Les Sarile
Member
I agree about DOF preview.
Now why Pentax refused to include exposure memory lock in their AE cameras for so long is a huge mystery. Even my LX lacks it, an absolutely glaring omission in an otherwise superb camera. The metering is probably the very best in camera meter of the pre-matrix days but it still needs it IMHO leading me to shoot on manual more often than I otherwise would and, worse, to sometimes forget to change back to AE and overlook the too-easily-overlooked manual flag in the finder, ruining some subsequent shots.
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Pentax included AE lock in the K2 DMD but I don't believe they incorporated AE lock again until the AF cameras.
Technically speaking, I don't believe AE lock adds any value unless you have a tight spot meter. The K2 DMD has center weighted metering and except for the Olympus OM3&4, I believe all the other manual focus cameras only have the fat spot metering. For AE lock to be useful on anything other than a tight spot meter, you would have to zoom at the area of the scene to lock onto, and then zoom back out to focus/recompose. If you know enough to do that then you can achieve same results using compensation or manual exposure as you pointed out.
The Minolta XK - along with exposure lock, has a very clever auto exposure override lever that is much easier to adjust than the typical exposure compensation control. The XK doesn't have a spot meter either but has what they call the CLC (Contrast Light Compensator). An early form of "matrix" metering.