Pentax D FA 100 and possible focusring problem?

fotofinken · 09-28-2016, 01:12 AM

Hello fellow pentaxians!

Bought my costly DFA 100 WR macro about a month ago, and noticed right away a sort of low "mechanical" sound when twisting the focusring a bit rapidly to one side (to left)....like the sound of moving gears. It doesnt matter if the lens is on or off camera. Ill guess its the screwdrive gears, and its perhaps normal, but none of my other lenses make that sound.
Anyway everything works perfect so I didtnt think much about it at that moment....focus ring is smooth to operate, and autofocus works as expected
Then I read in the lens reviews about a lens which had focusring problem, and I started to wonder if my lens is some sort of fault aswell.

Can anyone with the same lens confirm if their lens has this gear twisting sound?

Last edited by fotofinken; 09-28-2016 at 02:13 AM.

Adam · 09-28-2016, 01:33 AM

The quick shift mechanism makes a faint sound, but it shouldn't be particularly loud. Could you post a video maybe?

fotofinken · 09-28-2016, 02:11 AM

Thanks for quick reply! Here is a short video with the sound, and as you can hopefully hear, its not particularly loud. IMG_6899_converted.avi

Even posted the video to youtube

Youtu.be

Charles Hutcheon · 09-28-2016, 02:40 AM

I've noticed the same on mine but it has not seemed to affect it

**BigMackCam** · 09-28-2016, 02:45 AM

Originally posted by fotofinken

Thanks for quick reply! Here is a short video with the sound, and as you can hopefully hear, its not particularly loud.

That's perfectly normal. Mine does the same (slightly higher pitched sound, but essentially the same)

fotofinken · 09-28-2016, 03:05 AM

Thanks guys!

Na Horuk · 09-28-2016, 03:08 AM

Just checked mine, its the same. I never really noticed it before. I guess its because its not a fully plastic lens like the DA L 18-55mm and because it has the QS mechanism.

09-28-2016, 01:12 AM	#1
fotofinken New Member Join Date: Sep 2016 Posts: 23	Pentax D FA 100 and possible focusring problem? Hello fellow pentaxians! Bought my costly DFA 100 WR macro about a month ago, and noticed right away a sort of low "mechanical" sound when twisting the focusring a bit rapidly to one side (to left)....like the sound of moving gears. It doesnt matter if the lens is on or off camera. Ill guess its the screwdrive gears, and its perhaps normal, but none of my other lenses make that sound. Anyway everything works perfect so I didtnt think much about it at that moment....focus ring is smooth to operate, and autofocus works as expected Then I read in the lens reviews about a lens which had focusring problem, and I started to wonder if my lens is some sort of fault aswell. Can anyone with the same lens confirm if their lens has this gear twisting sound? Last edited by fotofinken; 09-28-2016 at 02:13 AM.

09-28-2016, 01:33 AM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	The quick shift mechanism makes a faint sound, but it shouldn't be particularly loud. Could you post a video maybe? 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:

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09-28-2016, 02:40 AM	#4
Charles Hutcheon New Member Join Date: Jun 2016 Posts: 5	I've noticed the same on mine but it has not seemed to affect it

09-28-2016, 02:45 AM	#5
BigMackCam Digitiser of Film Join Date: Mar 2010 Location: North East of England Posts: 20,670	Originally posted by fotofinken Thanks for quick reply! Here is a short video with the sound, and as you can hopefully hear, its not particularly loud. That's perfectly normal. Mine does the same (slightly higher pitched sound, but essentially the same)

09-28-2016, 03:05 AM	#6
fotofinken New Member Join Date: Sep 2016 Posts: 23 Original Poster	Thanks guys!

09-28-2016, 03:08 AM	#7
Na Horuk Veteran Member Join Date: Feb 2012 Location: Slovenia, probably Photos: Gallery \| Albums Posts: 11,186	Just checked mine, its the same. I never really noticed it before. I guess its because its not a fully plastic lens like the DA L 18-55mm and because it has the QS mechanism.