Also with the so-called flagship models such as the K-3 set the DOF preview to optical. Then you can use the EV bars to set the exposure in Manual mode with non-A lenses (M, K, M42, T-mount/Fixed Aperture e.g. telescopes and mirror lenses, and "A" lenses off the "A" mode).
In M mode with non-A lenses
- half press to turn the meter on
- operate the DOF preview - this stops down K-mount lenses and takes a light reading through the lens and displays the EV bars
- adjust the exposure from the EV bars by setting the shutter speed with the eDial and/or turning the aperture ring. Screwmount lenses with the A/M switch should be set to "M" so the iris will close down.
Originally posted by ScooterMaxi Jim The confusion comes in regarding focus - as that is where the AF lenses have the added focus point features (beyond having AF itself, of course). "A" lenses have the single electrical contact, so you have no choice other than center spot for metering. This is still somewhat more dependable than the stop-down process for the M lenses. Electrical transmission of the aperture setting metering is somewhat more accurate.
With the AF set to AF-S Catch-in-Focus will work with Manual Focus lenses regardless of electrical pins or not. Caveat - with some bodies Catch-in-Focus may not work with non-conductive lens mounts such as T-adapters or some extension tubes. This is not definite and perhaps needs more exploration..