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10-24-2010, 03:24 PM   #1
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is my 2 days old k5 faulty?

Need advise from k5 users.... I'v just realized that my k5 refuses to cooperate with external flash gun (iv checked with 3flashguns: 1 metz 2 pentax). It always overexposures 3-4ev, with built-in flash everythings fine does it mean that my camera is faulty? Haw about yours? Iv checked one more option and it turned out that at iso100 everythings perfect!!!! ones i change iso a little bit higher it overexposures at the fraction of rised iso.... any clue?


Last edited by filorp; 10-24-2010 at 03:31 PM.
10-24-2010, 03:28 PM   #2
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Which lens? If the lens has an aperture ring it must be set to "A" or else the flash will fire at full power.

Another possible source of error: Your flashes do nut support P-TTL.
10-24-2010, 03:33 PM   #3
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thanx ole everything should work properly lens is da17-70 and flash fgz540 and metz 48af-1 strange thing with iso though.....
10-24-2010, 03:35 PM   #4
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With a powerful external flash you have to make sure not no use to high ISO. I have also noted that the flash sometimes sits badly in the hot shoe, and then the camera (K7) overexposes.

10-24-2010, 03:49 PM   #5
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if i set my metz at 1/32 or 1/64 of power in manual mode everything is fine even at iso3200 - ofcourse if exposure is adequate to ambient light.... something wrong with comunication about iso applied no clue
10-24-2010, 04:00 PM   #6
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My K-5 also consistently overexposes by a great deal with my AF360FGZ when set to P-TTL on all the lenses I've tested (DA 35 ltd, 15 ltd, 55-300). In Auto mode, it works fine. I also just tested it on my K-x to make sure the flash isn't broken. It works fine in P-TTL.

I hope it's just some obvious setting we're missing.

Last edited by Cannikin; 10-24-2010 at 04:06 PM.
10-24-2010, 04:06 PM   #7
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QuoteOriginally posted by Cannikin Quote
I hope it's just some obvious setting we're missing.
thanx Cannikin its relief but it puts new pentax in very very bad light.... or we need fw upgrade.... does yours work fine with built flash as well?

Last edited by filorp; 10-24-2010 at 04:23 PM.
10-24-2010, 04:41 PM   #8
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Mine works fine w/ a Metz 58 flash, I do need to add a bit EV when shooting macros (in matrix metering) though, as I've been doing w/ all my other Pentax dSLR cameras:

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10-24-2010, 04:51 PM   #9
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Update: my K-5 and flash now appear to be working correctly in P-TTL mode. I don't know why, because I didn't change any settings.

The only thing I did was move the flash from my K-x back to my K-5. I guess reseating it might have done something, but I had tried reseating and tightening it several times before, so it's far from conclusive.

EDIT: I spoke too soon. It works ok in direct flash, but using the wide angle diffuser and bounce card still tends to overexpose.
10-24-2010, 05:00 PM   #10
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QuoteOriginally posted by filorp Quote
if i set my metz at 1/32 or 1/64 of power in manual mode everything is fine even at iso3200 - ofcourse if exposure is adequate to ambient light.... something wrong with comunication about iso applied no clue
I'm confused. Why are you using iso3200 with a flash?
10-24-2010, 05:06 PM   #11
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QuoteOriginally posted by Rory Quote
I'm confused. Why are you using iso3200 with a flash?
its actually common technik - if you wolud like to use the flash as fill light only in order to save the influence of ambient light, not as a main source of light you set exposure couple of ev below the ambient light and use the flash to fill the rest....
10-24-2010, 05:08 PM   #12
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QuoteOriginally posted by Rory Quote
I'm confused. Why are you using iso3200 with a flash?
Agree, try setting ISO to 400 then let us know if it still overexposes.
10-24-2010, 05:29 PM   #13
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QuoteOriginally posted by filorp Quote
Need advise from k5 users.... I'v just realized that my k5 refuses to cooperate with external flash gun (iv checked with 3flashguns: 1 metz 2 pentax). It always overexposures 3-4ev, with built-in flash everythings fine does it mean that my camera is faulty? Haw about yours? Iv checked one more option and it turned out that at iso100 everythings perfect!!!! ones i change iso a little bit higher it overexposures at the fraction of rised iso.... any clue?
What mode are you shooting in? Try manual mode, if you aren't already (set aperture, ISO and shutter). Use FEC to adjust if needed (making sure regular Exposure comp is not set). Work now? Mine works extremely well (need slight FEC at higher ISO). Very consistent results (Metz 58AF-1)
10-24-2010, 05:31 PM   #14
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yes i'v tried this.... the more i wrise the iso the more overexposure i get, iso 100 is ok, iso200 is just 2 times brighter iso 400 is 3times brigter and so on... everything in environment where you need 1/20s iso3200 f4 without the flash. The problem is that... my k20d works fine with the same settings and gear.....and with built flash everythins fine as well

Last edited by filorp; 10-24-2010 at 05:37 PM.
10-24-2010, 05:37 PM   #15
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Here are some straight out of camera (and resized) JPEGs to show what it looks like for me. Yeah, I'm a noob with flash technique, but this is just a controlled test.

Same lens and flash: DA 35 ltd, AF-360FGZ
Both cameras manually set to the same settings: 1/80s, ISO 200, f/4
Flash configuration unchanged both times: P-TTL, 90 degree angle, diffuser, bounce card up

K-x:




K-5:




K-5, flash set to Auto instead of P-TTL, everything else the same:



EDIT: oops, the original K-x shot was set to ISO 400. Redid the shot at ISO 200.

Last edited by Cannikin; 10-24-2010 at 05:48 PM.
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