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Samyang 85/1.4 Dissasembly (DIY Tutorial)

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Frankman View Drop Down
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Post Options Post Options   Quote Frankman Quote  Post ReplyReply Direct Link To This Post Topic: Samyang 85/1.4 Dissasembly (DIY Tutorial)
    Posted: 10 June 2011 at 09:49
Welcome to another excellent article written by Dragos (DeX). In this tutorial, Dragos walks us through the process of disassembling (and reassembling!) the Samyang 85/1.4 lens. Another valuable resource for us on Dyxum. Many thanks for this tutorial Dragos.

Frank



This should serve as a general guide for disassembling this lens. No actual repairs are made because nothing was broken, I just took the lens apart, cleaned it nicely then put it back together. The tutorial might not show everything from the best angles because the images were initially intended to help me with the reassembly but I thought I'd share.



I had quite a few problems while doing this as it seems I am the first creature on the internet documenting this operation, so I hope this helps someone. I couldn't find any other resources except mount mods for AF confirmation chips.

You may not need to go through all the steps to achieve what you want to do so read through the whole thing and select the info you need.

There are mainly 4 reasons why you would like to do this disassembly (at least partially):
- cleaning the lens and greasing it
- elegantly solve infinity focus problems after changing the mount for an m42 chipped adapter (not tested)
- having a click free aperture, great for movies
- repairs (although I have not yet heard of a Samyang breaking down)

Before starting, a few general remarks:
- do this in a room with little dust
- have a rocket blower and a microfiber cloth at hand
- use only lens grease or heat resistant bike grease (I've used some magenta teflon based grease). If the grease is not heat resistant it will melt from focusing friction and make a big mess in your lens.
- the lens is composed of two groups of glass: The stationary one containing the first element, and the focusing group containing the aperture which moves in order to focus.
- I'm not responsible if you mess up your lens but I'll try to help in case you do.


So the first thing you need to do is take the rubber focus ring off. This is done by inserting a flat srewdriver underneath it and carefully lift and try to push down on the rubber ring so that it slides out on the mount end of the lens.



Once that's done take off the plastic bands that are gently glued on the lens body and you should have this:



(ignore the fact that the mount is missing).
Now what this allows you to do is to set infinity focus. See those two black screws in the silver 0 shaped piece? Those are used to set the lens on infinity focus when it actually points infinity on the scale. If you have infinity focus problems you just need to unscrew these screws, move the ring, rescrew and then check your focus. Repeat until successful. This may happen if you change the mount for a chipped m42 adapter.


Unscrew the 3 screws holding the mount in place, it should fall off easily together with a metal aperture control ring:




The aperture control ring:



When reassembling the lens make sure the aperture control ring is properly aligned (see next image):
- The aperture control pin must fit in betwen the yellow dent of the ring ( marked (1) )
- The small pin from the ring must fit in the C shaped rotating (marked (2) )


You should be left with just a plastic spacer over the rest of the aperture control parts, held in place by 4 screws.




Now you should see the rest of the aperture control assembly, unscrew the 3 screws marked here and gently take out the metal parts and finally the black plastic aperture ring. Be very careful when removing the latter because there's a small metal ball that makes the aperture click and it is easily lost. I have not put my ball back in because I like having a smooth aperture for movies .





Aperture ring with indentations and the tiny ball that makes it click.





I don't think you need to but I also removed the black metal ring with the focus mark on it. It is held in place by 3 small screws, in hindsight I do not recommend its removal as it does not really help with anything, except having to recalibrate the infinity mark.
The focusing group can be disassembled by unscrewing the ring marked on the photo. You have to be careful though because many lenses will fall out, use a blower if you have dust inside then put everything back together.




In order to get in the lens you need to align the focus ring with three screws marked here.

Hold the plastic ring around the front element tight in your hand, then pull upwards until you feel it jam, then rotate it to unscrew the front element assembly from the rest of the body.
You do not want to know how long it took me to understand this step without a service manual

For easy reassembly, screw the front element back in, push on the plastic ring then rotate it a bit to align the focus stop screw with the dent in the plastic ring.





After the separation it should look like this. This is also where you should find and clean dust because the other elements are rather well sealed.



Finally, if you had focus problems like I had (focus isn't smooth, making noises, etc) you need to unscrew the 3 teflon cylinder screws that move the focusing group marked here.

