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Forum: Pentax News and Rumors 01-25-2019, 04:28 AM  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By Fogel70
Replies: 887
Views: 72,589
They call it normalization because it is normalization. Normalization is done so you can compare data easily between different sensor sizes and pixel sizes.
Like the same normalization that happens when you print out different MP images on same sized paper.

Without normalization you get like on the screen score where only cameras with same number of MP can be directly compared.
Forum: Pentax News and Rumors 01-24-2019, 03:13 PM  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By Fogel70
Replies: 887
Views: 72,589
I would use whatever aperture that give the DOF I need, vignetting is easy to correct in post if needed, and I'm pretty sure DA70 give better corner performance than K105 on K1II.
Forum: Pentax News and Rumors 01-24-2019, 02:41 PM  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By Fogel70
Replies: 887
Views: 72,589
l would use K1ll with DA70.
Forum: Pentax News and Rumors 01-24-2019, 05:19 AM  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By Fogel70
Replies: 887
Views: 72,589
And as dxomark use a fixed number of pixels for the screen score a 15 year old APS-C camera like Nikon D2h will give similar result as from one of the latest FF cameras like Nikon D850. It is just that the same number of pixel on D2h use a 5x sized area of the sensor compared with D850 in this comparison.

So when using screen score to compare cameras with different number or different sized pixels, or even same sized pixels, it may be hard to understand what you see.
Forum: Pentax News and Rumors 01-23-2019, 11:32 PM  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By Fogel70
Replies: 887
Views: 72,589
No, it is you that still do not get dxomark, or understand the difference between exposure and captured images!

What you see above must be the screen score, which compare noise in a fixed number of pixels. The print score will show a much larger difference as it represents the noise difference in whole images.
Forum: Pentax News and Rumors 01-23-2019, 09:34 PM  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By Fogel70
Replies: 887
Views: 72,589
Are you saying you bought Q7, K30 and KP blindly, not knowing anything of the advantages they would bring before you bought them?

What disadvantage would equivalence have given you in these decisions? Equivalency is not a religion so it do not claim to give the answer to all the questions you might have, it is only an additional tool for helping on the relation between formats.

For me in this situation would have ment that would have to by K1 and a number of FF lenses to understand that FF would not bring enough adavantages over APS-C for me.
Forum: Pentax News and Rumors 01-23-2019, 09:00 PM  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By Fogel70
Replies: 887
Views: 72,589
And with the use of equivalence you can make a more educated decision on what format to choose. As it makes it easier to understand the relation between the existing options.

I'm not sure I understand the importance of not using equivalence?
Forum: Pentax News and Rumors 01-23-2019, 11:20 AM  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By Fogel70
Replies: 887
Views: 72,589
In case you do not suffer from obsessive-compulsive equivalence disorder, it will probably not be too difficult for you to stop discussing it.
Forum: Pentax News and Rumors 01-23-2019, 01:38 AM  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By Fogel70
Replies: 887
Views: 72,589
No, nothing in the post I quoted imply that by sensor it mean pixel. I know you want to use you own invented physics, but most of us prefer to keep to the physics defined by science.

But for exposure there is no difference between sensor and pixel as they both capture the same amount of "light per unit area" in the same exposure.
This is why it is important not to mix "amount of light" with "amount of light per unit area" because they mean two different things.

"amount of light" is the sum of the light captured. Which increase with the captured area.
"amount of light per unit area" is the average light within the captured area. Which only change with intensity of light.
Forum: Pentax News and Rumors 01-22-2019, 10:11 PM  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By Fogel70
Replies: 887
Views: 72,589
Light meters measure light intensity, which is "light per unit area".

The amount of light a sensors capture is light per unit area × area size. So at the same exposure a larger sensor captures more light. Which is why a larger sensor tend to give less noise in images at the same ISO as a smaller sensor.






QuoteQuote:

Read the ISO documents on light sensitive sensors. From Wikipedia:
"In photography, exposure is the amount of light per unit area (the image plane illuminance times the exposure time) reaching a photographic film or electronic image sensor, as determined by shutter speed, lens aperture and scene luminance. Exposure is measured in lux seconds, and can be computed from exposure value (EV) and scene luminance in a specified region."
emphasis mine.

Nowhere in the ISO documents does it mention the physical size of the sensor. A 135 format lens will be larger than a ASP-C lens with the same aperture range will be larger not because it inherently "gathers more light" but because the image circle is larger. When you get down to the "light per unit area" the amount of light, number of photons (or whatever you want to call it) will be identical when using a 135 format lens on a APS-C sensor.

If you have a smaller sensor, why would you fabricate a lens that projects the image over a larger area?

While a 135 lens does gather more photons in general, when placed on a APS-C camera body a lot of those photons never hit a sensor and are thus for all intents and purposes are ignored by the camera. Remember, exposure is determined at the surface of the sensor, not the size of the sensor or lens.



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