55mm micro nikkor on a digital body

[yucel]

It's a CPU embedded mir 24N.
I modified the original mount with dremel and inserted a nikkor cpu with the same f value from a damaged lens.
There is enough room inside MIR to place a cpu and it was 2 hours work for me to finish this mod. BTW it was my first cpu mod.
If anything like dandelion for nikon exist it'd be much easier to use that solution.
Anyway, a cpu modded lens gives matrix and spot metering, DOF preview, A-S-P exposure capabilities and aperture control from the camera body (on d70s).
You may say "use an AF lens then" but there is no MIR 24N AF (ok 35/2 nikkor exists but I like my MIR), micro 55/3,5 cost me 50$ and I don't need AF for macro work then why get the expensive 60mm AF micro?
Besides all, giving life to old lenses on digital cameras makes me happy, I get the satisfaction that I get when I was using my first camera (petri).
Last night I inspected the inner parts of 55mm and it seems like there is some space for a cpu which I removed from an old f:3,5 sigma lens. If everything goes all right I'll share the results here.

Best regards

[ChrisLilley]

[yucel]

Bad news. When I tried to stuck sigma cpu into 55mm micro, it can only focus between 1m and 0,24m because the cpu board is square shaped (too big for the free space) and not flexible (less likely to adapt it's shape to lens barrel) like nikkor cpus. Therefore, lens movement is limited and I don't want to grind the inner lens parts to create space.

The space between the hood on the rear part of the lens and the rear lens element seems suitable to occupy sigma cpu but this is not a neat solution therefore it's another discarded option.

I guess next best alternative is to find a cpu with narrow, flexible print board from an AF nikkor and aperture value of 3,5 increases the chance of finding suitable cpus.

However, there is still enough space in 55mm when compared to MIR24N.

That's all the progress right now and one thing that is assured is, nikkor lenses are not only superior in terms of optical quality but also electronics inside are better than non-OEM brands.

[yucel]

...and good news. I have an old russian teleconverter for nikon. It has removable optics which I already discarded some time ago.
Now it seems more logical to built my own cpu modded PK-13 or you name it.
PK-13 has 27,5mm extension which is similar to russian converter. I checked and found there is enough space in the converter.
To cut things short, next try is on the way. Hope this will bring success

[yucel]

Finally I built my cpu embedded home made extension tube. It was originally a russian 2X teleconverter but now it is a half sigma half russian extension tube.

I'll share the photos of construction and final result soon.

I tested it on my work bench last night and photographed some drill bits. Exposure and focus was all right and it makes 55mm micro work flawlessly with d70 body.

PK 13 has 27,3 mm extension, home build one has 27,1, aperture control from the camera body is available, all exposure and metering modes are working.

[Richard_D]

[yucel]

Yes, Franken PK-13 is born.
When I search the net for similar modifications I found this link.
http://www.naturfotograf.com/CPU_extension.html#top_page
Someone has already done it before me. I wish I had seen his page before.

[yucel]

Story of franken pk 13

It all started with the idea of modifying a micro nikkor 55mm f3.5 with a cpu to be able to use it on a nikon d70s without any restrictions.

But inner space of 55mm nikkor was the main restriction for such a mod with the available sigma cpu. That's how the cpu looks like.



Therefore, other options were considered and building a franken pk-13 from the remains of an old russian converter came up to my mind. Original converter is smt like this.



What I have is smt like this



Best option is to merge sigma mount and cpu with the russian converter. A lot of grinding, cutting and assembly was required for such a combination.







Parts painted matte black after modification.



And final product.









First shot after final assembly.



Franken pk-13 does it's job real well. Even no exp. compensation is required. Sample photos will follow.

Regards

yucel

[Richard_D]

Nice work! Personally I'm happy to forego these experiments and cope with the D200's metering, but you've done a good job.
_________________
Richard

The interesting bit:

Nikkors: 20mm f2.8 AIS, 24mm f2.8 AIS, 28mm f2.8 AIS, 35mm f2 AIS, 50mm f1.4 AI, 50mm f1.48AI, 50m f2 AI,
55mm f3.5 AI'd, 105mm f4 AI, 135mm f2.8 AI'd, 135mm f3.5 AI'd, 200mm f4 AI'd .
Nikon E Series: 100mm f2.8 .
Soviet Nikon Mount: Zenitar 16mm f2.8, Arsat/arax/photex 85mm T&S f2.8 .
Other: Asahi Super Takumar 55 mm f2 (M42) ,Tamron 300mm f5.6 SP, Tamron 500mm f8 SP.

DSLR: Nikon D700. 35mm SLRsNikon FE, Pentax S1a.
TLR: Rolliecord II.
Sub-Minature: Pentax Auto 110, 18mm f2.8, 24mm f2.8, 50mm f2.8.

More to come...