Originally posted by Kevin B123 I have seen mention of M42 lenses in these threads for some time, but I thought any lens with an aperture ring would make the camera function in manual mode?.
I brought a dirt cheap F 35-80 mm just in case and have tried it with the ring set to f8 and menu C22 set to 2 and it seemed to work OK. Is there something special with M42 lenses?, I am not familiar with them.
Use of aperture ring on K-mount lenses is "crippled" in modern Pentax cameras, and metering is done via the green button. I'm not quite sure what is involved internally, but I'm thinking that this metering wouldn't work right if there is an issue with the aperture control mechanism - that is why I regularly mention the M42-mount lenses.
M42-mount lenses require use of an adapter, but once you are set up, usage is completely manual - in metering, all the camera does is read light hitting the sensor, so my personal plan involves M42-mount lenses, because I know that they will work with a camera still capable of taking pictures, while I'm not positive how much other functionality needs to remain in order to use a basic K-mount lens.