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Archive 2009 · 35mm: Nikkor, Zuiko and Rokkor

Ronan O Keeffe
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p.3 #1 · p.3 #1 · 35mm: Nikkor, Zuiko and Rokkor

Quick as was humanly possible so it's rough out. Lens focused to infinity.


	http://farm4.static.flickr.com/3452/3885328456_f4becde32d_b.jpg

Sep 03, 2009 at 08:31 PM

JimBuchanan
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p.3 #2 · p.3 #2 · 35mm: Nikkor, Zuiko and Rokkor

If you don't mind my asking, By substituting the new back for the original Minolta back, you loose the cam based aperture control mechanics. How do you accurately change the f/stop?

Sep 03, 2009 at 09:08 PM

Ronan O Keeffe
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p.3 #3 · p.3 #3 · 35mm: Nikkor, Zuiko and Rokkor

Hi Jim,

I probably should have stated that I was referring to the picture when I said 'rough out'. It was a quick grab job as I was running last night.
The conversion is of course first rate. Dim.Ka did the job so he'll be in a better position to comment than me, I'm just posting a pic in the hope that it will help.

I'm not sure what you mean by cam based aperture control but I stop down by turning the aperture control ring as normal.

Sep 04, 2009 at 03:48 AM

JimBuchanan
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p.3 #4 · p.3 #4 · 35mm: Nikkor, Zuiko and Rokkor

As the aperture ring is turned in equal increments toward wide open, the blades open by a greater increment, until the blade movement is the greatest between wide open and 1 stop down. The underside of the original back has the linkage.

A good test would be to see if the shutter speed gets halved each time the aperture ring is stopped down a stop from wide open. In the case of the 35/1.8, maybe start with f/2.8 @ .xxx seconds, then check for f/4 @ .xxx/2 seconds.

Going the other way, from f/2.8, f/1.8 @ .xxx times 2 seconds maybe a little more, as its more than 1 stop between f/1.8 and f/2.8.

Sep 04, 2009 at 06:04 AM

m-a-x
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p.3 #5 · p.3 #5 · 35mm: Nikkor, Zuiko and Rokkor

Jim, I converted a 45mm MD Rokkor recently. Looks so similar to this 35mm that I thought I could contribute here:
The way I did it was not to change the minolta back for the EOS back but to remove as much material from the minolta back in order to place the EOS mount on top of it. Thus, the aperture mechanics on the inner side are untouched (well, I removed the spring and the linkage-lever during the operation, but later I re-assembled them).
I removed everything from the Minolta back down to 1mm remaining thickness. Now, my M42-EOS adapter on top of that adds flange thickness. Fine tuning for infinity is done with adjustment screws at the front of the lens.
Regards, Alex

Sep 04, 2009 at 06:23 AM

JimBuchanan
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p.3 #6 · p.3 #6 · 35mm: Nikkor, Zuiko and Rokkor

Alex, thats the way I do it, at least I retain the original back. My method for the bayonet is a little different.

I may have wrongly assumed the above lens had the M42-EOS adapter in place of the original Minolta back.

Sep 04, 2009 at 07:49 AM

pengland
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p.3 #7 · p.3 #7 · 35mm: Nikkor, Zuiko and Rokkor

m-a-x wrote:
Jim, I converted a 45mm MD Rokkor recently. Looks so similar to this 35mm that I thought I could contribute here:
The way I did it was not to change the minolta back for the EOS back but to remove as much material from the minolta back in order to place the EOS mount on top of it. Thus, the aperture mechanics on the inner side are untouched (well, I removed the spring and the linkage-lever during the operation, but later I re-assembled them).
I removed everything from the Minolta back down to 1mm remaining thickness. Now, my M42-EOS adapter...Show more →

+1

I have used exactly the same method with a couple of Rokkor lenses. 1 mm of material is plenty to provide the support necessary for the aperture mechanics especially since it is backed by approx 1.4mm of the EOS adapter flange material plus several more millimeters of the EOS mount material.

Sep 04, 2009 at 08:14 AM

Ronan O Keeffe
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p.3 #8 · p.3 #8 · 35mm: Nikkor, Zuiko and Rokkor

Hi Jim,

Just to confirm that shutter speeds halve or double accordingly.

Sep 04, 2009 at 11:05 AM

Dim.ka_
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p.3 #9 · p.3 #9 · 35mm: Nikkor, Zuiko and Rokkor

JimBuchanan wrote:
If you don't mind my asking, By substituting the new back for the original Minolta back, you loose the cam based aperture control mechanics. How do you accurately change the f/stop?

Jim, in my 35mm f1.8 convertion i leave all original parts and mechanics intact - the only thing i did some lathe machining inside m42 adapter (which is the new mount)

Sep 04, 2009 at 01:16 PM

Kyle Nordeen
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p.3 #10 · p.3 #10 · 35mm: Nikkor, Zuiko and Rokkor

What is fair market value for a Zuiko 35/2 in good condition? KEH has one in EX condition for $225, and there is one on eBay that I am watching that is $200. Are these good prices?

