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Archive 2012 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (...
  
 
wfrank
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p.1 #1 · p.1 #1 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


Rokkor 58/1.2 is a magic lens by all standards. It offers medium format look (or better) on FF. Now I've had mine for a year, but due to a Zeiss coma I have used it too little. I wanted the oldest version, radioactive and yellow and finally found a copy for 300€. Mount was converted to EOS/EF but I soon find out it did not reach infinity on my 5D2. Mirror hung and while evaluating what was wrong I also found out that the mirror box stopped the rear element from going back-enough to enable infinity. I may have bought it for short distances and stitches, but it was disappointing still. Mine reached perhaps 5 meters or so.

While smoking Zeiss I sometimes stumbled across images at infinity on FF. Almost always a wow. Cant remember all names but I believe Paul Yi here at FM is one of them. Apart from PP skill and composition taste and all that I realized that the lens I got was severely crippled.

I'm no lens surgeon by any standard but finally I did this. Hopefully someone else will find this thread and realize that you can do this better than me. If I did it a 2nd time the "(not)" would not be in the title.

So here's the lens. If you look carefully you'll see where my 5D2 mirror have hit a number of times. Look to the left on the retainer ring, you'll see two small light marks on each side. This is the upper side of the lens when mounted. The chip is at the bottom (to the right).


And here's the problem. A 5D2 in all it's glory but not capable of using this glass to all what it is capable of. It's as much lens-porn as a CY 85/1.4, just a shell and then glass. Dont mind the dust, for this lens I am using a semi-productive filter as lens protection, I never shoot with it on.


This is what you'll need. A dremel or similar. This is a 40€ probably Chinese made and for those living in Scandinavia this is from Clas Ohlson. Now, I was not sure what kind of grinder/front to use and I started with the pink stonish variants. That is bad, dont use those (!). What's mounted here is a more standard grinding/sand paper cylinder and that really eats through the soft metal nicely.


This is how the set up looks like. The lying radio to the left sole purpose was to lift/hold a flash-light to clearly see where you grind. The cloth here is real Cashmere scarf from Italy, but you can do with something simpler :-)


As you see in the previous image you want to cover cavities with tape carefully. I had a strong vacuum cleaner and each and every 2-3 minutes I used it close to what has been grinded. VERY close. It's like copper or a similar soft yellow metal that turns into golden dust. When paused you may wanna use a black marker when you see where you want to grind the most next time, you want it even of course. The mirror-box is flat, and if you e.g. use Liveview, the mirror will lock up and extend the lower part of the mirror box with 2-3mm.


Now, here's the final result. It took three iterations (grinding-vacuum-test) before the mirror got clear. Now it's clear for infinity both in Liveview and normal shooting. The retaining ring is still very secure although it's only parts of mm's left. It's not very visible on this image but now there's a clear 1 mm slope now to the right - which in this image is the upper part of the lens when mounted. The grinding should of course be centered at the top of the distance/DOF scale of the lens.


Now, I made a mistake. A single second I grinded carelessly so I got a scratch in the back element. It's a small scratch and I am sure it does not affect image quality. But the value was cut in half that second while the lens usability was doubled. A bit contradictory of course. Regardless, here's the first ever infinity shot by this lens on a 5D2 and I will surely explore this lens further now. This is a 5 sec tripod shot through the window with reflections and all an hour ago. From my apartment on the 5th floor down to the street. Two cars came and went away if you wonder about the lights. Shot is very sharp.





Dec 25, 2012 at 12:08 AM
johnahill
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p.1 #2 · p.1 #2 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


Beautiful shot


Dec 25, 2012 at 12:13 AM
Mescalamba
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p.1 #3 · p.1 #3 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


Well, Im sure that since you will sell it for half a price, someone will appear..

Just not me cause neither of my cams can take this beauty.

Looks pwetty..


Btw. scratches on front/back elements usually dont harm photos much if at all, unless its not tragical scar..


Off-topic. Why the heck is Skoda (Škoda) used so much in Sweden? (I suspect its where you live, cause even tho we have similar views on street, theres no snow currently and 15°C..).



Dec 25, 2012 at 12:22 AM
phuang3
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p.1 #4 · p.1 #4 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


It would be safer to use a file rather than dremel. In addition, I'd use duct tape to cover the rear element before the surgery. Cogitech has an excellent article about converting this beautiful lens into EOS mount. Please read here.


Dec 25, 2012 at 12:33 AM
Mescalamba
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p.1 #5 · p.1 #5 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


phuang3

Actually probably good advice, Dremel might heat things up pretty fast, but then lens can survive a lot and its way faster than by hand..



Dec 25, 2012 at 12:54 AM
R.Young
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p.1 #6 · p.1 #6 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


Well done on the conversion. Unlucky with the scratch but as you say, probably never going to show in any photo. I used a simple needle file and it took a while but I can get infinity in live view, just not outside of live view, but I'm fine with that.


