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

Started 10 months ago | Discussions thread
Pixnat2
Veteran MemberPosts: 3,253Gear list
Like?
Agree.
In reply to 007peter, 10 months ago

007peter wrote:

Hi Peter, thanks for your answer

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

Yes, I've seen it. Panasonic primes seems to be consistently 0.3ev darker than the claims, while Olympus 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.

Robin Wong seems to think that it's actually brighter than its claims. It would be a good surprise if DXO confirms it (though I doubt it).

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

That's my thinking now, though I like the pictures I've seen with the Panasonic. I think I'll buy the Olympus, but I'm curious about the diffrences between both.

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