A reminder for some memebers as to what the F stop is all about.

Started Jan 26, 2014 | Discussions thread
pris Senior Member • Posts: 2,191
Sergei, a question...
2

gsergei wrote:

Given the same light source conditions and ISO setting the illumination, measured in lumens, received by any size of sensor is equal across all formats (no Ifs , no buts) , when cameras are set to the same A , S, ISO values. So, in practical terms this means, that the illumination received by my tiny c7070 at 125/5.6 and ISO 100 is exactly the same as on the so called FF sensor camera set to the same values. This will result in the same picture brightness/darkness , subject to DR and noise differences.

Yes but will all that still hold true when you try to make the image of the same perspective, frame and DOF? All the cross-format comparisons make sense only while you compare the same resulting image; as soon as you make different images, you have no basis for comparison. Think of what you are going to have to do to obtain the same DOF and whether your words above still hold.

get hold of ANY light meter (be it a 40 year old analogue one, or a modern Sekonic) and look at it carefully and then tell me , where do you see "Canon FF" or "Olympus c2020" or Fujifilm X100s ???

No, but your light meter only cares about light falling on the scene. It makes no judgement about framing, perspective and DOF you want to obtain - and that's exactly where the difference between "Canon FF" or "Olympus c2020" or Fujifilm X100s" kicks in.

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