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

Started 8 months ago | Discussions thread
tt321
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Re: *Realistic Expectation*, slight 0.3ev T-Stop lost it to be expected
In reply to 007peter, 8 months ago

007peter wrote:

I share the same thought as you (for the most part). However, you must keep your Expectation Realistic & Reasonable. A slight 0.3ev lost in T-Stop is to be expected. AFAIK, no lens live up to their T-Stop claim (or very very few do). Most manufacture measure them under the best LAB CONDITION, so in everyday "Real World", a slight 0.3ev lost isn't outrageous.

For example, the DXO Tested T Stops are:

  • 2.0 T-Stop for Panasonic 20mm F1.7 (II) | -0.3ev
  • 2.1 T-Stop for Panasonic 20mm F1.7 (I) | -0.4ev
  • 2.2 T-Stop for Olympus 12mm F2 | -0.2ev
  • 2.0 T-Stop for Olympus 45mm F1.8 | -0.2ev
  • 2.0 T-Stop for Olympus 75mm F1.8 | -0.2ev

Based on DXO results, I would say Olympus is more consistent with narrower gap between Lab Tested "claimed" vs real-world tested results. It would surprise me if the new Olympus 25/1.8 is tested exactly at 2.0 T-Stop.

Either way, I wouldn't worry about it. Since Olympus is the cheaper of the two, I just buy it over Panasonic.

You are right.

I looked at a number of FF 50/1.4 lenses (Canon, two versions of Nikkors, and a Sony) and they are all T1.6 so the PL25 is a bit worse in class, but not too radically different.

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