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

Started 10 months ago | Discussions thread
Tiger1
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Re: As a photographer ..
In reply to Sergey_Green, 10 months ago

Sergey_Green wrote:

Tiger1 wrote:

Now why do you think that anyone would care about the aperture diameter? The aperture diameter is only relevant when it is coupled to the focal length because as a photographer I actually measure light intensity (or luminosity) when I use a light meter. It actually gives me an F stop and a shutter speed. It does not give me an aperture diameter and then asks me for a focal length or vice versa. So f/2 IS f/2 when it comes to taking photos! Isn't that what this whole website is about? It is not about people like you getting so pedantic as to confuse everybody about what really is important.

The aperture diameter only explains why, but of course no-one should care what the exact size is. However, as a photographer, were you to shoot with different formats, would you care what your pics would look like at the end. After all, f/2 from FT and f/2 from FF are hardly the same. Would that matter?

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- sergey

F/2 is F/2 no matter what the format when it comes to exposure - that is what I'm talking about.

As a photographer I am interested in getting the correct exposure.

ISO, shutter speed and F stop determine exposure.

When it comes to DOF that is another matter.  The effect of F stop on DOF will depend on the focal length of the lens.  Because different formats have different angles of view, one has to change focal lengths to get the same perspective for each format.

Changing the focal length at a given aperture will then affect DOF.  To get equal DOF one has to increase ones aperture as the format gets smaller to retain the same perspective.

The F stop will still determine the exposure with the shutter speed for a given ISO.

So when it comes to EXPOSURE f/2=f/2=f/2 no matter what the format.

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