Is the Panasonic 25mm a real f/1.4 lens?

Started 10 months ago | Discussions thread
Paul De Bra
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A general discussion of F versus T stop would indeed be interesting.
In reply to Pixnat2, 10 months ago

But of course the topic has come up several times already. There are still many people who think that the F stop really and truly corresponds to the amount of light a lens lets through whereas it is just about the dimension of the aperture. The F-stop also defines the maximum number the T-stop can be. But each lens element potentially absorbs some light so complex lenses will always have a T-stop that is measurably lower than their corresponding F-stop, perhaps more so with zoom lenses than with primes (although not "necessarily" so).

I can understand that it is confusing for consumers especially since the F-stop is published and the T-stop is not. People think that they will capture more light with an f/1.4 lens than with an f/1.8 lens but the definition of the F-stop does not imply that at all.

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Slowly learning to use the Olympus OM-D E-M5.
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