K-3 III firmware 1.02 and D FA 150-450 issues

Started 2 months ago | Discussions thread
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Kobie M-C
Kobie M-C Regular Member • Posts: 360
K-3 III firmware 1.02 and D FA 150-450 issues

Can anyone please check this on your K-3 III?
At full 450 mm my K-3 III shows F/4.5 and AF stops working. The lens just hunts forever. I tried every single combination between lens and body.

150-450 = QFS, 2-6 Meters, 6 meters to infinity, Full, all Presets, Full.

K-3 III = Both AF.S and AF.C.
Spot, SEL, SEL-EX S, M, L, Full Auto, Zone, nothing made a difference . Moving 1 mm less on the lens barrel, it changes back to F/5.6 and the AF works fine.
Switched to my HD DA 55-300 PLM and no issues.
Checked the 150-450 contacts/cleaned them, same issue.
Has anyone else encountered this?
Did you find a fix other than shooting just short of 450?

I am not a Pentax insider. I just have a unique way of gaining insight.

 Kobie M-C's gear list:Kobie M-C's gear list
Pentax K-30 Pentax K-3 Pentax K-3 Mark III Pentax smc DA 18-135mm F3.5-5.6ED AL [IF] DC WR Sigma 17-70mm F2.8-4 DC Macro OS HSM +7 more
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