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02-22-2008, 07:59 AM   #1
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K10D metering with FA 100/2.8 macro

Hi all.

Tried my K10D with the FA 100/2.8 macro tonight at a softball game and came out with some interesting metering problems with this particular combination. With the M 200/4 and DA 16-45, metering was just about right (perhaps slightly underexposed), but the FA 100/2.8 churned out overexposed image after overexposed image at EV 0.

Examples straight out of the camera:



Granted, the batter is reasonably well exposed, but I had the camera on multi-segment metering, AE-L not together with AF lock and even tried natural image mode to see if it would correct itself. No go - massive highlight clipping. Only when I turned EV down to -1.7 or -2.0 did exposure look right (from histogram). Anyone else experience this?

Oh, I should also say I've got the LL-60 viewfinder screen, the one that's divided in 3rds, which I'm wondering if it has an impact on metering...

02-22-2008, 08:19 AM   #2
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QuoteOriginally posted by Ash Quote
Hi all.

Tried my K10D with the FA 100/2.8 macro tonight at a softball game and came out with some interesting metering problems with this particular combination. With the M 200/4 and DA 16-45, metering was just about right (perhaps slightly underexposed), but the FA 100/2.8 churned out overexposed image after overexposed image at EV 0.
(images removed)

Granted, the batter is reasonably well exposed, but I had the camera on multi-segment metering, AE-L not together with AF lock and even tried natural image mode to see if it would correct itself. No go - massive highlight clipping. Only when I turned EV down to -1.7 or -2.0 did exposure look right (from histogram). Anyone else experience this?

Oh, I should also say I've got the LL-60 viewfinder screen, the one that's divided in 3rds, which I'm wondering if it has an impact on metering...
Haven't had that problem w/ my lens and a D. The screen MAY be a problem though. The discussion regarding the LL-60 vs 80 series and "modern" lenses is a bit open to debate.
The LL-60 is very helpful for M and other non-A lenses but there were some apparent problems w/ exposure and modern lenses (see Lance post's) but no "proper" and "repeated" tests were done.
If your aperature mechanism on the 100 isn't bad then the screen may be a problem....
Revert to the orig. screen and test.....in a pinch you could take it off "A" and treat it as a "M" lens. Advantage to having an aperture ring.
02-22-2008, 08:21 AM   #3
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What happens when you meter the FA 100 like the M 200? I.e. put the lens off the A position. Edit: this was already said above
02-22-2008, 08:31 AM   #4
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The difference between 1/30s & 1/40s is really small and slight variations like this in practice is not uncommon at all.

02-22-2008, 08:39 AM   #5
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I think the contrast ratio is beyond the capability of the sensors, and iuf you are metering multi segment, the black or dark backgrouns is influencing this too much.

you should be metering on Spot. or manually for the situation
02-22-2008, 03:42 PM   #6
Ash
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Points taken everyone. Thanks for the advice.
I will try Spot metering next time, then aperture ring and see if they make a difference.
Much appreciated guys.
02-25-2008, 01:20 PM   #7
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Can confirm, at least with my setup, that the LL-60 screen and FA 100/2.8 on A setting have a hard time metering. Once I took the lens off A, the camera metered fine. Spot metering alone did not fix the problem.

So far, I've needed to bump up EV by +0.3-0.7 with my DA 16-45 and Tammy 28-75, and they've come out with consistently good results.

Lucky I do have an aperture ring on the FA 100. I wonder if anyone has had this problem with their DFA 100/2.8?
02-25-2008, 01:48 PM   #8
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If you're having to compensate EV with all your lenses, the culprit could be your focusing screen that's affecting the meter reading. If you're not using the A setting (using your lens like a non-A lens), the K10D has a tendency to underexpose which is why your overall exposure might be ok.

02-25-2008, 08:33 PM   #9
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Try centre-weighted metering. Multi-segment just isn't accurate enough in my experience, and likely the batter is confusing it. Note the M 200 would have been running in centre-weighted mode anyways.
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