Dec 25, 2012 at 12:55 AM
phuang3
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p.1 #7 · p.1 #7 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


Mescalamba wrote:
phuang3

Actually probably good advice, Dremel might heat things up pretty fast, but then lens can survive a lot and its way faster than by hand..


I also have a unmodified Rokkor 58/1.2 /w Leitax mount. I am thinking about shaving the mirror instead (work for all the lenses). It's a hard choice, though.



Dec 25, 2012 at 01:00 AM
Mescalamba
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p.1 #8 · p.1 #8 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


If its for one lens, probably not worth it. But if you have like 5 lens which wont clear mirror then I would probably shave mirror..

I think shaving mirror wont lower value of camera much. Actually I would probably rather buy one with already shaved mirror.



Dec 25, 2012 at 01:05 AM
LightShow
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p.1 #9 · p.1 #9 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


The first thing I'd do is protect the elements, dust in the lens can be cleaned, scratches will be there forever, I used electrical tape to protect the element and keep out filings.
I would rather take an hour or two to carefully file what needs to be removed then to use a high speed tool to do it quickly if it means not damaging the rear element.



Dec 25, 2012 at 02:53 AM
helimat
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p.1 #10 · p.1 #10 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


I actually just removed the rear retainer, leaving the rear element in place and safely removed the material well away from any glass.


Dec 25, 2012 at 05:40 AM
 

Search in Used Dept. 



zhangyue
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p.1 #11 · p.1 #11 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


Wfrank, Nice illustration. Very good timing, As I have some R lens need to trim or trim the mirror.

I am suprised you didn't cover the rear element doing this. Is the long extension standard part of Dremel? What kind of sand paper I have to use for metal?

Anybody know where to find the info for trimmed Mirror? better with detail picture.



Dec 25, 2012 at 06:25 AM
phuang3
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p.1 #12 · p.1 #12 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


Mescalamba wrote:
If its for one lens, probably not worth it. But if you have like 5 lens which wont clear mirror then I would probably shave mirror..

I think shaving mirror wont lower value of camera much. Actually I would probably rather buy one with already shaved mirror.


I agreed, and most FMer here would do that, too. My troubles are Leica 19/2.8 II & 21-35 ASPH. I just don't feel comfortable to do the surgery on them which leaves me only one choice - mirror shaving. I have to say it's very challenging for me.



Dec 25, 2012 at 07:13 AM
zhangyue
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p.1 #13 · p.1 #13 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


phuang3 wrote:
I agreed, and most FMer here would do that, too. My troubles are Leica 19/2.8 II & 21-35 ASPH. I just don't feel comfortable to do the surgery on them which leaves me only one choice - mirror shaving. I have to say it's very challenging for me.

Have you done it?
Any info about mirror shaving anywhere?



Dec 25, 2012 at 08:43 AM
phuang3
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p.1 #14 · p.1 #14 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


zhang,

No, I haven't, but I think I will wait for a while. Maybe there will be FF mirrorless camera soon, then we don't need to do this. Someone post the instruction here. If I ever did this, I'd prefer a dremel.



Dec 25, 2012 at 09:34 AM
phuang3
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p.1 #15 · p.1 #15 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


I just found someone who offers pro mirror shaving service for 70 bucks. The picture looks promising. I am sending mine...

Before








After








Dec 26, 2012 at 11:20 PM
Mescalamba
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p.1 #16 · p.1 #16 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


Nice, but that mirror doesnt seem too healthy on second shot..


Dec 27, 2012 at 01:10 AM
phuang3
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p.1 #17 · p.1 #17 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


Mescalamba wrote:
Nice, but that mirror doesnt seem too healthy on second shot..


I see nothing wrong in 2nd picture. Could you be more specific?



Dec 27, 2012 at 03:50 AM
sebboh
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p.1 #18 · p.1 #18 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


helimat wrote:
I actually just removed the rear retainer, leaving the rear element in place and safely removed the material well away from any glass.



+1

why do so many people keep trying to operate on their lenses with the glass right there?



Dec 27, 2012 at 04:00 AM
timballic
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p.1 #19 · p.1 #19 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


That ring unscrews easily and then you can operate on it without fear of lens damage, (leaving the rear element in position.)

This is what Jim Buchanan recommended me with his EOS kit for this lens.

The lens looks a beauty by the way.



Dec 27, 2012 at 08:11 AM
wfrank
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p.1 #20 · p.1 #20 · How to (not) fix your Rokkor 58/1.2 for infinity on EOS (5D2).


Well we must have different versions of the lens then. That ring does not come off easy, the full rear element group follows and thats why I kept it in place.


Dec 27, 2012 at 09:00 AM
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