K-s2 over exposure with 70mm limited

Desperado · 12-23-2016, 01:06 AM

Hi folks.My ks2 overexposures about 2.3 stops with 70mm limited,But with 18-55 al its all good. no over or underexposure.By the way the 70mm limited exposures were also fine with k100d ( again no under or over exposure).What do you think?

Na Horuk · 12-23-2016, 01:19 AM

Hm, first let's first make sure its nothing that can be easily fixed.
- Update the camera firmware to the latest one
- make sure there is no filter on the lens. Certain filters can confuse AF and metering in some situations
- make sure camera and lens contacts are clean, free of dust, grime or damage.
- make sure lens is fully mounted. Sometimes a new lens or camera might have a stubborn mount, but the lens has to click into place, otherwise camera might not be able to control it normally
- make sure you don't have EV + or spot metering or some type of bracketing or digital filters enabled. These options can cause unexpected exposures.
- Reset camera to default factory settings (note, this will overwrite your own settings)
- Try using green Auto mode, see if the lens exposes more normally (Then use M mode to check whether the problem is metering or stopping down the aperture)

If none of this fixes it, then you have to test the lens aperture lever. Sticky aperture blades or damaged aperture mechanism are common culprits for overexposure. You can test in Av mode and try a photo with wide open aperture, then one at f8. If the photo seems almost the same, then the problem is with aperture actuation. You can also look into the lens as you take a photo, to see if the aperture blades move into position. This can also be a problem in the camera aperture actuation motor. The K-30 has had some reports on this, but I thought the K-S2 was free of this issue.

12-23-2016, 01:06 AM	#1
Desperado Forum Member Join Date: Jul 2016 Posts: 51	K-s2 over exposure with 70mm limited Hi folks.My ks2 overexposures about 2.3 stops with 70mm limited,But with 18-55 al its all good. no over or underexposure.By the way the 70mm limited exposures were also fine with k100d ( again no under or over exposure).What do you think?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Incorrect exposure with Miranda 35-70mm K-mount	AchGup	Pentax SLR Lens Discussion	10	05-24-2020 04:09 AM
K-S2 Live View Exposure Simulation/Preview	anu l	Pentax K-S1 & K-S2	7	12-08-2015 12:52 PM
K-5 bounce flash over exposure with response from Metz	efkelly	Pentax K-5 & K-5 II	24	03-15-2011 08:52 PM
70mm Limited over-exposing	Talisman39	Pentax SLR Lens Discussion	6	12-23-2008 11:11 PM
70mm Limited over-exposing	Talisman39	Pentax SLR Lens Discussion	2	07-30-2008 09:21 AM

12-23-2016, 01:19 AM	#2
Na Horuk Veteran Member Join Date: Feb 2012 Location: Slovenia, probably Photos: Gallery \| Albums Posts: 11,186	Hm, first let's first make sure its nothing that can be easily fixed. - Update the camera firmware to the latest one - make sure there is no filter on the lens. Certain filters can confuse AF and metering in some situations - make sure camera and lens contacts are clean, free of dust, grime or damage. - make sure lens is fully mounted. Sometimes a new lens or camera might have a stubborn mount, but the lens has to click into place, otherwise camera might not be able to control it normally - make sure you don't have EV + or spot metering or some type of bracketing or digital filters enabled. These options can cause unexpected exposures. - Reset camera to default factory settings (note, this will overwrite your own settings) - Try using green Auto mode, see if the lens exposes more normally (Then use M mode to check whether the problem is metering or stopping down the aperture) If none of this fixes it, then you have to test the lens aperture lever. Sticky aperture blades or damaged aperture mechanism are common culprits for overexposure. You can test in Av mode and try a photo with wide open aperture, then one at f8. If the photo seems almost the same, then the problem is with aperture actuation. You can also look into the lens as you take a photo, to see if the aperture blades move into position. This can also be a problem in the camera aperture actuation motor. The K-30 has had some reports on this, but I thought the K-S2 was free of this issue.