smc pentax-f 2.8 macro

kevinWE · 08-11-2019, 07:49 PM

My lens was working fine in AF mode. Tried taking a few shots today and infinity focus did nothing but hunt. I tried everything I could think of to correct the problem but nothing worked. As of now it works in MF only (which is fine) but it would be nice to figure out this AF problem.

**ismaelg** · 08-11-2019, 07:54 PM

Hello,

What camera are you using? When manual focusing, do you get focus confirmation? Have you tried in another camera? You mention at infinity. Does it work at close range?

Thanks,

kevinWE · 08-11-2019, 08:00 PM

Originally posted by ismaelg

Hello,

What camera are you using? When manual focusing, do you get focus confirmation? Have you tried in another camera? You mention at infinity. Does it work at close range?

Thanks,

it was working fine until today. I have it on my K10D, and it was focusing like it should, then it just stopped and did nothing but hunt. Manual focus works proper, no issues at all.

Not a Number · 08-11-2019, 08:23 PM

Does the lens have an aperture ring? Set to "A"?

**jatrax** · 08-11-2019, 08:58 PM

Try cleaning the contacts on both the camera and lens.

**brightseal** · 08-11-2019, 09:14 PM

Originally posted by kevinWE

smc pentax-f 2.8 macro

Which f 2.8 macro?

pschlute · 08-12-2019, 01:22 AM

Originally posted by kevinWE

it was working fine until today. I have it on my K10D, and it was focusing like it should, then it just stopped and did nothing but hunt. Manual focus works proper, no issues at all.

Select "sensor cleaning" from the menu. This will lift the mirror and expose the sensor. Use a rocket blower to knock any dust off the AF module.

The AF module is located at the bottom of the mirror box, behind the mirror. That is why you need the mirror up to use the blower.

Try the lens again.

kevinWE · 08-12-2019, 02:55 AM

Originally posted by brightseal

Which f 2.8 macro?

100mm macro

---------- Post added 08-12-19 at 02:57 AM ----------

Originally posted by jatrax

Try cleaning the contacts on both the camera and lens.

This has been tried multiple times, but thank you for the response.

---------- Post added 08-12-19 at 02:59 AM ----------

Originally posted by pschlute

Select "sensor cleaning" from the menu. This will lift the mirror and expose the sensor. Use a rocket blower to knock any dust off the AF module.

The AF module is located at the bottom of the mirror box, behind the mirror. That is why you need the mirror up to use the blower.

Try the lens again.

I will try this, but I would assume that my other AF lenses wouldn't function proper if the AF module was dirty. I tried my old DA and it functions like a champ.

---------- Post added 08-12-19 at 03:01 AM ----------

Originally posted by Not a Number

Does the lens have an aperture ring? Set to "A"?

No, the lens is set correctly and was working fine, then it just stopped auto focusing and continued to hunt and hunt and hunt.

---------- Post added 08-12-19 at 03:14 AM ----------

OK, I just noticed something that the lens appears to be doing. My manual focus is only working in the macro mode, I cannot focus out to infinity in manual or AF. I seem to be stuck in the macro mode and cant set the lens back to full focus. The AF is working up-close also. Any ideas on how to fix this problem?

tom1803 · 08-12-2019, 04:02 AM - **2 Likes**

You probably set the focus limiter by accident.

Change the Focus Range setting to "Full".

kevinWE · 08-12-2019, 03:21 PM

Originally posted by tom1803

You probably set the focus limiter by accident.

Change the Focus Range setting to "Full".

The focus range is on full, so it's not the limiter.

pschlute · 08-12-2019, 03:52 PM

Originally posted by kevinWE

The focus range is on full, so it's not the limiter.

You are assuming the Limiter switch is working correctly.

kevinWE · 08-12-2019, 06:09 PM

Originally posted by pschlute

You are assuming the Limiter switch is working correctly.

I am not assuming anything at this point, other than this lens may need to see a tech.

Any advice on who I could send this lens too? I was thinking of calling Precision Camera http://www.precisioncamera.com/professional-camera-repair.html

**monochrome** · 08-12-2019, 09:05 PM - **1 Like**

Originally posted by kevinWE

I am not assuming anything at this point, other than this lens may need to see a tech.

Any advice on who I could send this lens too? I was thinking of calling Precision Camera Professional Camera Repair | Cleaning | Calibration

email Eric Hendrickson Home-Pentaxs (email addy at Link). Ask if he can service the lens. Precision probably won’t service an F-series lens. They’re 30 years old.

kevinWE · 08-13-2019, 03:24 AM

Originally posted by monochrome

email Eric Hendrickson Home-Pentaxs (email addy at Link). Ask if he can service the lens. Precision probably won’t service an F-series lens. They’re 30 years old.

Thank you.

kevinWE · 08-13-2019, 09:39 AM

Well, I contacted Eric and he replied that he can not fix my lens. :-(

08-11-2019, 07:49 PM	#1
kevinWE Veteran Member Join Date: Aug 2017 Location: Illinois, USA Posts: 497	smc pentax-f 2.8 macro My lens was working fine in AF mode. Tried taking a few shots today and infinity focus did nothing but hunt. I tried everything I could think of to correct the problem but nothing worked. As of now it works in MF only (which is fine) but it would be nice to figure out this AF problem.

