This is a K-3 with a Pentax M-1.7 50mm lens.
Using the viewfinder, pressing the green button or the DOF preview position on the power switch everything works great. The lens stops down to the aperture, the camera selects settings (green button), and the lens snaps back to full open aperture.
However, when using live view the lens does not "snap" back to full open.
It somewhat slowly returns to full open while making a disconcerting noise.
Is this normal behavior? Is live view using so much power to hold the mirror up that the camera has less power left to open the aperture back up? Is the spring in the lens almost too strong for the camera in this situation?
This "problem" does not present with the Pentax 18-135mm WR lens.
I received the K-3 just two weeks ago after being pentax-less for 4 years after a theft (of my K10D). I really like how the live view helps with manual focusing with the manual lens at low aperture settings, but now i am hesitant to use it in conjuction with the green button or dof preview for fear of damage to the camera..
Thanks,
Alex
Last edited by Quaffle; 04-08-2015 at 11:19 AM.
Reason: added details