Trouble Using Old Lenses On K100D

Recently bought a K100D to use all my old K-mount lenses on, but it seems two of them won't work at all with it.

One is a SMC Pentax-M 50mm and the other is a Vivitar 80-200mm MC.

The problem is that when I put either lens on and turn the K100 on, all that happens is that "Av --" keeps blinking in the viewfinder and on the display LCD and I can't take any pictures.

My other lenses that work all seem to be VMC, could that have something to do with it?

Am I overlooking something, or can I never use these lenses with this camera?

In one of the menus is an option along the lines of 'Allow use of lenses with aperture ring', which you need to select. This will let you set the aperture on the lens, and the body won't stop you taking the pic.

Someone here with a K100D will no doubt give you the right menu option to look for.

Dan

Hi Simon, and welcome to the forum..

If they fit, they'll work.. which is the good news. I'm sure you'll get a better explanation, but basically, switch to manual focus on the front of the camera, and set the dial to M for manual. Set the aperture on the lens and off you go.. ish. have a look through this thread, for a better idea.

https://www.pentaxuser.com/forum/viewtopic.php?t=4222

Cheers

Liam

I told you someone else would know what they're on about.. I forgot that setting in the menu Dan..

Cheers

Liam

Thank you so much, and thanks for the speedy reply.

It was called "Using aperture ring" in the Custom settings.