Is there life after aperture block failure?

peterpainter wrote:

Massao wrote:

peterpainter wrote:

Futax wrote:

You could also try using Av mode. On my K-50, the camera still stops down the aperture as defined by the ring. Since the camera doesn't actually know that aperture, you need to get it to provide the correct exposure, and you can do that by using exposure compensation. If you're shooting wide open, then exposure is correct without compensation. Otherwise use the appropriate compensation.

Seems to be a much more accurate method for getting the correct exposure than using the green button in M mode. Also, can make shooting off several frames a lot quicker.

The camera is pretty-much always et on AV mode and was when I was getting odd exposures using just the shutter button rather than the green button. As I mentioned in another comment, I'll experiment further but from limited testing today the green button seems to work better - and frankly, I can't understand why it should!

Ok, then I wonder whether you have done these changes in settings as recommended by PF. See here .

Not setting the green button to TV shift as recommended. Unfortunately on my K50 it does not allow me to do that with a manual lens attached! Very odd - basically doesn't show settings for the 'wheels' either.....

That's because TV mode requires the camera to adjust the aperture for the fixed shutter speed you have specified. It works on A lenses but not M lenses. i.e. lenses with 'A' setting on the aperture ring so the camera sets the aperture instead of it being set by twisting the aperture ring. 😉