Digital camera, pre-digital lens!

I own a Pentax K-m and recently bought a cheap 50mm f1.4 lens off ebay which is from pre-digital days. I've got it set up on the camera but would like some advice for the best settings to use in order to get the best from the lens. Any help or suggestions are welcome!

If it has an "A" setting then you can use it just like a "digital" lens, except for the lack of AF.

If no "A", set Using Aperture Ring to Permitted in the Custom menu. Av mode can be used as normal to use f1.4 only. Use M mode for smaller apertures and select the aperture by turning the aperture ring on the lens. Then press the Green button to set the shutter speed. Take a test shot and make manual adjustments as necessary.

When an extremely shallow depth of field is not required, get sharper results by stopping the lens down to f2.8 to f8.

The image is in focus when the green hexagon is displayed in the viewfinder. You can also try Catch-in Focus. See the manual for more on that.

ps. Just remembered the K-m doesn't have a Green button. I expect the AE-L button does the job.

Thanks for the information Iceblinker. I'll have a proper play with the lens over the weekend!