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I'm looking for a lens Pentax 105mm F2.4 67 Any idea how to find the old fab lens?

Opinions required please :D I’m contemplating getting a MF camera which is a bit quicker to use when I’m on holiday, as the 500c/m and RB67 etc take a bit too long to use when you’re walking about (there are only so many times my girlfriend can wait for me to compose, meter and focus a shot...