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Forum: Pentax SLR Lens Discussion 05-05-2018, 10:22 PM  
K-1 and porst 55mm/1.2 no aperture control?
Posted By funkythiru
Replies: 30
Views: 2,676
Thanks again
Forum: Pentax SLR Lens Discussion 05-05-2018, 09:39 PM  
K-1 and porst 55mm/1.2 no aperture control?
Posted By funkythiru
Replies: 30
Views: 2,676
I tried with a strip of Al foil, the aperture value went from "--" to 2.4 - 22 range, worried pieces of foil might fall into the body though. So I just short the data pin to the mount/flange and I'm good ? Thanks
Forum: Pentax SLR Lens Discussion 05-05-2018, 08:48 PM  
K-1 and porst 55mm/1.2 no aperture control?
Posted By funkythiru
Replies: 30
Views: 2,676
Good idea. Thanks

---------- Post added 05-05-18 at 08:49 PM ----------


Thanks for the good suggestion.
Forum: Pentax SLR Lens Discussion 05-05-2018, 08:20 PM  
K-1 and porst 55mm/1.2 no aperture control?
Posted By funkythiru
Replies: 30
Views: 2,676
I just tried 100% acetone, didn't work, Would the NaOH affect the metal? next resort is some aircraft paint stripper.
Forum: Pentax SLR Lens Discussion 05-05-2018, 07:57 PM  
K-1 and porst 55mm/1.2 no aperture control?
Posted By funkythiru
Replies: 30
Views: 2,676
That's what I was thinking. Would it be better to paint strip it rather than to sand it?
Forum: Pentax SLR Lens Discussion 05-05-2018, 07:56 PM  
K-1 and porst 55mm/1.2 no aperture control?
Posted By funkythiru
Replies: 30
Views: 2,676
I'm beginning to think this is a porst peculiarity. Overexposed in the porst.
Forum: Pentax SLR Lens Discussion 05-05-2018, 07:21 PM  
K-1 and porst 55mm/1.2 no aperture control?
Posted By funkythiru
Replies: 30
Views: 2,676
It changes the shutter speed but aperture value remains "--". With my k lens 50/1.4 when I set the value on the aperture ring to 22 and press the shutter button I see the blades actuate. On the porst no such actuations. I shine a pen-torch into the lens to see the actuations. Thanks.

---------- Post added 05-05-18 at 07:23 PM ----------


Not on the porst.
Forum: Pentax SLR Lens Discussion 05-05-2018, 05:20 PM  
K-1 and porst 55mm/1.2 no aperture control?
Posted By funkythiru
Replies: 30
Views: 2,676
k-mount
Forum: Pentax SLR Lens Discussion 05-05-2018, 04:13 PM  
K-1 and porst 55mm/1.2 no aperture control?
Posted By funkythiru
Replies: 30
Views: 2,676
You're right, at 22 it dilates, at 1.2 the tab moves when manipulated but no changes in the aperture.
Forum: Pentax SLR Lens Discussion 05-05-2018, 03:38 PM  
K-1 and porst 55mm/1.2 no aperture control?
Posted By funkythiru
Replies: 30
Views: 2,676
When the lens is off the body the aperture ring works. When I manually move the metal tab when set at 22 the blades work. I have a pentax k 50/1.4 the ring works while on the camera. dfa 28-105mm works. Rokinon 85/1.4 works. PPF how would you know if it is the lens itself is faulty? Thanks guys
Forum: Pentax SLR Lens Discussion 05-05-2018, 02:37 PM  
K-1 and porst 55mm/1.2 no aperture control?
Posted By funkythiru
Replies: 30
Views: 2,676
I tried enabling and disabling aperture in the menu pg 26. Tried covering up the contacts on the body. What can I do to control the aperture? Even the ring doesn't change the values (always at 1.2). Any suggestions are welcome.
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