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03-31-2019, 08:20 PM   #1
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K30 Liveview Vs Viewfinder Differences

Hello all, I'm having a problem when shooting with my k30 in Auto mode. When shooting through the viewfinder it is almost always overexposed. When I take the same picture in Liveview the exposure is correct. See example pictures attached. I have the same problem with multiple different lenses. If I set the camera to manual mode and select the settings the pictures taken with liveview and viewfinder are exactly the same. It's like the camera comes to different conclusions on on proper exposure settings when it's in liveview vs viewfinder. I don't use automode much but sometimes my wife uses the camera to take pictures at events and she just wants to use Auto mode with the 50mm or 35mm lenses and have good shots, not over exposed shots. At this point she just hates the camera

Anyone had this issue before? Sorry if it's a totally stupid questions but I'm fairly new to the Pentax K30.

Thanks for your help.

Attached Images
View Picture EXIF
PENTAX K-30  Photo 
View Picture EXIF
PENTAX K-30  Photo 
View Picture EXIF
PENTAX K-30  Photo 
View Picture EXIF
PENTAX K-30  Photo 
03-31-2019, 09:26 PM   #2
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When the camera is using the viewfinder it is using phase detect for autofocus whereas in live view it is using contrast detect. I assume the exposure is also calculated from the same contrast/phase detection systems.

As to why they would give different results though, I'm not sure.

Cheers
03-31-2019, 09:40 PM   #3
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When I turn the camera on manual focus and repeat the test it's the exact same problem. Over exposure when using the viewfinder perfect exposure with the LCD. It also has the same problem in all the scene modes.
03-31-2019, 09:45 PM   #4
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The viewfinder uses a meter up in the prism, whereas LV uses a reading direct from the sensor. So there can be a slight discrepancy, but this shows too much.

First i would suggest you use the same mode for some test shots. Your first example shows Program (auto) but the second picture shows Portrait mode ? Your second example shows auto versus Landscape.

Try using other modes such as Av or Tv and see what you get.

The metering is totally separate from the AF mode. But check your camera settings to make sure you have not enabled "metering linked to AF point"

03-31-2019, 10:18 PM   #5
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Same problem in Av mode, see attached. I checked all the settings for metering being linked to AF point and they're all disabled. When I enabled "Link Exposure and Focus Point" that actually seemed to help a little bit
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View Picture EXIF
PENTAX K-30  Photo 
04-01-2019, 02:50 PM   #6
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Is it possible that there is dust or similar contamination on the meter which is causing it to think the image is dark hence increase exposure?
I'm not sure if that meter is exposed when the mirror is up, if it is then a mirror-up clean with a rocket blower might be something to try.

Cheers,
Terry
04-01-2019, 03:36 PM   #7
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QuoteOriginally posted by tduell Quote
Is it possible that there is dust or similar contamination on the meter which is causing it to think the image is dark hence increase exposure?
I'm not sure if that meter is exposed when the mirror is up, if it is then a mirror-up clean with a rocket blower might be something to try.

Cheers,
Terry
Thanks, I'm going to take it into the shop this evening and see what they think. I'll mention the possible meter contamination. I took a look in there with the sensor in cleaning mode but I don't see anything out of the ordinary. I also have very little idea of what I'm looking at
04-01-2019, 04:13 PM   #8
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I did notice that the ISO changed from 2000 in the first photo to 3200 in the second one.
Must have set ISO to "auto".
Understanding will be easier if ISO is set to one value, which is used all the time, but that is not cause of the problem - just complicates thinking about the problem.

04-01-2019, 04:35 PM   #9
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QuoteOriginally posted by reh321 Quote
I did notice that the ISO changed from 2000 in the first photo to 3200 in the second one.
Must have set ISO to "auto".
Understanding will be easier if ISO is set to one value, which is used all the time, but that is not cause of the problem - just complicates thinking about the problem.
I locked in the ISO at 200 and repeated the test in Av mode @ F2.8. Still the same results, taken through the viewfinder and it's blown out and through the Liveview mode it's perfect. So frustrating... Hopefully the camera shop can sort it out.
04-01-2019, 06:46 PM   #10
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QuoteOriginally posted by cmichal Quote
I locked in the ISO at 200 and repeated the test in Av mode @ F2.8. Still the same results, taken through the viewfinder and it's blown out and through the Liveview mode it's perfect. So frustrating... Hopefully the camera shop can sort it out.
Do tell us what you find out - this type of problem has been reported on other occasions, and as far as I know, it has never been resolved {it certainly looks like an issue with metering in the prism housing}.
04-01-2019, 11:16 PM - 1 Like   #11
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QuoteOriginally posted by tduell Quote
Is it possible that there is dust or similar contamination on the meter which is causing it to think the image is dark hence increase exposure?
I'm not sure if that meter is exposed when the mirror is up, if it is then a mirror-up clean with a rocket blower might be something to try.

Cheers,
Terry
The meter is up in the pentaprism, the other side of the focussing screen. I am tending to think there is a problem with the meter itself.
04-02-2019, 08:32 AM   #12
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The camera store said nobody could fix it except Pentax / Precision because the meter is buried quite far inside. It's out of warranty so to pay to send in for repair isn't worth it for me compared to the price of a new camera. Probably just end up going with the K-70.
04-02-2019, 09:02 AM   #13
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QuoteOriginally posted by cmichal Quote
The camera store said nobody could fix it except Pentax / Precision because the meter is buried quite far inside. It's out of warranty so to pay to send in for repair isn't worth it for me compared to the price of a new camera. Probably just end up going with the K-70.
So they are fairly sure the meter is bad?

That is unfortunate.
04-02-2019, 11:09 AM   #14
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QuoteOriginally posted by cmichal Quote
Same problem in Av mode, see attached. I checked all the settings for metering being linked to AF point and they're all disabled. When I enabled "Link Exposure and Focus Point" that actually seemed to help a little bit
This example only shows about 1.5 stop difference (Top: LV 3.7 vs. Bottom: LV 1.6) rather than the huge difference in the original post. Part is the matter of having scene mode active, but still, there is something subtle going on here in regards to metering.

To avoid confusion with example photos you might give a repair tech, I would turn off face detection in Live View and use fixed rather than auto ISO.


Steve
04-02-2019, 02:27 PM   #15
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We did some testing in Av mode with the ISO fixed at 200. Still the same problem. The problem shows less of a variance in stops between the two shooting methods in darker situations. With outdoor sunny situations the shots through the viewfinder are extremely blown out and the live view shots are perfectly exposed. I didn't notice that selecting full Auto mode will basically switch you into a scene mode until I uploaded the initial shots otherwise I would have used Av mode.
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