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Forum: Pentax K-5 & K-5 II
05-16-2019, 04:51 PM
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Hi everyone,
I bought Sigma 10-20 F4-5.6 EX DC lens this week for my K5. It was a used copy but the seller told me it's in perfect condition and worked well with his K7 and K3 and he also had no problems with autofocus at all. Today I unpacked the package, attached lens to my K5 and ... the focal range appears. The same I see when I attach a manual lens. After confirming / canceling the focal length, the MF icon appears on the LCD screen, even though the focus mode lever is set to AF.C or AF.S mode. There is no F-- on the screen but I can not really control the aperture, because it shows me some incorrect values such as F1.2.
First thought – I bought a broken lens, but out of curiosity I've attached it to my old body – K100D and you won't belive. Autofocus as well as aperture works with it. The lens seems fine with K100D.
My other AF lenses such as Sigma 17-50 F2.8 EX DC HSM, Pentax-F 50 F1.7, Pentax-F 70-210 F4-5.6 and Pentax-DA 35 F2.8 Ltd works well with my K5. I have no problems with them at all. The body recognize all of them.
K5 firmware is up to date. 1.16 version.
I exclude dirty contact pins in K5 bayonet, since AF works in lenses I mentioned above. I also have to exclude dirty pins in Sigma 10-20 bayonet since it works correctly with K100D.
So what can be the reason that this Sigma does not work with my Pentax K5body?
Someone told me I have to send this lens to Sigma authorized repair distributor and they should update the lens software. It's strange a bit because K5 is older than K3 so if it worked on newer model, so why it doesn't work on the older one? What do you think about that guys? Does anyone of you had the same problems with Sigma lenses?
Cheers,
Maciek
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