Is there life after aperture block failure?

Futax wrote:

Massao wrote:

Av mode DOES NOT work fine. With most Pentax camera models, the aperture you set is not applied. Exposure may look OK, but all shots you take are taken with a wide open aperture. It doesn't stop down. Unless you have a K-50, which DOES stop down but will underexpose if left to its own devices.

Just for the love of science, I want to understand your thesis even further:

Ok, so if you set aperture on your adapted (50mm f/1.8) lens to f/5.6, your K-50 is still capable of taking an image wide open?

I see we have a smart alec in our midst.

No, no, you are the star of this show. I'm just trying to understand the intricate nature of your logic.

Note: my suggested use of Av mode may well not work with other Pentax models, but it does with the K-50 (at least it does with mine).

That I can agree on I don't know what kind of settings you have changed on your camera, but my sincere suggestion is to: 1) reset the camera; 2) change the necessary settings as recommended by PFhere , and; 3) try your manual lenses again. Also check that your manual lens actually changes the aperture when you stop it down. As long as you are using exposure compensation to properly expose an image, something is wrong with your setup! Simple as that!

I don't WANT to change - Av mode isn't MEANT to work with legacy lenses.

Don't you see - this is a useful undocumented feature of the K-50 which helps make up for its otherwise disgraceful failure mode.

Yes, what a discovery. I'm cheering for you already. Can't wait for this to reach the press. You rock!

I'm afraid sarcasm attempts serve only make you look more foolish.

Don't be angry. Bear with the ignorant pupils :-D. Please, just explain how would you take an image at f/5.6 with an adapted 50mm f/1.8 lens. This is your moment to shine. Reveal the magic! Your answer will solve the problem of so many Pentaxians that keep on taking wide-open images with adapted lenses.