Topic: Lens mount conversion: Canon FL 85mm 1.8 to P/K

Yesterday, I went to a local camera shop and saw a copy of Canon FL 85mm 1.8 at a reasonable price. I grabbed it and planned to convert it to P/K mount. Following is a brief guideline since I did not take any picture during my work and this process is not repeatable, sorry smile

1. You need to cut down the rear part of the lens (I used a Stanley mini hacksaw from Walmart to do this). Please see the pictures below to have an idea where you need to saw.

2. Super-glue a M42 -> P/K adapter to the back of the lens (where you saw it). And that's it you have a 85/1.8 in P/K mount.

This is the original lens (From http://www.mir.com.my/rb/photography/co … index.htm)
http://www.mir.com.my/rb/photography/companies/canon/fdresources/fllenses/FL85mmf18_B.jpg

And this is the modified version in P/K mount
http://i30.photobucket.com/albums/c313/xtriky/Equipment/_IGP4892.jpg

There are some imperfections in my modification:

1. The lens will not have infinity focus. The maximum distance it can focus is around 7-10m. Anyway this distance is good enough for portrait that is my main purpose of using this lens.

2. The focusing ring is unusable. It is bonded with the adapter so will be immobile. To focus, you need to rotate the front of the lens. The focus mechanism is quite long, it takes about a complete turn to go from minimum to maximum focus distance.

3. It is not very convinient to use the aperture ring. This lens is designed in preset style as Jupiter-9 or Zuiko lenses. Its aperture ring is attached on the front of the lens. Since the front is free to rotate for focusing, this makes it difficult to adjust the aperture setting. For me, it is not a big deal because I will use this lens wide open most of the time.

This is my second 85mm after the Jupiter-9 which was sold. IMO, this lens really beats the Jupiter-9 in term of sharpness wide open.

Some test shots at wide open

http://i30.photobucket.com/albums/c313/xtriky/Lens%20test/_IGP4882.jpg

100% crop
http://i30.photobucket.com/albums/c313/xtriky/Lens%20test/_IGP4882crop.jpg

http://i30.photobucket.com/albums/c313/xtriky/Lens%20test/_IGP4884.jpg

Re: Lens mount conversion: Canon FL 85mm 1.8 to P/K

This brings up a good point.    I've "converted"   a Canon 200mm 2.8 FD   to Canon EF,  but in all the FD lenses,  the problem is getting the aperture to work (at all)   much less accurate at the ring indication.

Is the aperture linkage simpler on FL lenses?

What other Canon lenses have "front"  ring aperture control,  which might make modification easier?

Last edited by 440roadrunner (2007-12-30 21:37:09)

Re: Lens mount conversion: Canon FL 85mm 1.8 to P/K

Some kind of unusual but working idea. ;-)
Of course, it is sharper than the J9 wide open, but that does not qualify the Canon lens. The J9 is really soft wide open. How do the lenses compare at, say, f5.6?

Mostly in my bag ATM: Fuji X-T1, X-E2, X-E1, Leica M8, Nikon1 V1 and several lenses...
Things ON SALE!

Re: Lens mount conversion: Canon FL 85mm 1.8 to P/K

I don't have the J9 anymore, so there is no side by side comparison. From my memory, I think the Canon FL 85/1.8 outperforms the J9 in term of sharpness.

Canon users: This modification seems better for Canon EOS camera since infinity focus should be ok.

Re: Lens mount conversion: Canon FL 85mm 1.8 to P/K

I have this lens as well-terrific build quality. Currently trying to use it (unmodified) on an EOS so no infinity focus. I'm very sentimental, so don't really want to alter the lens for an EOS (even though I'll probably never use it on an FD film camera) With an FD to EOS adapter (without a correction element) you can focus up to about 60cm away so limited use.

It is almost exactly the same physical size as the 58mm f/1.2 Super-Canomatic I have that I also don't want to alter smile

Kodak DCS serial no. survey
EOS-1D, Kodak DCS, EOS*DCS-3, EOS*DCS-5, DCS-200ci, DCS-420, DCS-460, NC2000e, D1H, D1X, D2H, E2, F, F3, Canon 7+f/0.95, F-1, EF 50mm f/1.0, EF 85mm f/1.2, GSX-R1000 K9

Re: Lens mount conversion: Canon FL 85mm 1.8 to P/K

I'd like to try this conversion - a FL 85mm 1.8 to EF mount. There are a few examples on the web of people converting the FL 55mm 1.2, but this is the only one for the 85mm 1.8 that I've found.

Thanks xtriky.

Does anyone know of a way to do this, a la the FL 55 1.2, that will preserve infinity focus and well, just plain focus? The rear mounting setup on the 85mm 1.8 looks different from the 55mm 1.2 - there aren't the same three screws on the 85mm 1.8  that hold on the rear mount, instead there's moulded piece there - like with the FL 35mm 2.5 and the FL 50mm 1.8. hmm

Your help will be very much appreciated.

