FA*85mm F1.4 suddenly cannot focus to infinity

**felixkh** · 05-26-2015, 01:55 AM

The lens was working fine the last time I used it but today it could not focus to infinity. Using the K3 with the lens. Anyone encounter this issue before?

Adam · 05-26-2015, 03:25 AM

Will the focusing ring physically not turn to infinity, or does it get jammed? Could be broken gearing inside the lens if that's the case. Happened to my 43mm, believe it or not, after just a couple of outings.

If that's not it, then try removing and re-mounting the lens, cleaning all contacts, cleaning the mirror box, and performing AF adjustments.

tabl10s · 05-26-2015, 06:42 AM

Originally posted by felixkh

The lens was working fine the last time I used it but today it could not focus to infinity. Using the K3 with the lens. Anyone encounter this issue before?

At least you have a manual version to play with. How do they compare?

**felixkh** · 05-26-2015, 06:47 AM

I cannot go past infinity on the Silver K3 and I have adjusted the AF adjustment to -10. But on my son's Black K3, I could get it to work to infinity. weird.

It's going to visit the service centre tomorrow.

---------- Post added 05-26-2015 at 09:55 PM ----------

It will focus up to just before the infinity sign and I then cannot press the shutter button tp take a photo. On my son's Black K3, it goes to infinity and fires.

**felixkh** · 05-27-2015, 01:31 AM

Seems it's the lens so it's gone for servicing. Hopefully it can be fixed.

**felixkh** · 05-28-2015, 07:41 PM

Update!

It seems the lens rear group was loose and that was the reason that it could not focus to infinity. It's been fixed by the service guy and will collect it when I am free.

05-26-2015, 01:55 AM	#1
felixkh Site Supporter Join Date: Nov 2008 Location: Singapore Photos: Gallery Posts: 1,201	*FA85mm F1.4 suddenly cannot focus to infinity** The lens was working fine the last time I used it but today it could not focus to infinity. Using the K3 with the lens. Anyone encounter this issue before?

05-26-2015, 03:25 AM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	Will the focusing ring physically not turn to infinity, or does it get jammed? Could be broken gearing inside the lens if that's the case. Happened to my 43mm, believe it or not, after just a couple of outings. If that's not it, then try removing and re-mounting the lens, cleaning all contacts, cleaning the mirror box, and performing AF adjustments. 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:

05-27-2015, 01:31 AM	#5
felixkh Site Supporter Join Date: Nov 2008 Location: Singapore Photos: Gallery Posts: 1,201 Original Poster	Seems it's the lens so it's gone for servicing. Hopefully it can be fixed. Last edited by felixkh; 05-27-2015 at 02:30 AM.

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05-26-2015, 06:42 AM	#3
tabl10s Veteran Member Join Date: Jun 2011 Location: Sacramento(formerly from B'Ham, England). Posts: 1,424	Originally posted by felixkh The lens was working fine the last time I used it but today it could not focus to infinity. Using the K3 with the lens. Anyone encounter this issue before? At least you have a manual version to play with. How do they compare?

05-26-2015, 06:47 AM	#4
felixkh Site Supporter Join Date: Nov 2008 Location: Singapore Photos: Gallery Posts: 1,201 Original Poster	I cannot go past infinity on the Silver K3 and I have adjusted the AF adjustment to -10. But on my son's Black K3, I could get it to work to infinity. weird. It's going to visit the service centre tomorrow. ---------- Post added 05-26-2015 at 09:55 PM ---------- It will focus up to just before the infinity sign and I then cannot press the shutter button tp take a photo. On my son's Black K3, it goes to infinity and fires.

05-28-2015, 07:41 PM	#6
felixkh Site Supporter Join Date: Nov 2008 Location: Singapore Photos: Gallery Posts: 1,201 Original Poster	Update! It seems the lens rear group was loose and that was the reason that it could not focus to infinity. It's been fixed by the service guy and will collect it when I am free.

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