Originally posted by stevebrot - All M42 and K-mount lenses labeled as "Auto" have automatic apertures
- Semi-auto, pre-set, and manual aperture lenses are never labeled as "Auto"
- All lenses that support open-aperture metering are intrinsically "Auto" regardless of labeling
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Not quite true. Early Pentax semi-automatic lenses from the late fifties through the early sixties were offically known as "Auto Takumar" lenses. These lenses had a seperate lever to "cock" the aperture. When the shot was taken, the lens stopped down to the selected aperture, but it did not re-open.
Pentax kinda jumped the gun with that name. That's probably one reason why the next generation of lenses (still M42) from Pentax were called "Super Takumar".
To further confuse the issue, a few of the last "Auto Takumar" lenses had fully automatic apertures that DID re-open after exposure. I don't think that the anti-flare coatings were as good as the later Super Takumars and the SMC Takumars.
Semi-auto lenses are somewhat rare, so your list is still a pretty good rule of thumb. The word "auto" on non-Autofocus lenses, clearly refers to some level of aperture automation. For the OP's purposes, that's probably good enough.