-Kyle

Sep 04, 2009 at 06:19 PM

cavewalker
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p.3 #11 · p.3 #11 · 35mm: Nikkor, Zuiko and Rokkor

Kyle Nordeen wrote:
What is fair market value for a Zuiko 35/2 in good condition? KEH has one in EX condition for $225, and there is one on eBay that I am watching that is $200. Are these good prices?

-Kyle
I've paid 100 Euro at ebay germany

Sep 05, 2009 at 12:07 AM

Ed Sawyer
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p.3 #12 · p.3 #12 · 35mm: Nikkor, Zuiko and Rokkor

Those are about right ($200-250). I have a really nice spare one I'd part with in that range (OM 35/2)

-Ed

Sep 05, 2009 at 07:34 AM

weezintrumpete
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p.3 #13 · p.3 #13 · 35mm: Nikkor, Zuiko and Rokkor

Thanks for all the response guys! I am not in a position where I can find a machinist close, so I think I'll just hold off and sell it. I know that I want to keep the Nikkor, so I don't see any point in keeping two 35mm lenses. If I do, it'll be the big 35 (Nikkor) along with a small 35 (like the Zuiko 35/2.8).

That and I'm scared that if I try to modify it, I'll nick the glass

Sep 05, 2009 at 12:51 PM

Empire
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p.3 #14 · p.3 #14 · 35mm: Nikkor, Zuiko and Rokkor

sell em all and spend the money on a zuiko 24/2 or 24/2.8 and 35/2.8

I could survive quite nicely on just 24, 35 and 50/85

Sep 05, 2009 at 01:11 PM

weezintrumpete
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p.3 #15 · p.3 #15 · 35mm: Nikkor, Zuiko and Rokkor

Yep, that's what I plan on doing basically. I'll have the Zuiko 24/2.8, Zuiko 35/2.8, Nikkor 35/1.4, Zuiko 50/1.4 and I'm still looking for that fast 85...

I have the Nikkor 105/2.5 and Tamron SP 90/2.5, but they're both a tad long (the Nikkor especially) and not quite fast enough (I'd like f/1.8 ideally).

Good plan!

Sep 05, 2009 at 01:25 PM

Makten
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p.3 #16 · p.3 #16 · 35mm: Nikkor, Zuiko and Rokkor

Empire wrote:
I could survive quite nicely on just 24, 35 and 50/85

Me too! Three primes makes a great kit. I sold my Nikkor 35/1.4 and bought a CV 40/2 instead, but the FL is quite similar. So now I have two "kits" that I choose from:

17/3.5 + 40/2 + 85/1.4
28/2.8 + 50/1.2 + 105/2.5

A fast 35 mm lens in the first kit had done well too, instead of the 40. I'm gonna replace the 17 (Tokina) with something a bit longer. Perhaps the CV 20/3.5.

Sep 05, 2009 at 02:13 PM

Ed Sawyer
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p.3 #17 · p.3 #17 · 35mm: Nikkor, Zuiko and Rokkor

Consider the OM 85/2 or perhaps the rokkor 85/1.7 to round out the fast 85 world. Of course there's the EF 85/1.8 or better yet the 85/1.2L but those are a bit more $.

Sep 05, 2009 at 09:58 PM

weezintrumpete
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p.3 #18 · p.3 #18 · 35mm: Nikkor, Zuiko and Rokkor

Yeah, I've thought about the OM and Rokkor. Would I have the same problem with the 85/1.7 Rokkor as I do with the 35/1.8? Seems like I would..

Sep 05, 2009 at 10:08 PM

JimBuchanan
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p.3 #19 · p.3 #19 · 35mm: Nikkor, Zuiko and Rokkor

weezintrumpete wrote:
Yeah, I've thought about the OM and Rokkor. Would I have the same problem with the 85/1.7 Rokkor as I do with the 35/1.8? Seems like I would..

Nope. The 85/1.7 Rokkor has the lens group out there in front, and there are no infinity/mirror issues.

Generally, the longer focal lengths are farther away from the camera lens flange.

Sep 05, 2009 at 11:04 PM

Empire
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p.3 #20 · p.3 #20 · 35mm: Nikkor, Zuiko and Rokkor

The zuiko has a rendering style that I think is ideal for portraiture and would match your other lenses perfectly.

The rokkor rendition is also fairly similar. Both good choices!

Makten you've pretty much got the right idea with those kits..

I usually have 21 - 35 - 85 or 28 - 50 - 85. I absolutely wish I had a 40/2...

I'm currently agonising over constructing an ideal travel kit. Unfortunately I shoot a WIDE variety of stuff so I almost need to take two setups :\

Sep 06, 2009 at 09:33 AM

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