It is ironic that legacy camera brand accessories can be less useful today than third party accessories of the same date, because the camera branded ones were tailored specifically to those cameras of that time. OTOH, third party brands like Vivitar, Sunpak and Metz, which were as well made if not better, went out of their way to make their accessories as versatile as possible.
WIth the AF140C, Pentax seemed to have put nearly all their eggs into the one basket of their brand specific TTL flash system of the time; this would have worked great with Pentax cameras of the time, but the full-power-only manual option seems to have been an afterthought for emergencies, letting you get a picture somehow perhaps if your main camera failed and you had to use your back-up K1000 or something. The Pentax AF080C would be better for close-up as it has the lower GN of 8 metres and can be reduced to 1/4 power as well.
Reading the ring flash reviews on PF I am puzzled why many reviewers complain of not enough power. I think they expect to use it for portraits. I do close-ups of technical subjects and tend to find there is too much power. I use an old Sunpak DX-8R that only cost me £10 onEbay and it has five manual power levels, from full all the way down to 1/16, and I use them. Incidentally, old-style AUTO (with a sensor on the flash unit) is useless for ring flash close up because the sensor is so out of line with the subject.
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