K50 images dark unless LV is on

shimself · 08-31-2020, 09:04 AM

We were comparing images between a K50 and a K200. The K 50 images were absurdly dark, even though both were set to Auto

In the course of messing about I discovered that selecting LV Liveview the images come out correct.

I actually reset factory defaults on the K50 in case it was some obscure setting, but it hasn't helped

Any ideas please

**marcusBMG** · 08-31-2020, 10:32 AM

See the threads discussing aperture solenoid failure here:

Pentax K-30 & K-50 - PentaxForums.com

**photogem** · 09-14-2020, 02:59 AM - **1 Like**

Originally posted by shimself

We were comparing images between a K50 and a K200. The K 50 images were absurdly dark, even though both were set to Auto

In the course of messing about I discovered that selecting LV Liveview the images come out correct.

I actually reset factory defaults on the K50 in case it was some obscure setting, but it hasn't helped

Any ideas please

It is the solenoid and you check as described here:
Detection of aperture block/diaphragm-block failure/stuck solenoid K-30, K-50, K500 - PentaxForums.com

Liveview does work for a time, but if you check EXIF-Data, you might notice that they don't match:
This is because in LV-Mode the camera has to measure with f4,0 but when the solenoid is stuck, aperture is full closed.
But because the solenoid actuates twice it often opens the 2.nd time and then enough light for the photo taken.
But the camera metered with f22 or f32, depending which AF-lens was used!

08-31-2020, 09:04 AM	#1
shimself New Member Join Date: Nov 2015 Posts: 2	K50 images dark unless LV is on We were comparing images between a K50 and a K200. The K 50 images were absurdly dark, even though both were set to Auto In the course of messing about I discovered that selecting LV Liveview the images come out correct. I actually reset factory defaults on the K50 in case it was some obscure setting, but it hasn't helped Any ideas please

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08-31-2020, 10:32 AM	#2
marcusBMG Site Supporter Join Date: Nov 2012 Location: North Wales Photos: Gallery \| Albums Posts: 2,718	See the threads discussing aperture solenoid failure here: Pentax K-30 & K-50 - PentaxForums.com

09-14-2020, 02:59 AM - 1 Like	#3
photogem Site Supporter Join Date: Apr 2015 Posts: 2,960	Originally posted by shimself We were comparing images between a K50 and a K200. The K 50 images were absurdly dark, even though both were set to Auto In the course of messing about I discovered that selecting LV Liveview the images come out correct. I actually reset factory defaults on the K50 in case it was some obscure setting, but it hasn't helped Any ideas please It is the solenoid and you check as described here: Detection of aperture block/diaphragm-block failure/stuck solenoid K-30, K-50, K500 - PentaxForums.com Liveview does work for a time, but if you check EXIF-Data, you might notice that they don't match: This is because in LV-Mode the camera has to measure with f4,0 but when the solenoid is stuck, aperture is full closed. But because the solenoid actuates twice it often opens the 2.nd time and then enough light for the photo taken. But the camera metered with f22 or f32, depending which AF-lens was used!

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