K5 with AF360 Sigma 18-200af problems

K200Duser · 08-26-2014, 03:05 PM

Pentax K5 on program mode.
Pentax AF360fgz on first curtain P-TTL
Sigma 18-200mm AF DC shot at about 145mm

Hi, when I shoot using this zoom, every 5th shot or so I get one or two way underexposed images, then some proper ones, then some bad ones as shown. This does not happen around the 18-50mm range of the lens.
I have the same thing happening with my 18-300?
I have tried all the types of different metering, focusing, and flash settings (HS or first, second curtain)
Auto flash zooming is working fine on the flash, I always wait till the flash is fully charged, contacts are clean.

Anyone else experiencing this?

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**boriscleto** · 08-26-2014, 03:24 PM

Do you have bracketing turned on?

K200Duser · 08-26-2014, 03:27 PM

Originally posted by boriscleto

Do you have bracketing turned on?

Nope, all individual shots..

chromo · 08-26-2014, 04:06 PM

You could try cleaning the contacts of the lens and camera with alcohol, but considering the exif data shows the same settings (shutter speed, aperture, iso etc.), I would think there is something wrong with the flash unit.
Maybe try cleaning the flash contacts too.
I guess you cant rule out the camera being faulty as well.

K200Duser · 08-27-2014, 03:24 PM

I noticed that if I shoot with the flash on "A" and the camera at Aperture priority there are no problems with the images, even when shooting full zoom (200mm) and about 24 feet distance, though I have to remember to manually adjust the flash zoom, and make sure the f stops are the same on the flash and the camera... I must have some sort of P-TTL flash problem???

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08-26-2014, 03:24 PM	#2
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,476	Do you have bracketing turned on?

08-26-2014, 03:27 PM	#3
K200Duser Inactive Account Join Date: Mar 2009 Location: Fort Erie Ontario Canada Posts: 18 Original Poster	Originally posted by boriscleto Do you have bracketing turned on? Nope, all individual shots..

08-26-2014, 04:06 PM	#4
chromo Veteran Member Join Date: Feb 2010 Location: North Coast NSW Photos: Gallery \| Albums Posts: 581	You could try cleaning the contacts of the lens and camera with alcohol, but considering the exif data shows the same settings (shutter speed, aperture, iso etc.), I would think there is something wrong with the flash unit. Maybe try cleaning the flash contacts too. I guess you cant rule out the camera being faulty as well.

08-27-2014, 03:24 PM	#5
K200Duser Inactive Account Join Date: Mar 2009 Location: Fort Erie Ontario Canada Posts: 18 Original Poster	I noticed that if I shoot with the flash on "A" and the camera at Aperture priority there are no problems with the images, even when shooting full zoom (200mm) and about 24 feet distance, though I have to remember to manually adjust the flash zoom, and make sure the f stops are the same on the flash and the camera... I must have some sort of P-TTL flash problem???