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

Started 5 months ago | Discussions thread
Steen Bay
Veteran MemberPosts: 6,188
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Re: DXO : t-stop is the effective way of measuring aperture.
In reply to MT, 5 months ago

MT wrote:

A bit OT, but with all of the talk of T-stop, I wonder how the Oly 12-40 f2.8 lens is wide open at 12mm. I just got it and it feels brighter than f2.8 whenever I shoot with it. Not sure why . But it has a lot of surfaces so I expect the T-stop to be lower than f2.8 considerably but it actually feels brighter than f2.8 for some reason.

MTMT

According to DxO the t-stop is 3.2 on GH2, 3.3 on E-M1 and 3.4 on E-M5.

http://www.dxomark.com/Lenses/Olympus/Olympus-MZUIKO-DIGITAL-ED-12-40mm-F28-PRO

(see measurements/transmission)

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