Jan67

Joined on Jul 2, 2011

Comments

Total: 2, showing: 1 – 2
On article Choosing a camera Part 2: is a bigger sensor better? (416 comments in total)
In reply to:

Jan67: Richard Butler, I am afraid that your following statement:

"Two cameras with the same exposure receive the same light per square mm, and larger sensors have more square mm."

needs circumstances to be defined, like Angle of field and Depth of field. And these two should be the same. Otherwise, it is hard to make any conclusion because both pictures are different. If you take for example 200mm/f=4 on FF and 16mm/f=4 on APSC then they don't receive the same amount of light per square mm, even if exposure time is the same.

You discover then, that from two different sizes of sensor, with identical AoF and DoF (=identical amount of light) the larger one has lower intensity of light per square mm.

Since DoF has an influence on the light intensity (via entrance pupil), it would be correct to mention it. I would be completely fine with the statement:

"Two cameras with the same exposure (i.e., same field of view, f-number and shutter speed) but different depth of field, receive the same light per square mm, and larger sensors have more square mm."

Otherwise such statement could be understood in a wrong way.

Link | Posted on Apr 19, 2019 at 11:57 UTC
On article Choosing a camera Part 2: is a bigger sensor better? (416 comments in total)

Richard Butler, I am afraid that your following statement:

"Two cameras with the same exposure receive the same light per square mm, and larger sensors have more square mm."

needs circumstances to be defined, like Angle of field and Depth of field. And these two should be the same. Otherwise, it is hard to make any conclusion because both pictures are different. If you take for example 200mm/f=4 on FF and 16mm/f=4 on APSC then they don't receive the same amount of light per square mm, even if exposure time is the same.

You discover then, that from two different sizes of sensor, with identical AoF and DoF (=identical amount of light) the larger one has lower intensity of light per square mm.

Link | Posted on Apr 18, 2019 at 21:40 UTC as 8th comment | 2 replies
Total: 2, showing: 1 – 2