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

Started 10 months ago | Discussions thread
007peter
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*Realistic Expectation*, slight 0.3ev T-Stop lost it to be expected
In reply to Pixnat2, 10 months ago

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.

Pixnat2 wrote:

I'm interested on a 25mm for my E-M1. We have two native 25mm now : a f/1.4 and a f/1.8 lens.

But there's some questions about the fact the Panasonic 25mm is a real f/1.4 lens :

What do you think? Is it possible that the Panaleica is more a f/1.7 rather than a f/1.4 lens?

What are your thoughts about it

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