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01-13-2012, 12:42 PM   #46
fuf
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QuoteOriginally posted by Mark D Quote
Correctly exposing a Flash exposure at 2m using f2 may be asking a bit much. How does it behave if you close down to f4 ( the max appature of the DA15)?
Doing the same with K20D (FA31 at F2.0, ISO 200, P-TTL 540 tilted at 90) is correctly exposed. Unfortunately with K5 all I get is an overexposed image. Just have tested this to make sure. So FW1.12 definitely doesn't fix this problem -- at least not in my case. I can test with DA15 but I'm pessimistic.

01-13-2012, 01:28 PM   #47
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QuoteQuote:
So FW1.12 definitely doesn't fix this problem
Well, I did some very quick tests on bounce flash...

To me it seems that the issue has been solved to a degree. Previously, I needed different Flash Exposure settings for all my lenses. Most were -1.0 EV. The DA15 was correct at 0, while my Sigma 50mm f/1.4 needed around -1.7 EV.

Now, in my quick tests, setting it to -0.7 EV seems to be fairly correct for all lenses. Obviously, I need to test more but this is my initial observation.
01-13-2012, 06:21 PM   #48
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My previous test using P-TTL Metz 48AF-1 90 degree tilted with DA18-135WR (mostly at f5.6) at various distance without any issues.

I don't have FA31Ltd to test so I used the FA35/2. Tested at Av | Multi segments mettering Mode | ISO200 | f2 with Metz48 - 90 degree tilted with subject is my kids at 2m away. The result is also good without any over exposure. I tried the same combination at about 1.5m with both Center weighted as well as Multi-segments mettering mode and the results are also good.

I don't know whether there is any compartible issue between the Pentax flash and the K-5 or not.
01-13-2012, 11:06 PM   #49
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QuoteOriginally posted by fuf Quote
How did you test? Which settings, what lenses? I found out that with the older firmware the over/underexposures greatly depended on the lens used: overexporuse with FA31, FA77, bad underexposure with DA15, DA21.

With FA31, aperture set to 2.0, P-TTL with 540 with 90 bounce, ISO 200, Av mode and subject (a person) cca. 2m away I'm getting overexporuse with firmware 1.12. When I tested in an empty room the exposure was okayish.
I have made successfull tests with 3 lenses : DA 35mm F2,4, DA 70mm F2,4 Limited and Sigma 17-70mm F2,8-4,5

Exposure parameters : multi-segment metering, Mode M, 1/180s, F5,6, ISO 100

1. I determine the minimum distance of the subject with direct flash (range displayed on LCD). It's about 3m.
2. I put the subject at 4m beyond the minimum distance (all the objects before the minimum distance will be normally overexposed).
3. I take three photos, one with direct flash, the other with flash bounced toward the ceiling and another toward a wall (white wall and ceiling)

Prior the v1.12 firmware upgrade i had to reduce flash power with bounce flash. Now it's good. No overexosure with bounce flash. I observe an attenuation of the brightness with bounce flash when i compare to direct flash.

It seems like the K5 P-TTL was asking full power to the bounced flash prior the v1.12 firmware. Now power flash seems to be the same level for bounce and direct flash.

For your case i think overexposure of the subject at 2m is not anormal with the K5 because it is before the minimal flash distance range. Perhaps the K20D had a better result at 2m because its trend to preserve hilights. (prior the K5 i had a K20D)


Last edited by pscl57; 01-14-2012 at 03:17 AM.
01-14-2012, 03:38 AM   #50
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When I use the EVF my 35mm DA ltd hunts badly and the shutter sounds really laggy.

When i switch over to the normal view finder everything is quick, like really quick.

Is this a firmware thing (I'm on 1.01) or just because the LCD is running? I don't understand...
01-14-2012, 04:47 AM   #51
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QuoteOriginally posted by schnitzel von krumm Quote
When I use the EVF my 35mm DA ltd hunts badly and the shutter sounds really laggy.

When i switch over to the normal view finder everything is quick, like really quick.

Is this a firmware thing (I'm on 1.01) or just because the LCD is running? I don't understand...
I assume you mean live view. Live view uses contrast detect auto focus, while standard auto focus is a phase detect. Phase detect is a whole lot faster in general, although contrast detect doesn't have front focusing or back focusing issues when it finally locks. Its not a firmware thing, its just slow with live view focus.
01-14-2012, 05:12 AM   #52
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AF540FGZ bounce flash overexposure not fixed

K-5 with FW 1.12 and AF540FGZ still overexposing by approx 2ev with wide angle lens, slightly improving when zooming up.

The old AF500FTZ gives lot more acceptable results via ordinary TTL

This is the only dark side of my K-5 but would be very nice if Pentax finally fixed it (as they have acknowledged it ages ago)

David
01-14-2012, 01:39 PM   #53
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I've just done the 1.12 upgrade from 1.11, and all seems fine. I had not done extensive tests, but previously had inconsistent results with bounce flash (AFS540FGZ), more often than not getting overexposure as compared to direct flash. I had got into the workaround habit of FEC -1.5, which was mostly OK, but sometimes underexposed, which was annoying but fixable in PP. With 1.12, I seem to be getting consistently good exposures with bounce flash (tested with DA* 16-50, 100mm WR macro, and FA 77Ltd. (center spot metering). Although I didn't have problems before, AF is spot-on - maybe I'm imagining it, but it seems quicker, with less hunting. Overall I'm happy - upgrade recommended.

01-14-2012, 01:53 PM   #54
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QuoteOriginally posted by davidsladek Quote
The old AF500FTZ gives lot more acceptable results via ordinary TTL
On what camera?
01-14-2012, 04:04 PM   #55
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Last edited by beholder3; 08-12-2013 at 01:53 AM.
01-14-2012, 11:34 PM   #56
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Frustrating! The P-TTL bounce flash overexposure problem clearly isn't fixed.



All four of these shots were taken in Av mode, at f/4.5, ISO400, 60mm. In each case the camera gave me 1/125 shutter speed. I'm using an AF-360FGZ flash, in P-TTL mode obviously.

The direct-flash shots are exposed nicely. The bounce flash shots are very overexposed. Because all other exposure parameters are the same (ISO, f-num, shutter), I can only conclude that the K-5 just blasts the heck out of the flash when bounced, for no good reason.
01-14-2012, 11:59 PM   #57
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QuoteOriginally posted by TOUGEFC Quote
it does look like the flash over-exposure problem is now fixed
Plus 1 re this, just tested my Sigma 530, works a treat.
01-15-2012, 02:32 AM   #58
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My K-5 + FA43 with 1.12 became almost ideal in terms of AF.
01-15-2012, 11:56 AM   #59
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@Quicksand - Try doing a system reset. Might help.
01-15-2012, 12:10 PM   #60
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It meters with a pre-flash, right? (I don't have an off-camera flash, but am thinking about it, so am curious how it is supposed to work.) It seems like it shouldn't matter if bounced, diffused, or direct -- it just meters the light. (The camera doesn't "know" where the flash head is pointed, right?) Is the light level of the bounced pre-flash simply too low for the meter to handle so it shoots it full-power?
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