Wierd Samyang 14mm F2.8 ED AS IF UMC problem

Markovo · 04-18-2018, 11:03 PM

So, I have this lens and it has been perfect since I got it about an year ago. Using it on K-1 has been a pleasure, until today...
The focus has "gone". Normally I keep it at infinity as it is focused perfectly for landscape. Rarely I move the focus ring back 1 or 2 mm for closer objects in the distance. Today I was out for a walk and I noticed that the focus at infinity is not there anymore. It was as if the focus ring is set at 10m and that is the maximum. The lens sits tight in my drawer when it's not used and it has never been hit or dropped. It literally changed itself over night...

Any thoughts will be appreciated?

**kiwi_jono** · 04-19-2018, 12:46 AM

Possibly the focus ring screws have slipped? I believe its fairly easy to adjust - I will probably have to adjust mine when I finally get one back (it was decentered out of the box).

DeadJohn · 04-19-2018, 09:17 AM

Try recalibrating your focus ring. Some lenses were poorly calibrated from the factory and didn't get the full focus range. Maybe your lens was originally okay but the screws loosened over time?

This video shows how I adjusted my lens. Calibrate the focus ring of the Samyang 14mm F2.8 | DSLR Astrophotography

vonBaloney · 04-19-2018, 09:29 AM

Unmount/mount if you haven't -- mine fits a bit tight, maybe mismounted somehow? Also try other lenses and make sure your body hasn't gone wonky or you have moved the eyepiece adjustment. If it is the lens, the ring is usually mis-calibrated from the factory -- maybe it was loose and just moved. Fairly easy adjustment if that's the case.

Markovo · 04-19-2018, 09:42 AM

Body is perfect (I have tried other lenses), so is the eyepiece (I have used LV to confirm the focus problem). That leaves the "screws are loosened" thing... I will try to calibrate according to the video and post the results. Greetings!

Markovo · 04-21-2018, 06:15 AM - **1 Like**

Following the videos over YouTube, I think I managed to fix my lens. I've done some test and it all seems good for now. Lets hope it stays that way!

Greetings from Bulgaria!

Markovo · 04-24-2018, 09:39 AM

Well, the problem is nowhere near to a "solved" state. It appears that the focus is not even there at any point. No matter where I turn the focus ring, there is no focus...

stevebrot · 04-24-2018, 09:52 AM

Originally posted by Markovo

Well, the problem is nowhere near to a "solved" state. It appears that the focus is not even there at any point. No matter where I turn the focus ring, there is no focus...

If the lens is still under warranty, send it in for repair/replace. What you describe is something out of place internally.

Steve

Markovo · 04-24-2018, 12:31 PM

Sadly, that's my only option... Thanks for the replays. may the focus be with you Pentaxians!

04-18-2018, 11:03 PM	#1
Markovo Senior Member Join Date: Jul 2014 Location: Bulgaria Posts: 149	Wierd Samyang 14mm F2.8 ED AS IF UMC problem So, I have this lens and it has been perfect since I got it about an year ago. Using it on K-1 has been a pleasure, until today... The focus has "gone". Normally I keep it at infinity as it is focused perfectly for landscape. Rarely I move the focus ring back 1 or 2 mm for closer objects in the distance. Today I was out for a walk and I noticed that the focus at infinity is not there anymore. It was as if the focus ring is set at 10m and that is the maximum. The lens sits tight in my drawer when it's not used and it has never been hit or dropped. It literally changed itself over night... Any thoughts will be appreciated?

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04-19-2018, 12:46 AM	#2
kiwi_jono Loyal Site Supporter Join Date: Dec 2009 Location: Christchurch, New Zealand Photos: Gallery \| Albums Posts: 2,437	Possibly the focus ring screws have slipped? I believe its fairly easy to adjust - I will probably have to adjust mine when I finally get one back (it was decentered out of the box).

04-19-2018, 09:17 AM	#3
DeadJohn Pentaxian Join Date: Jan 2011 Location: New York Posts: 4,833	Try recalibrating your focus ring. Some lenses were poorly calibrated from the factory and didn't get the full focus range. Maybe your lens was originally okay but the screws loosened over time? This video shows how I adjusted my lens. Calibrate the focus ring of the Samyang 14mm F2.8 \| DSLR Astrophotography

04-19-2018, 09:29 AM	#4
vonBaloney Pentaxian Join Date: Oct 2011 Location: Albuquerque, NM Posts: 6,029	Unmount/mount if you haven't -- mine fits a bit tight, maybe mismounted somehow? Also try other lenses and make sure your body hasn't gone wonky or you have moved the eyepiece adjustment. If it is the lens, the ring is usually mis-calibrated from the factory -- maybe it was loose and just moved. Fairly easy adjustment if that's the case.

04-19-2018, 09:42 AM	#5
Markovo Senior Member Join Date: Jul 2014 Location: Bulgaria Posts: 149 Original Poster	Body is perfect (I have tried other lenses), so is the eyepiece (I have used LV to confirm the focus problem). That leaves the "screws are loosened" thing... I will try to calibrate according to the video and post the results. Greetings!

04-21-2018, 06:15 AM - 1 Like	#6
Markovo Senior Member Join Date: Jul 2014 Location: Bulgaria Posts: 149 Original Poster	Following the videos over YouTube, I think I managed to fix my lens. I've done some test and it all seems good for now. Lets hope it stays that way! Greetings from Bulgaria!

04-24-2018, 09:39 AM	#7
Markovo Senior Member Join Date: Jul 2014 Location: Bulgaria Posts: 149 Original Poster	Well, the problem is nowhere near to a "solved" state. It appears that the focus is not even there at any point. No matter where I turn the focus ring, there is no focus...

04-24-2018, 09:52 AM	#8
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by Markovo Well, the problem is nowhere near to a "solved" state. It appears that the focus is not even there at any point. No matter where I turn the focus ring, there is no focus... If the lens is still under warranty, send it in for repair/replace. What you describe is something out of place internally. Steve

04-24-2018, 12:31 PM	#9
Markovo Senior Member Join Date: Jul 2014 Location: Bulgaria Posts: 149 Original Poster	Sadly, that's my only option... Thanks for the replays. may the focus be with you Pentaxians!