Last edited by scottyea (2009-11-21 07:22:50)

SMC Takumar  1.8/55 & 2/55; Super Tak 1.8/55, -Zoom 4.5/70-150mm & 1.4/50; S-M-C Tak 1.4/50, 3.5/135 & 4/200; Tele-Tak 6.3/300mm (awesome fun);  CZ Planar 1,7/50 T*; Helios 44m-4;  Industar 50-2;  Jupiter 135/3.5 (Olympic);  Tamron SP AF Asph DiII 11-18mm 4.5-5.6;  Tokina AF 20-35mm;  Z Jena 2.8/50;  Zuiko 1.4/50 & 1.8/50  on an EOS 10D

Re: Lens mount conversion: Canon FL 85mm 1.8 to P/K

scottyea wrote:

I'd like to try this conversion - a FL 85mm 1.8 to EF mount. There are a few examples on the web of people converting the FL 55mm 1.2, but this is the only one for the 85mm 1.8 that I've found.

Thanks xtriky.

Does anyone know of a way to do this, a la the FL 55 1.2, that will preserve infinity focus and well, just plain focus? The rear mounting setup on the 85mm 1.8 looks different from the 55mm 1.2 - there aren't the same three screws on the 85mm 1.8  that hold on the rear mount, instead there's moulded piece there - like with the FL 35mm 2.5 and the FL 50mm 1.8. hmm

Your help will be very much appreciated.

Hey, there.


Personaly, I don't like making permanent or irreversible adaptations on lenses, MUCH more so if it's a vintage item such as the one from the original poster (even if I've done a couple of permanent adaptations myself hmm).


That said, I don't have that much experience with FD/FL lens adaptations (I've adapted one FD mount lens to F mount), but I supose the FD/FL mount has one good thing: The whole mount assembly, including aperture linkage to the lens, can come out, and that is a large piece.

So, despite the short register distance of the FD/FL mount, you get a lot of space to work, if your idea is to do a mount swap, AND it is probably reversible (mind you, I'm talking from my experience with an FD mount Cosina and a Cosina-made Vivitar lenses, I SUPOSE real Canon glass would be similar wink so, if anyone knows better, please shut me up wink).


I guess your best option is to get an FD/FL lens, an EF mount (namely, some M42-EF adapter, for example), take the FD/FL mount out of the lens and see what's under it and how you can put the new mount in. In the worst case, you can always resell the lens...


Let us know how it turns out, and if you have more questions, you know where we are wink!



Cheers!

Nikon: D7000; F2; F4; FA. RMC Tokina 17/3,5; Ensinor 24/2,8 Macro; Nikkor: S.C. 50/1,4; AI-s 28/2,8; Micro 55/2,8; 80-200/4; S. E: 35/2,5; 100/2,8; Viv. S. 1 105/2,5 Macro (Kiron); MC Rokkor PG 58/1,2; Canon FD 300/4; Pentacon 135/2,8.
Pentax: K20D; CZJ Flek 20/4; SMC Pentax: A 28/2,8; 50/1,7; M 50/1,4; Tak. 50/1,4; Tamron Adall 2: SP 90/2,5 Macro; SP 60-300; 35-70/3,5 CF; .
And some others...

Re: Lens mount conversion: Canon FL 85mm 1.8 to P/K

With the FL 55/1.2, you can remove the mounting mechanism and then end up with a flat surface with little screw holes for an adapter.

But the FL 85/1.8, 35/2.5 & 135/2.5 have a different kind of mounting setup.

On these lenses, when you remove the breechlock mounting mechanism, instead of the flat surface like on the 55/1.2, you end up with a raised rim, and a bunch of screws around the place. Hm.

The inside diameter of an EOS/m42 adapter is too narrow to fit around that rim, but it looks like a EOS/Zuiko adapter would JUST fit, after a little modification.

Glimavitor, You'll be happy maybe to know that for starters I'll be attempting to change the mount on a life-size macro adapter, rather than on the actual FL 50mm/2.5 itself. Stay tuned!

OK, its mission time!!

Last edited by scottyea (2009-12-20 09:31:54)

SMC Takumar  1.8/55 & 2/55; Super Tak 1.8/55, -Zoom 4.5/70-150mm & 1.4/50; S-M-C Tak 1.4/50, 3.5/135 & 4/200; Tele-Tak 6.3/300mm (awesome fun);  CZ Planar 1,7/50 T*; Helios 44m-4;  Industar 50-2;  Jupiter 135/3.5 (Olympic);  Tamron SP AF Asph DiII 11-18mm 4.5-5.6;  Tokina AF 20-35mm;  Z Jena 2.8/50;  Zuiko 1.4/50 & 1.8/50  on an EOS 10D

Re: Lens mount conversion: Canon FL 85mm 1.8 to P/K

scottyea wrote:

..................The inside diameter of an EOS/m42 adapter is too narrow to fit around that rim, but it looks like a EOS/Zuiko adapter would JUST fit, after a little modification.......................

There are other adapters that can be used and may be larger ID.   Olympus OM,  or take a Nikon  adapter which are typically made in two pieces,  and toss the one piece.    This makes what is left thinner,  and gives you a large ID