Thanks for replying.
Yes i can reproduce this problem every time i use the camera with the 50 mm lens. The only way it works is using a lower speed like 8 or a 4. And with the tokina lens works perfectly any time.
My cousin notice something that is that the tokina lens doesn't have the dynamic aperture coupler
And the pentax lens does have it
He told me that maybe taking out than coupler it might work, but i don't know if that's true or even worse, i don't know if that might damage the lens.
About the mirror getting stuck i don't think is the foam, because if i use the camera with the tokina lens or without lens it doesn't get stuck only with the pentax lens. I think the coupler besides the mirror is the one that gets stuck.
What can it be?
Last edited by mycroft; 06-22-2009 at 05:11 PM.
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