2) Open the generated PGM file with a image editor and visually determine the area of the masked pixels at the top and the left. For a given sensor it is the same for all the pictures (for the 6D2: 120 pixels at the left and 44 at the top).
I am really a newbie how to calculate the DR.
So, please answer a few questions I have:
1. Doesn't a scenary in motion like the ones in Rob's images disturb the calculations?
2. Why does 6d Mk2 has a mean of +0,7 eV more exposure than 6D across all ISO's. The biggest difference is in ISO100 which is more than +1 eV. (13s vs 30s). Doesn't this disturb the calcuations?
3. Won't the vignetting interfere?. The 16-35 at F4 has a vignetting of -2 -> -1,5 eV while EF 35/1.4 at F4 has only about -0,5 eV. Meaning the sensor will gather different amount of photons in the corners.
4. The 16-35 has a transmittans value for 4.5. The 35 has about T4 after stopping down. That Will give 6D a slight edge in photon count. But then again, Will the calculations cancel this out somehow?
5. The Tree on the hill when boosting the shadows. I'd noticed that the focus could be slighty off. Could this affect the details recovered on the tree? If its slightly off, there are no details, just noise? The trash on the beach on the left is more detailed on the 6D Mk2 while the tree is more detailed on 6D.
6, I also noticed a slight difference in WB even when doing it manually on the same spot on the scene. Could thie change interfere? The WB could be due usage of different lenses.
Jul 10, 2017 at 02:33 PM
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