70-200 AF issue

hamidamin · 04-22-2019, 05:40 AM

Hi everyone,

My 70-200 has stopped AF all of a sudden on both med K-1 II and my old K-5. Is it bad?

Thank you

Regards
Hamid

**pepperberry farm** · 04-22-2019, 05:41 AM

which 70-200?

Medex · 04-22-2019, 07:44 AM

Originally posted by hamidamin

Hi everyone,

My 70-200 has stopped AF all of a sudden on both med K-1 II and my old K-5. Is it bad?

Thank you

Regards
Hamid

It is bad if you are upset. Do other lenses focus normally?

hamidamin · 04-22-2019, 02:26 PM

Yes they do. I have been through all settings and tried to find something "I" hopefully have done wrong�� I think I have to do without it for a while. Anyways... thank you for your answer Medex.

Regards
Hamid

---------- Post added 04-22-19 at 02:26 PM ----------

It is Pentax HD D FA*70-200 mm f/2.8 ED DC AW "pepperberry farm"

garywakeling · 04-22-2019, 03:58 PM

Have you checked the switches on the lens itself?

sungibr · 04-23-2019, 04:43 AM

Originally posted by hamidamin

Hi everyone,

My 70-200 has stopped AF all of a sudden on both med K-1 II and my old K-5. Is it bad?

Thank you

Regards
Hamid

Its a long shot, but, the SDM contacts are intact? I saw one guy who bought a new D-FA* 50mm that had the contacts of his lens broken.

And what you mean by "pepperberry farm? I'm not northamerican (nor english native) and was just curious about what that means.

hamidamin · 04-23-2019, 05:05 AM

Originally posted by sungibr

Its a long shot, but, the SDM contacts are intact? I saw one guy who bought a new D-FA* 50mm that had the contacts of his lens broken.

And what you mean by "pepperberry farm? I'm not northamerican (nor english native) and was just curious about what that means.

Thanks for your input. I have double checked the contacts and they seem to be ok.

"Pepperberry farm" is the name of a person here, who has sent his/her suggestion

---------- Post added 04-23-19 at 05:07 AM ----------

Originally posted by garywakeling

Have you checked the switches on the lens itself?

@garywakeling:

The switches on the lens are correct positioned. I am afferaid there must be something wrong with the machinery inside

hamidamin · 04-23-2019, 11:30 PM - **1 Like**

Originally posted by sungibr

Its a long shot, but, the SDM contacts are intact? I saw one guy who bought a new D-FA* 50mm that had the contacts of his lens broken.

And what you mean by "pepperberry farm? I'm not northamerican (nor english native) and was just curious about what that means.

You were right anyways about SDM contacts. I think I had checked the contacts in frustration and just overlooked them

I took a look at it early in the morning with fresh eyes and then I saw the problem. The one contact was bent away, in the wrong direction... somehow

I don't understand HOW it happens!

I gently bent it back in place and it works now even though it is still not perfectly in place!

Thank you every one very much anyway.

sungibr · 04-24-2019, 04:52 AM

Originally posted by hamidamin

You were right anyways about SDM contacts. I think I had checked the contacts in frustration and just overlooked them

I took a look at it early in the morning with fresh eyes and then I saw the problem. The one contact was bent away, in the wrong direction... somehow

I don't understand HOW it happens!

I gently bent it back in place and it works now even though it is still not perfectly in place!

Thank you every one very much anyway.

Happy to know it was "just" this. But my opinion is this is one design flaw. As I noted, it has happened with a brand new D-FA* 50mm (can't find the original post). And also with my 16-50 (broke the 2 contacts altogether), although this one is 7yrs old and hacked to screwdrive, so no problem doing AF.

I'm keeping eye on this 70-200 lens, cos I planning to buy it someday, but here in my country we have none pentax servicing for newer lenses, so reliabillity is a concern.

Glad to know, failures are really unlikelly with those now.

edit: I was thinking...maybe one could put a very little drop of superglue BELOW the contacts, to fix it in place and diminish the odds of then to bend over again...should it work?

biz-engineer · 04-24-2019, 06:13 AM

Originally posted by hamidamin

I gently bent it back in place and it works now even though it is still not perfectly in place!

That's an interesting photograph you shared here. We see some scratch / wear on the mount. This kind of wear happens when attempting to mount connect the lens mount to camera mount with the red dots not well aligned. When the dots are well aligned first, then pressing in and turning the bayonet does not wear mount/contacts.

hamidamin · 04-24-2019, 10:41 PM

Originally posted by biz-engineer

That's an interesting photograph you shared here. We see some scratch / wear on the mount. This kind of wear happens when attempting to mount connect the lens mount to camera mount with the red dots not well aligned. When the dots are well aligned first, then pressing in and turning the bayonet does not wear mount/contacts.

I am afraid it has happened from time to time. I have been in a rush and was not cautious

But I think I have learned the lesson

And thank you very much for the good explanation.

Regards
Hamid

04-22-2019, 05:40 AM	#1
hamidamin Forum Member Join Date: Feb 2016 Location: Nordfyn Photos: Gallery Posts: 68	70-200 AF issue Hi everyone, My 70-200 has stopped AF all of a sudden on both med K-1 II and my old K-5. Is it bad? Thank you Regards Hamid

04-24-2019, 04:52 AM	#9
sungibr Senior Member Join Date: Jan 2011 Location: Sao Paulo Photos: Albums Posts: 149	Originally posted by hamidamin You were right anyways about SDM contacts. I think I had checked the contacts in frustration and just overlooked them I took a look at it early in the morning with fresh eyes and then I saw the problem. The one contact was bent away, in the wrong direction... somehow I don't understand HOW it happens! I gently bent it back in place and it works now even though it is still not perfectly in place! Thank you every one very much anyway. Happy to know it was "just" this. But my opinion is this is one design flaw. As I noted, it has happened with a brand new D-FA* 50mm (can't find the original post). And also with my 16-50 (broke the 2 contacts altogether), although this one is 7yrs old and hacked to screwdrive, so no problem doing AF. I'm keeping eye on this 70-200 lens, cos I planning to buy it someday, but here in my country we have none pentax servicing for newer lenses, so reliabillity is a concern. Glad to know, failures are really unlikelly with those now. edit: I was thinking...maybe one could put a very little drop of superglue BELOW the contacts, to fix it in place and diminish the odds of then to bend over again...should it work? Last edited by sungibr; 04-24-2019 at 05:03 AM.

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04-22-2019, 05:41 AM	#2
pepperberry farm amateur dirt farmer Join Date: Dec 2014 Location: probably out in a field somewhere... Photos: Gallery \| Albums Posts: 41,751	which 70-200?

04-22-2019, 07:44 AM	#3
Medex Pentaxian Join Date: May 2013 Location: Vilnius Posts: 1,021	Originally posted by hamidamin Hi everyone, My 70-200 has stopped AF all of a sudden on both med K-1 II and my old K-5. Is it bad? Thank you Regards Hamid It is bad if you are upset. Do other lenses focus normally?

04-22-2019, 02:26 PM	#4
hamidamin Forum Member Join Date: Feb 2016 Location: Nordfyn Photos: Gallery Posts: 68 Original Poster	Yes they do. I have been through all settings and tried to find something "I" hopefully have done wrong�� I think I have to do without it for a while. Anyways... thank you for your answer Medex. Regards Hamid ---------- Post added 04-22-19 at 02:26 PM ---------- It is Pentax HD D FA*70-200 mm f/2.8 ED DC AW "pepperberry farm"

04-22-2019, 03:58 PM	#5
garywakeling Moderator Join Date: Jul 2011 Location: Melbourne Photos: Gallery \| Albums Posts: 1,761	Have you checked the switches on the lens itself?

04-23-2019, 04:43 AM	#6
sungibr Senior Member Join Date: Jan 2011 Location: Sao Paulo Photos: Albums Posts: 149	Originally posted by hamidamin Hi everyone, My 70-200 has stopped AF all of a sudden on both med K-1 II and my old K-5. Is it bad? Thank you Regards Hamid Its a long shot, but, the SDM contacts are intact? I saw one guy who bought a new D-FA* 50mm that had the contacts of his lens broken. And what you mean by "pepperberry farm? I'm not northamerican (nor english native) and was just curious about what that means.

04-23-2019, 05:05 AM	#7
hamidamin Forum Member Join Date: Feb 2016 Location: Nordfyn Photos: Gallery Posts: 68 Original Poster	Originally posted by sungibr Its a long shot, but, the SDM contacts are intact? I saw one guy who bought a new D-FA* 50mm that had the contacts of his lens broken. And what you mean by "pepperberry farm? I'm not northamerican (nor english native) and was just curious about what that means. Thanks for your input. I have double checked the contacts and they seem to be ok. "Pepperberry farm" is the name of a person here, who has sent his/her suggestion ---------- Post added 04-23-19 at 05:07 AM ---------- Originally posted by garywakeling Have you checked the switches on the lens itself? @garywakeling: The switches on the lens are correct positioned. I am afferaid there must be something wrong with the machinery inside

04-24-2019, 06:13 AM	#10
biz-engineer Pentaxian Join Date: Feb 2015 Photos: Gallery Posts: 12,237	Originally posted by hamidamin I gently bent it back in place and it works now even though it is still not perfectly in place! That's an interesting photograph you shared here. We see some scratch / wear on the mount. This kind of wear happens when attempting to mount connect the lens mount to camera mount with the red dots not well aligned. When the dots are well aligned first, then pressing in and turning the bayonet does not wear mount/contacts.

04-24-2019, 10:41 PM	#11
hamidamin Forum Member Join Date: Feb 2016 Location: Nordfyn Photos: Gallery Posts: 68 Original Poster	Originally posted by biz-engineer That's an interesting photograph you shared here. We see some scratch / wear on the mount. This kind of wear happens when attempting to mount connect the lens mount to camera mount with the red dots not well aligned. When the dots are well aligned first, then pressing in and turning the bayonet does not wear mount/contacts. I am afraid it has happened from time to time. I have been in a rush and was not cautious But I think I have learned the lesson And thank you very much for the good explanation. Regards Hamid