08-12-2019, 06:09 PM	#12
kevinWE Veteran Member Join Date: Aug 2017 Location: Illinois, USA Posts: 497 Original Poster	Originally posted by pschlute You are assuming the Limiter switch is working correctly. I am not assuming anything at this point, other than this lens may need to see a tech. Any advice on who I could send this lens too? I was thinking of calling Precision Camera http://www.precisioncamera.com/professional-camera-repair.html Last edited by kevinWE; 08-12-2019 at 06:27 PM.

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08-11-2019, 07:54 PM	#2
ismaelg Loyal Site Supporter Join Date: Apr 2009 Location: Puerto Rico Photos: Gallery Posts: 2,681	Hello, What camera are you using? When manual focusing, do you get focus confirmation? Have you tried in another camera? You mention at infinity. Does it work at close range? Thanks,

08-11-2019, 08:00 PM	#3
kevinWE Veteran Member Join Date: Aug 2017 Location: Illinois, USA Posts: 497 Original Poster	Originally posted by ismaelg Hello, What camera are you using? When manual focusing, do you get focus confirmation? Have you tried in another camera? You mention at infinity. Does it work at close range? Thanks, it was working fine until today. I have it on my K10D, and it was focusing like it should, then it just stopped and did nothing but hunt. Manual focus works proper, no issues at all.

08-11-2019, 08:23 PM	#4
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	Does the lens have an aperture ring? Set to "A"?

08-11-2019, 08:58 PM	#5
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Try cleaning the contacts on both the camera and lens.

08-11-2019, 09:14 PM	#6
brightseal Site Supporter Join Date: Dec 2015 Photos: Albums Posts: 629	Originally posted by kevinWE smc pentax-f 2.8 macro Which f 2.8 macro?

08-12-2019, 01:22 AM	#7
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,202	Originally posted by kevinWE it was working fine until today. I have it on my K10D, and it was focusing like it should, then it just stopped and did nothing but hunt. Manual focus works proper, no issues at all. Select "sensor cleaning" from the menu. This will lift the mirror and expose the sensor. Use a rocket blower to knock any dust off the AF module. The AF module is located at the bottom of the mirror box, behind the mirror. That is why you need the mirror up to use the blower. Try the lens again.

08-12-2019, 02:55 AM	#8
kevinWE Veteran Member Join Date: Aug 2017 Location: Illinois, USA Posts: 497 Original Poster	Originally posted by brightseal Which f 2.8 macro? 100mm macro ---------- Post added 08-12-19 at 02:57 AM ---------- Originally posted by jatrax Try cleaning the contacts on both the camera and lens. This has been tried multiple times, but thank you for the response. ---------- Post added 08-12-19 at 02:59 AM ---------- Originally posted by pschlute Select "sensor cleaning" from the menu. This will lift the mirror and expose the sensor. Use a rocket blower to knock any dust off the AF module. The AF module is located at the bottom of the mirror box, behind the mirror. That is why you need the mirror up to use the blower. Try the lens again. I will try this, but I would assume that my other AF lenses wouldn't function proper if the AF module was dirty. I tried my old DA and it functions like a champ. ---------- Post added 08-12-19 at 03:01 AM ---------- Originally posted by Not a Number Does the lens have an aperture ring? Set to "A"? No, the lens is set correctly and was working fine, then it just stopped auto focusing and continued to hunt and hunt and hunt. ---------- Post added 08-12-19 at 03:14 AM ---------- OK, I just noticed something that the lens appears to be doing. My manual focus is only working in the macro mode, I cannot focus out to infinity in manual or AF. I seem to be stuck in the macro mode and cant set the lens back to full focus. The AF is working up-close also. Any ideas on how to fix this problem?

08-12-2019, 04:02 AM - 2 Likes	#9
tom1803 Veteran Member Join Date: Feb 2010 Location: Kokubunji, Tokyo Photos: Gallery Posts: 465	You probably set the focus limiter by accident. Change the Focus Range setting to "Full".

08-12-2019, 03:21 PM	#10
kevinWE Veteran Member Join Date: Aug 2017 Location: Illinois, USA Posts: 497 Original Poster	Originally posted by tom1803 You probably set the focus limiter by accident. Change the Focus Range setting to "Full". The focus range is on full, so it's not the limiter.

08-12-2019, 03:52 PM	#11
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,202	Originally posted by kevinWE The focus range is on full, so it's not the limiter. You are assuming the Limiter switch is working correctly.

08-12-2019, 09:05 PM - 1 Like	#13
monochrome Loyal Site Supporter Join Date: Mar 2008 Location: Working From Home Photos: Gallery \| Albums Posts: 26,276	Originally posted by kevinWE I am not assuming anything at this point, other than this lens may need to see a tech. Any advice on who I could send this lens too? I was thinking of calling Precision Camera Professional Camera Repair \| Cleaning \| Calibration email Eric Hendrickson Home-Pentaxs (email addy at Link). Ask if he can service the lens. Precision probably won’t service an F-series lens. They’re 30 years old.

08-13-2019, 03:24 AM	#14
kevinWE Veteran Member Join Date: Aug 2017 Location: Illinois, USA Posts: 497 Original Poster	Originally posted by monochrome email Eric Hendrickson Home-Pentaxs (email addy at Link). Ask if he can service the lens. Precision probably won’t service an F-series lens. They’re 30 years old. Thank you.

08-13-2019, 09:39 AM	#15
kevinWE Veteran Member Join Date: Aug 2017 Location: Illinois, USA Posts: 497 Original Poster	Well, I contacted Eric and he replied that he can not fix my lens. :-(