DA* 300 f4.0 + K3II connection issue

**Perfessor5646** · 07-14-2019, 11:54 AM

Starting after lunch today, when I mount the DA* 300 on my K3-II, the AF/MF indicator flashes rapidly back and forth as does the metering mode indicator. It will not autofocus nor let me activate the shutter.

In trying to determine if this is a lens problem or a K3II body problem, I’ve tested several other lenses on the K3-II body and the DA*300 on my K70 body and everything seems to work normally. It’s a weird thing because before lunch I took that combination to dog park and all worked as normal.

Anybody else experienced this?

Adam · 07-14-2019, 11:59 AM

Have you already tried cleaning the contacts on the camera and lens? That often helps.

**sergysergy** · 07-14-2019, 12:27 PM

Clean the contacts and tighten the screws both in the camera and the lens

**Perfessor5646** · 07-14-2019, 12:48 PM

I’ve cleaned the contacts twice. (I have an authentic Pentax Camera Maintenance Kit II I inherited from Dad,) And I’ve checked the mount screws on the lens and the body. None were loose. Neither made a difference.

stevebrot · 07-14-2019, 02:57 PM - **1 Like**

The symptoms you describe indicate that the body is not detecting the "A" pin on the lens. Causes include a wiring fault/board failure in either camera or lens, water intrusion of either camera or lens, dirty contacts, or the lens not registering properly to the mount contacts.

Steve

**Perfessor5646** · 07-14-2019, 03:57 PM

Originally posted by stevebrot

The symptoms you describe indicate that the body is not detecting the "A" pin on the lens. Causes include a wiring fault/board failure in either camera or lens, water intrusion of either camera or lens, dirty contacts, or the lens not registering properly to the mount contacts.

Steve

That’s it. There are two small metal contacts on the lens and one was bent just slightly askew. All it took was a push with my finger tip and everything seems to be back to normal. I got befuddled when I couldn’t replicate the problem on my other body or with any other lens.

Thanks!

siva.ss.kumar · 07-14-2019, 08:09 PM

Same thing happened to my 560 also. The pin was bent back. I had to push it inside to keep it working.
I wish Pentax made it durable. I am scared that one day the pin will break. I am.being careful when putting my lens cap and also when mounting the camera

07-14-2019, 11:54 AM	#1
Perfessor5646 Loyal Site Supporter Join Date: Jul 2018 Location: Louisville, KY Photos: Albums Posts: 605	*DA 300 f4.0 + K3II connection issue** Starting after lunch today, when I mount the DA* 300 on my K3-II, the AF/MF indicator flashes rapidly back and forth as does the metering mode indicator. It will not autofocus nor let me activate the shutter. In trying to determine if this is a lens problem or a K3II body problem, I’ve tested several other lenses on the K3-II body and the DA*300 on my K70 body and everything seems to work normally. It’s a weird thing because before lunch I took that combination to dog park and all worked as normal. Anybody else experienced this?

07-14-2019, 11:59 AM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,609	Have you already tried cleaning the contacts on the camera and lens? That often helps. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

07-14-2019, 03:57 PM	#6
Perfessor5646 Loyal Site Supporter Join Date: Jul 2018 Location: Louisville, KY Photos: Albums Posts: 605 Original Poster	Resolved Originally posted by stevebrot The symptoms you describe indicate that the body is not detecting the "A" pin on the lens. Causes include a wiring fault/board failure in either camera or lens, water intrusion of either camera or lens, dirty contacts, or the lens not registering properly to the mount contacts. Steve That’s it. There are two small metal contacts on the lens and one was bent just slightly askew. All it took was a push with my finger tip and everything seems to be back to normal. I got befuddled when I couldn’t replicate the problem on my other body or with any other lens. Thanks!

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07-14-2019, 12:27 PM	#3
sergysergy Site Supporter Join Date: Jan 2011 Photos: Gallery Posts: 5,176	Clean the contacts and tighten the screws both in the camera and the lens

07-14-2019, 12:48 PM	#4
Perfessor5646 Loyal Site Supporter Join Date: Jul 2018 Location: Louisville, KY Photos: Albums Posts: 605 Original Poster	I’ve cleaned the contacts twice. (I have an authentic Pentax Camera Maintenance Kit II I inherited from Dad,) And I’ve checked the mount screws on the lens and the body. None were loose. Neither made a difference.

07-14-2019, 02:57 PM - 1 Like	#5
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	The symptoms you describe indicate that the body is not detecting the "A" pin on the lens. Causes include a wiring fault/board failure in either camera or lens, water intrusion of either camera or lens, dirty contacts, or the lens not registering properly to the mount contacts. Steve

07-14-2019, 08:09 PM	#7
siva.ss.kumar Pentaxian Join Date: Jan 2008 Location: Chennai, India Photos: Albums Posts: 534	Same thing happened to my 560 also. The pin was bent back. I had to push it inside to keep it working. I wish Pentax made it durable. I am scared that one day the pin will break. I am.being careful when putting my lens cap and also when mounting the camera