The focusing group will then slide out of the lens tube so you can clean and crease its edges. Do try and remember the position of the focusing group (take the aperture pin vs the yellow C shaped piece as a distance measure, see picture X )



For reassembly, follow the instructions backwards and enjoy your freshly cleaned and greased Samyang 85mm F1.4





-Dragos
*** Sony A850 * A700 * Minolta 5D and other stuff ***
 



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youpii View Drop Down
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Post Options Post Options   Quote youpii Quote  Post ReplyReply Direct Link To This Post Posted: 10 June 2011 at 18:14
Do you think we could hack the aperture lever for automatic control from the camera?
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Micholand View Drop Down
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Post Options Post Options   Quote Micholand Quote  Post ReplyReply Direct Link To This Post Posted: 10 June 2011 at 20:33
Very informative write-up Dragos|DeX. Thanks for the effort!
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DeX View Drop Down
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Post Options Post Options   Quote DeX Quote  Post ReplyReply Direct Link To This Post Posted: 10 June 2011 at 23:03
Thank you, it might serve more in a few years when these things will start needing some maintenance.

@youpii: I don't think such an aperture hack would be feasible as you need to machine quite a few parts and even then you're not sure that the rate at which the samyang closes the aperture is compatible with the rate sony bodies do it. I also see no advantage to let the camera control the aperture, I mostly shoot in A mode anyway :)
Prime guy. Currently in the "Do more with less" phase...
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Josiel View Drop Down
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Post Options Post Options   Quote Josiel Quote  Post ReplyReply Direct Link To This Post Posted: 11 June 2011 at 00:34
Originally posted by Micholand Micholand wrote:

Very informative write-up Dragos|DeX. Thanks for the effort!


+ 1
A700 | A100 | 28-135 | 24-105 | 100-300 APO | 20 2.8 | 28 2 | 50 1.4 | 85 1.4 | 100 2.8M | 200 2.8 APO | TC 2x APO | Sigma 50 2.8M | Sigma 105 2.8M | TC 2x MC7
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NicDaniel View Drop Down
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Post Options Post Options   Quote NicDaniel Quote  Post ReplyReply Direct Link To This Post Posted: 19 September 2012 at 08:17
Hi. i've got dust in the brand new Rokinon 85 1.4 (same as Samyang). I want to disassemble it for cleaning and i have a question for you: if i take off the large lens with the plastic thing (in the picture that says "Clean and grease the surface ...."), can i get to aperture blades and lens next to them. I've got large dust spec right on the lens next to aperture blades
Thanks

PS got your answer on Flickr. Thanks

Edited by NicDaniel - 19 September 2012 at 10:02
 



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pprocter View Drop Down
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Post Options Post Options   Quote pprocter Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2015 at 17:54
I know it's been a while since you posted this, but it's still helping people like me! I got some water into the lens during a rain storm (don't ask how wet I was!!) and your post allowed me to clean the inside lens surface without spending $$$ on a repair fee. I NEVER would have figured that 'pull, then turn' part out without a bunch of luck.

Thanks, again!
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altanico View Drop Down
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Post Options Post Options   Quote altanico Quote  Post ReplyReply Direct Link To This Post Posted: 27 April 2015 at 12:26
Very useful. i think i have the same problems (focus non very smooth).
i'll try but i have to admit i'm a bit scared
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nyatan View Drop Down
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Post Options Post Options   Quote nyatan Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2016 at 05:19
I cleaned a fungus spot inside the front element of my 85mm yesterday by following your guide. The front group can be screwed apart. I can thank you enough.
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Fivepin View Drop Down
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Post Options Post Options   Quote Fivepin Quote  Post ReplyReply Direct Link To This Post Posted: 01 December 2017 at 21:47
A huge thank you for posting this. I had to take my new (ebay scumbag seller deal) lens apart to try and salvage it. Sold as new...showed up with a smashed filter on the end of it...no hood and a focus ring that would not turn...Using this guide...I fixed it.

So THANK YOU
G.R.
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Post Options Post Options   Quote Dr. Harout Quote  Post ReplyReply Direct Link To This Post Posted: 02 December 2017 at 08:05
7rII + Sony, Tamron, Minolta, Rokinon, Zeiss and M42 lenses
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