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

Started 6 months ago | Discussions thread
Pixnat2
Veteran MemberPosts: 3,198Gear list
Like?
Re: DXO : t-stop is the effective way of measuring aperture.
In reply to Steen Bay, 6 months ago

Steen Bay wrote:

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)

Yes, in that department, the Lumix 12-35 is better with a t-stop of 3 on the GH2 and 3.1 of the E-M1 and 3.2 on the E-M5.

It's very intersting to note the difference between cameras. How lens can loose 0.2 t-stop between cameras?

I wonder if it's related to ISO sensitivity?

http://www.dxomark.com/Cameras/Compare/Side-by-side/Olympus-OM-D-E-M1-versus-Olympus-OM-D-E-M5-versus-Panasonic-Lumix-DMC-GH2___909_793_677#tabs-2

It show well that in the digital photography, the couple sensor-lens is more important than the lens or sensor taken individually.

-- hide signature --
 Pixnat2's gear list:Pixnat2's gear list
Panasonic Lumix DMC-GH2 Canon EOS M Nikon D600 Olympus E-M1
Reply   Reply with quote   Complain
Post (hide subjects)Posted by
NopeNew
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow