Tamron 28-75 after lens clean is not getting detected!

ajaya · 08-06-2020, 02:49 AM

Hi,

I got my tamron 28-75mm cleaned for fungus but after cleaning its not detecting in my KR, i tried below its not working. can anyone suggest me what should i try to get it work ?

1) cleaning camera mount and lens rear mount
2) tried to change the A ring to different value and use the lens in MF mode
3) try to switch to pentax lens and try back this lens.

Attached Images

dbs · 08-06-2020, 02:57 AM

Hi.

Check to see in the menus if the " using aperture ring " is permitted.

Dave

ajaya · 08-06-2020, 04:24 AM

Originally posted by dbs

Hi.

Check to see in the menus if the " using aperture ring " is permitted.

Dave

Tried, still same issue.

enoeske · 08-06-2020, 07:31 AM

Rub a pencil eraser on the lens' electrical contacts

stevebrot · 08-06-2020, 07:34 AM

Originally posted by ajaya

I got my tamron 28-75mm cleaned for fungus but after cleaning its not detecting in my KR, i tried below its not working. can anyone suggest me what should i try to get it work ?

Have you talked to the person that did the cleaning? If it worked before and did not work after, that might be your first line of inquiry.

Steve

ajaya · 08-06-2020, 08:07 AM

Originally posted by stevebrot

Have you talked to the person that did the cleaning? If it worked before and did not work after, that might be your first line of inquiry.

Steve

Yes,i need to visit the center over weekend and check with them.

---------- Post added 08-06-2020 at 09:09 AM ----------

Originally posted by enoeske

Rub a pencil eraser on the lens' electrical contacts

Hey thanks, let me try this unique solution, hope it works !

---------- Post added 08-06-2020 at 09:12 AM ----------

Just for information, the Tamron 28-75mm lens is AF lens.

dbs · 08-06-2020, 05:22 PM

Sounds like they have not put it back together correctly.

Could you add a photo of the mount , maybe someone can see a difference.

ajaya · 08-17-2020, 06:11 AM

Originally posted by dbs

Sounds like they have not put it back together correctly.

Could you add a photo of the mount , maybe someone can see a difference.

Hi All, Please find the attached image of the lens mount section. I just tried today again after using pentax lens for a week and now i could see the Autofocus is working on the lens but F number i am not able change and still flashing ! so please let me know what could be the issue.

Thanks

**Lowell Goudge** · 08-17-2020, 07:30 AM

i dont see anywhere to check the lens / aperture is in the A position? this lens does have an aperture ring, it will show F-- if not in the A position

stevebrot · 08-17-2020, 11:41 AM - **1 Like**

Originally posted by ajaya

Hi All, Please find the attached image of the lens mount section. I just tried today again after using pentax lens for a week and now i could see the Autofocus is working on the lens but F number i am not able change and still flashing ! so please let me know what could be the issue.

Thanks

Did you ever talk to the shop that did the repair?

The short answer is that the contact fifth from the left, next to the white patch, is not being detected as having electrical continuity with the mount. This should always be the case when the aperture ring is in the "A" position and should never be the case when the ring is in other than the "A" position.

Steve

ajaya · 08-18-2020, 03:31 AM

Originally posted by Lowell Goudge

i dont see anywhere to check the lens / aperture is in the A position? this lens does have an aperture ring, it will show F-- if not in the A position

Yes it is at A postion

---------- Post added 08-18-2020 at 04:44 AM ----------

Originally posted by stevebrot

Did you ever talk to the shop that did the repair?

The short answer is that the contact fifth from the left, next to the white patch, is not being detected as having electrical continuity with the mount. This should always be the case when the aperture ring is in the "A" position and should never be the case when the ring is in other than the "A" position.

Steve

Thanks Steve, Shop is closed after i collected my lens due to COVID situation. Do you think is there anyway where i can cleanup the contact which you mentioned ?

**Lowell Goudge** · 08-18-2020, 04:22 AM

All the contacts can be cleaned with isopropyl alcohol. Use a quip or soft cloth. Also move the lens in and out of the A position a few times, maybe the internal contact is dirty. This could be the case if it hasn’t moved in a while

stevebrot · 08-18-2020, 09:00 AM

Originally posted by ajaya

Thanks Steve, Shop is closed after i collected my lens due to COVID situation. Do you think is there anyway where i can cleanup the contact which you mentioned ?

I doubt this is a matter of cleaning. Instead, I suspect the service attempt resulted in a broken solder joint or wiring connection under the mount on the lens.

Steve

stevebrot · 08-18-2020, 09:01 AM

Originally posted by Lowell Goudge

All the contacts can be cleaned with isopropyl alcohol. Use a quip or soft cloth. Also move the lens in and out of the A position a few times, maybe the internal contact is dirty. This could be the case if it hasn’t moved in a while

The lens was recently CLA'd (see original post) and the supplied photos show a clean mount.

Steve

stevebrot · 08-18-2020, 09:05 AM

Originally posted by ajaya

Hi All, Please find the attached image of the lens mount section.

I just took a closer look at the supplied photo. Is the mount tang at left bent? If so, that might be the source of your problem if the lens is not seated flat onto the camera.

Steve

08-06-2020, 02:49 AM	#1
ajaya Senior Member Join Date: May 2010 Location: Bangalore Photos: Gallery \| Albums Posts: 150	Tamron 28-75 after lens clean is not getting detected! Hi, I got my tamron 28-75mm cleaned for fungus but after cleaning its not detecting in my KR, i tried below its not working. can anyone suggest me what should i try to get it work ? 1) cleaning camera mount and lens rear mount 2) tried to change the A ring to different value and use the lens in MF mode 3) try to switch to pentax lens and try back this lens. Attached Images

08-17-2020, 06:11 AM	#8
ajaya Senior Member Join Date: May 2010 Location: Bangalore Photos: Gallery \| Albums Posts: 150 Original Poster	Originally posted by dbs Sounds like they have not put it back together correctly. Could you add a photo of the mount , maybe someone can see a difference. Hi All, Please find the attached image of the lens mount section. I just tried today again after using pentax lens for a week and now i could see the Autofocus is working on the lens but F number i am not able change and still flashing ! so please let me know what could be the issue. Thanks Attached Images

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08-06-2020, 02:57 AM	#2
dbs Pentaxian Join Date: Jun 2010 Location: Clare Valley S A Photos: Albums Posts: 7,568	Hi. Check to see in the menus if the " using aperture ring " is permitted. Dave

08-06-2020, 04:24 AM	#3
ajaya Senior Member Join Date: May 2010 Location: Bangalore Photos: Gallery \| Albums Posts: 150 Original Poster	Originally posted by dbs Hi. Check to see in the menus if the " using aperture ring " is permitted. Dave Tried, still same issue.

08-06-2020, 07:31 AM	#4
enoeske Veteran Member Join Date: Jul 2009 Location: Surprise, Az Photos: Gallery Posts: 2,136	Rub a pencil eraser on the lens' electrical contacts

08-06-2020, 07:34 AM	#5
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by ajaya I got my tamron 28-75mm cleaned for fungus but after cleaning its not detecting in my KR, i tried below its not working. can anyone suggest me what should i try to get it work ? Have you talked to the person that did the cleaning? If it worked before and did not work after, that might be your first line of inquiry. Steve

08-06-2020, 08:07 AM	#6
ajaya Senior Member Join Date: May 2010 Location: Bangalore Photos: Gallery \| Albums Posts: 150 Original Poster	Originally posted by stevebrot Have you talked to the person that did the cleaning? If it worked before and did not work after, that might be your first line of inquiry. Steve Yes,i need to visit the center over weekend and check with them. ---------- Post added 08-06-2020 at 09:09 AM ---------- Originally posted by enoeske Rub a pencil eraser on the lens' electrical contacts Hey thanks, let me try this unique solution, hope it works ! ---------- Post added 08-06-2020 at 09:12 AM ---------- Just for information, the Tamron 28-75mm lens is AF lens.

08-06-2020, 05:22 PM	#7
dbs Pentaxian Join Date: Jun 2010 Location: Clare Valley S A Photos: Albums Posts: 7,568	Sounds like they have not put it back together correctly. Could you add a photo of the mount , maybe someone can see a difference.

08-17-2020, 07:30 AM	#9
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,892	i dont see anywhere to check the lens / aperture is in the A position? this lens does have an aperture ring, it will show F-- if not in the A position

08-17-2020, 11:41 AM - 1 Like	#10
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by ajaya Hi All, Please find the attached image of the lens mount section. I just tried today again after using pentax lens for a week and now i could see the Autofocus is working on the lens but F number i am not able change and still flashing ! so please let me know what could be the issue. Thanks Did you ever talk to the shop that did the repair? The short answer is that the contact fifth from the left, next to the white patch, is not being detected as having electrical continuity with the mount. This should always be the case when the aperture ring is in the "A" position and should never be the case when the ring is in other than the "A" position. Steve

08-18-2020, 03:31 AM	#11
ajaya Senior Member Join Date: May 2010 Location: Bangalore Photos: Gallery \| Albums Posts: 150 Original Poster	Originally posted by Lowell Goudge i dont see anywhere to check the lens / aperture is in the A position? this lens does have an aperture ring, it will show F-- if not in the A position Yes it is at A postion ---------- Post added 08-18-2020 at 04:44 AM ---------- Originally posted by stevebrot Did you ever talk to the shop that did the repair? The short answer is that the contact fifth from the left, next to the white patch, is not being detected as having electrical continuity with the mount. This should always be the case when the aperture ring is in the "A" position and should never be the case when the ring is in other than the "A" position. Steve Thanks Steve, Shop is closed after i collected my lens due to COVID situation. Do you think is there anyway where i can cleanup the contact which you mentioned ?

08-18-2020, 04:22 AM	#12
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,892	All the contacts can be cleaned with isopropyl alcohol. Use a quip or soft cloth. Also move the lens in and out of the A position a few times, maybe the internal contact is dirty. This could be the case if it hasn’t moved in a while

08-18-2020, 09:00 AM	#13
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by ajaya Thanks Steve, Shop is closed after i collected my lens due to COVID situation. Do you think is there anyway where i can cleanup the contact which you mentioned ? I doubt this is a matter of cleaning. Instead, I suspect the service attempt resulted in a broken solder joint or wiring connection under the mount on the lens. Steve

08-18-2020, 09:01 AM	#14
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by Lowell Goudge All the contacts can be cleaned with isopropyl alcohol. Use a quip or soft cloth. Also move the lens in and out of the A position a few times, maybe the internal contact is dirty. This could be the case if it hasn’t moved in a while The lens was recently CLA'd (see original post) and the supplied photos show a clean mount. Steve

08-18-2020, 09:05 AM	#15
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by ajaya Hi All, Please find the attached image of the lens mount section. I just took a closer look at the supplied photo. Is the mount tang at left bent? If so, that might be the source of your problem if the lens is not seated flat onto the camera. Steve