Problem with fixed aperture f8.0 on 500 mm mirror objektiv.
How can I change exposure time and get the camera to change ISO according to exposure time.
The only way seems to be to manually change ISO.
Anyone got another way to do it?
M or Tv does not give the possibility to change exposure time with the front or back wheel.

Now I have found it.
Menu Point 27 must be YES to allow aperture change.

Thank's any way.

Hi.
I have an old lens without A-mark, where i can change aperture ring manually.
However I can not set 'manual aperture move allowed' on the K05, but it works on K50.
Customer menu 4 on K05. The parameter is 'grey', can not change.
It must be some parameter blocking the K05, what could it be?
Anyone who knows?