds)
<Lg> = statistically average scene mean luminance (candelas per square meter)
r = Lambertian (perfectly diffusing) surface reflectance
E = Scene illuminance (lux)

View attachment 409299
Holms uses 128% for highlight reflectance for the paper. Most sources use 100% reflectance. "These values result in the mean luminance correlating with a Lambertian scene reflectance of 12% for 100% highlight reflectance or 14% for 128% highlight reflectance." So his one third stop lighter than average would be 1/2 stop if 100% reflectance was used for the highlight making the calibration average luminance 12%.

Equation 10:

t = shutter speed
A = lens f/ number
K = exposure meter equation constant (luminance or reflected metering)
EI = Exposure meter Index

View attachment 409300

View attachment 409307

What does this all mean and how would you use it? In simple language.

 

[Stephen Benskin]

What does this all mean and how would you use it? In simple language.

It's the explanation behind the use. Instead of just making a claim, I've included the proof. The diagram illustrates it. Conclusion, the exposure meter isn't calibrated to 18%, but you can use an 18% gray card to make an exposure.

 

[DREW WILEY]

Just how many commercial gray cards equate to a Lambertian surface anyway? Probably zero. That's why it's "Fuzzy Math".