Originally posted by wowtip Shooting mostly family and kids, sometimes macro. Would be great if flash can work (semi) automatically with old K/M lenses or M42 lenses. I think Metz 64 has an "A" setting that could be used?
This is where another pitch for the Pentax AF360FGZ and AF540FGZ comes in. Both feature auto-thyristor flash control as well as the full range of Pentax TTL/P-TTL protocols. Prices used have moderated in recent years such that both are accessible.
Another option to consider might be to get a second, inexpensive, flash for non-P-TTL and auto-thyristor use in addition to a moderately-priced P-TTL unit. My Pentax AF280T fulfills that function on my K-3 with the advantage over many other vintage flash in that it has a safe trigger voltage. Might I also add that it also offers a surprising degree of flash dedication with Pentax dSLRs. When paired with an A-contact lens and depending on camera mode, mine will set the proper aperture and x-sync speed and also signal flash ready and whether the flash exposure was adequate. On many Pentax film SLRs as well as *ist series digital, it will also do TTL automation. I think I paid $35 USD for mine.
BTW...depending on feature and power requirements, one might want to take a close look at the Godox TT350P or the equivalent Flashpoint model.
Steve