talented butter [deleted] 5:55pm, 1 September 2011
I just bought this lens Samyang 35mm, every time I turn the lens up or down, I heard a "noise" and "movement" in the lens as if something is loose inside the lens. The focus ring is very smooth though, so I'm not sure what's causing this. I wonder is your lens having the same issue?

Or can you confirm if when you move the lens up and down, there is no sound and no moment in the lens at all? If so, my lens might be defective. Thank you in advance.
Flu Popow 7 years ago
I notices this on my first Samyang 35 1.4, too. I sent it back, because the focus ring was broken (it had a play of 0.5cm), I didn't notice this on my new one.
I just tried my lens and there isn't any sound that indicates anything loose inside. Having said so, you can slightly feel and hear what I believe are the optics inside it as you move the lens up and down. I also tried my Canon EF-S 17-55 and it does the same.

Are you sure what you hear and feel isn't just the optics inside? Try to do the same with other lenses you have.
Death777 PRO 7 years ago
Hope it's not to late to discuss this issue.
I bought a Samyang 35mm days ago and also note this noise when shaking the lens. in some case it'll slightly impact the MF if you moving up/down your camera.

Too bad it's bough by my friends in US ( I'm in China) so I don't have a chance to return it. Have to try fix it by myself later. :(
Death777, I would try to compare the noise you refer to with another lens you have. I checked against my Canon EF-S 17-55 and both lenses made the same kind of subtle noise, that is, you can hear and feel the optics inside but you can tell they're not loose.
Death777 PRO 7 years ago
Hi Alsal, I have to say most of my lens didn't have such noise.
they're Canon 24-70 f/2.8, cheap Canon 50 f/1.8, Canon 70-200 f/4, and I don't think it's normal for a MF lens to have such noise.

Moreover, I can confirm the noise is caused by some loose inside the mount. When I put my lens upside and down, I can fell the loose by pushing the tail end glasses.

only good news is it didn't impact the focus a lot and this lens is easy to take apart. Will try my luck when some day I can't bear it.
talented butter [deleted] Posted 7 years ago. Edited by talented butter (member) 7 years ago
I really appreciated for the feed back everyone.

Here is what I did, I returned the first copy back to amazon because it made movement in the first copy. I didn't gave up, I asked amazon to resend me a 2nd copy, but still, it make a movement when I turned the lens up and down (this is for the canon mount). I then asked Nikon users, but all told me there are "no movement" at all. I also have a Rokinon 85MM, and it doesn't make any movement at all. Therefore, I had no choice but to returned the 2nd copy as well.

I also have the EF-S 18-55mm and it does make that movement, but I guess that 's normal for that lens, but for this Rokinon 35mm, I believed it shouldn't make any movement at all (my 2 cents).

Sad to say, but I had to return them. But I have to admit the image is very sharp on this lens and the bokeh is amazing especially in the 35mm range.
Death777 PRO Posted 7 years ago. Edited by Death777 (member) 7 years ago
good news that I've fix the issue by myself. ( almost 3 hours labor including research and finding material).

I can confirm this noise is caused by quality issue and after some handcraft it's now silent like shacking a stone. :)

Please feel free to email/message me if you have same issue and want to fix. xuanjackyyang#gmail.com
talented butter [deleted] Posted 7 years ago. Edited by talented butter (member) 7 years ago
Man you are good! This give me hope in re-ordering it. Can you actually share the details of the caused? I really like to know, since I ordered two copies and both copies had the same issue.
Death777 PRO 6 years ago
I wrote a manual for fixing this issue.
Hope it's useful to everybody and sorry for my poor english.

www.flickr.com/photos/death777/6861364424/in/photostream/
Benoit Leveau PRO 6 years ago
I noticed this noise too, but only on a few occasions.
I thought this might be caused by temperature (one of these times was a very hot day in Singapore). Does it make sense?
Thanks for the manual Death777, I don't think I'll try to open my lens now but I keep the link in case.

Also it does happen once in a while that the focus seems to "jump" at the very end of the course (just before infinity). You can actually see the whole image jumping slightly. Has anyone experienced this? I didn't feel like opening a new thread as it might be related (temperature, etc.).
Death777 PRO 6 years ago
 Benoit:

Hi Benoit,

Actually the noise and focus jump have the same root cause - gap between focusing rail and wheel. Actually focus jumping is the reason that drive me to take it apart.
If you have same issue and annoying a lot, maybe you should do.
Mathias Laustrup 6 years ago
I have this aswell. Though, my Tokina 11-16mm and my Canon 70-200 f/4 L has this aswell. Theyre auto focus lenses though.
Benoit Leveau PRO 6 years ago
Hi Death777,
I noticed your reply just now. Thanks. I'm very bad at DIY so I might take it to a camera repair shop instead if it gets worse.
Benoit Leveau PRO 5 years ago
Just tried it for another issue (my focus ring was stuck after traveling in a bag), and I can't stress enough that you have to be VERY CAREFUL when removing the ring that holds the small ball. When I did it, the ball jumped through the room, and I spent the next 10 minutes to look for it. I was quite lucky to find it as it's so small...
Anyway, I sent the lens to the repair shop (for the 2nd time in 15 months) as I couldn't access the focus ring that way...anyway it was interesting to do it, I'll feel more confident if I need to it later.
And I now know how to temporarily remove the small ball to make the aperture click-less (like the video version of the lens).
studio_POP 5 years ago
Danielskimm 4 years ago
I've just brought a second hand one and it also had a loose sound when moving it up and down. So I've spent the last 5 hours trying to figure out why by disassembling the whole unit and I've found the problem (on my one at least).

The problem is that the front element has a plastic housing that sits under the second element as shown in the internal glass picture.

www.estiasis.com/totalid/lens/samyang/35mm-f14-umc

Now, the plastic housing that holds the very front element is slightly, and i mean really slightly undersized. So basically, the tolerance is whack due to cheap injection molding.

If you want to fix this noise DO AT YOUR OWN RISK!

1. If you look in front of your lens, you'll see the front element and the shroud that covers this front glass. If you look on the edge of this shroud, you should see two holes opposite each other. Now if this is loose, tighten it with a lens spanner (or in my case a compass). After you've tighten down this plastic shroud move it up and down again and see if you hear the same noise. If it does, you'll have to make spacers or shims on the edge and tighten it down so it will apply more pressure on the front element to stop it from moving around

WARNING: If you unscrew the whole shroud, be VERY careful the front element does not drop out. DO NOT move it up and down without the shroud! the elements are free floating, and will fall out if you put it upside down.

This is definitely a manufacturing defeat, the tolerance is out and it seems that the plastic has shrunk/expanded in some cases. But in my case, even though the front and second element was 'loose' and rattling inside the plastic housings i do not think it affects the image quality, my version was and is still tack sharp at f/1.4.

I hold this helps for potential owners with this problem ...
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