Comparing Olympus 4/3lenses to FX "Full Frame" offerings

Started Jan 25, 2014 | Discussions thread
Tiger1 Contributing Member • Posts: 536
Re: remaining "ignorant"

Ian Stuart Forsyth wrote:

Tiger1 wrote:

Agree with the good doctor.

F1.8 = F1.8 on ANY format.

If you don't realise this you must go back to school and repeat first grade.

Depth of field changes with format because to get the equivalent view on a smaller format you must use a lesser focal length which automatically increases the depth of field.

Simple, really.

Let’s look at light as if it was paint coming from a spray can. The lens AP controls the intensity of the paint being applied to the surface of the sensor and they both receive the same duration. At the end of that time which sensor has received the most amount of paint ?

Sure they have the same thickness of paint applied to their surface but one has more paint applied to its total surface any guess which one?

Now what would it take for that smaller surface to receive the same total amount of paint if the duration was held the same. One could try and amplify the paint but that won’t work as we cannot create matter. Then I guess all that we can do is increase the intensity of the paint hitting the surface of the sensor by opening up the lens equal to the size ratio of the 2 sensors.

Well well well!!!  By your own admission the same thickness of paint is applied to each surface!!!

Isn't that the same as the intensity of light hitting per unit area?

If the same intensity is hitting the sensor then the photosites are getting the same amount of light!!!

Yes we know the photosites are smaller and thus collect less light per photosite. Nobody is disputing that fact and that is why a Nikon Df has much better noise characteristics than an Olympus EM-1.

What we are disputing is that when it comes to light gathering per unit area, F stops are the same no matter what the format.  As some has already said, if that wasn't the case hand held light meters would not work!

I've owned 8x10 cameras, medium format, 35mm, digital cameras of varied sensor size. When I use my light meter and it gives me a shutter speed and F stop it works for ALL those formats!!!!

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