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Author Topic: Minor Panasonic 20mm mystery  (Read 228 times)

Offline Centauri27

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Minor Panasonic 20mm mystery
« on: July 30, 2010, 12:02:50 PM »
In playing around with my Panasonic 20mm, I noticed something slightly odd: in A and M modes, I can select f/1.7, but in any of the auto modes, the E-P1 "only" goes down to f/1.8. Has anyone else experienced this? Is it a firmware thing?
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Online voyager

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Re: Minor Panasonic 20mm mystery
« Reply #1 on: July 30, 2010, 03:37:37 PM »
I think that's because the auto mode only detects one third increments of the ISO. I don't know if they ever updated the firmware for that. Also, Olympus doesn't have a Micro Four Thirds lens that goes below f/2.8.
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Offline Olof in Amsterdam

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Re: Minor Panasonic 20mm mystery
« Reply #2 on: July 30, 2010, 03:53:14 PM »
Mine does go down to 1.7 when I point the E-P1 at a dark spot in my living room at night.
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Offline Centauri27

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Re: Minor Panasonic 20mm mystery
« Reply #3 on: August 03, 2010, 03:38:53 PM »
Yes, you're right Olof. When I point it at a darker area in my room, the aperture drops from f/1.8 to f/1.7. Rather odd algorithm. As voyager noted, it's probably because f/1.8 is the next 1/3 f-stop down from f/2.
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