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Forum: Pentax K-30 & K-50 04-06-2022, 09:54 AM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
Anyone thinking that everything sold on eBay in large numbers must work only has to look at items like this [emoji1787]
https://www.ebay.co.uk/itm/Energy-Saver-Electricity-Saving-Box-Power-Factor-...-127635-2958-0
Forum: Pentax K-30 & K-50 04-05-2022, 11:03 PM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
Have you seen any evidence that they sell a lot of them? I have seen a lot of them for sale on eBay by lots of sellers but I haven't seen any actual feedback from anyone who bought one. I am obviously looking in the wrong places.
Forum: Pentax K-30 & K-50 04-24-2019, 11:49 PM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
Thanks I always wondered about that. Does the same apply to Optical Preview ?
Forum: Pentax K-30 & K-50 04-24-2019, 11:06 PM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
Does stop down metering with the green button use the solenoid?
Forum: Pentax K-30 & K-50 04-11-2019, 12:27 AM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
Meaning it acts differently if the wires are reversed.
Forum: Pentax K-30 & K-50 04-11-2019, 12:22 AM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
I just meant that if the solenoid contains a permanent magnet it will have an electric polarity. That is true isn't it?
Forum: Pentax K-30 & K-50 04-10-2019, 11:39 PM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
There is a permanent magnet in the solenoid which does give it polarity.
Forum: Pentax K-30 & K-50 03-10-2019, 11:34 AM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
I would say no. The resistance is too low. The correct one is 30 Ohms.
Forum: Pentax K-30 & K-50 02-01-2019, 08:53 AM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
OK I seem to recall others measured 15 ohms so you might have been lucky.
Forum: Pentax K-30 & K-50 02-01-2019, 08:17 AM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
I "think" they had a different resistance and were probably designed to work from a different voltage.
Forum: Pentax K-30 & K-50 02-01-2019, 07:58 AM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
I thought it had been established that DVD drive solenoids were not suitable.
Forum: Pentax K-30 & K-50 10-02-2017, 12:35 AM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By slartibartfast01
Replies: 417
Views: 109,634
The fact that these cameras used different solenoids for the two functions speaks volumes. Pentax must have been aware of a difference between them at that time.
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