Canon EF 50mm f/1.2L USM converted to SA mount!!!!

Started Aug 13, 2007 | Discussions
Daiver Regular Member • Posts: 130
Canon EF 50mm f/1.2L USM converted to SA mount!!!!

Yes, i am do it!
All work exellent. Autofocus, shutter, .... full electronics.
I give you more info after sleep.

DaSigmaGuy Forum Pro • Posts: 12,308
Re: Wake up!...

Daiver wrote:

Yes, i am do it!
All work exellent. Autofocus, shutter, .... full electronics.
I give you more info after sleep.

...We are all waiting to see the results!

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OP Daiver Regular Member • Posts: 130
Re: Wake up!...

DaSigmaGuy wrote:

...We are all waiting to see the results!

Ok. Ok. Please some wait.
After comeback from work, i'll post photos.
And say about what was difficult, and what was easy.
But it work.

OP Daiver Regular Member • Posts: 130
PHOTO (Front View)

OP Daiver Regular Member • Posts: 130
PHOTO (Front View 2)

OP Daiver Regular Member • Posts: 130
PHOTO (Side View)

OP Daiver Regular Member • Posts: 130
PHOTO (Top View)

OP Daiver Regular Member • Posts: 130
PHOTO (Lens Mount)

OP Daiver Regular Member • Posts: 130
Re: Wake up!...

...We are all waiting to see the results!

Hi.
Im post some fast photos.
Sorry for delay. Its to many work.

Tristan Cope Senior Member • Posts: 1,141
Ouch!

Looks like a bit of a hatchet job on the mount. Presumably the lens itself survived intact though? Did you take any photos of the conversion process?

Seems like an expensive lens to convert?

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I think I'll change my signature

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Pawel Olas
Pawel Olas Regular Member • Posts: 491
Re: Ouch!

Tristan Cope wrote:

Looks like a bit of a hatchet job on the mount. Presumably the lens
itself survived intact though? Did you take any photos of the
conversion process?

Seems like an expensive lens to convert?

yea but it might be worth the risk and effort! I would love to know details of conversion. and some pictures please

Pawel

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OP Daiver Regular Member • Posts: 130
Re: Ouch!

Looks like a bit of a hatchet job on the mount.

You speak about one screw ? You right.
I am drill hole very fast, and i miss.
Then it need to do hole very closer, and i am do it not very good, but fast.
May be in future.... when i have more time.... i'll do new plate
and it will be beauty.

I was lucky that the other three holes in sigma plate was in the same place
as in canon plate. But canon screw head was some bigger, and its need
to do hollow with bigger diameter. But its simple to do.

Presumably the lens itself survived intact though?

All modifications does not touch no one original surface of lens.
More: it is possible to do back modification without any difference,
with one exception: inside lens there is plastic plate, in wich i am turn
one side. But its does not change anything.

Did you take any photos of the
conversion process?

Some late i will post photos.
And you will see, that is not hard process.

The main problem is that the sigma mount plate inside diameter
is less than canon. And i spend much time to grind off electronoc plate
and fuse in electronic platfrorms. (sorry for my English) To do it very thin,
because glass is very closer.

Seems like an expensive lens to convert?

Yea. But i need this lens to get photos and be happy

OP Daiver Regular Member • Posts: 130
Re: Ouch!

Pawel Olas wrote:

yea but it might be worth the risk and effort!

at this time i thin thereis no risk, because you may recover
all modification, and get worked canon lens

I would love to know
details of conversion. and some pictures please

I think some later, when i have free time.

emklap Contributing Member • Posts: 614
Nice work :-)

A nice conversion, I am interrested in the electronics and the communication from the Sigma Body to the canon Lens.

Is Auto Focus maintained?

Is the Appature setting maintained?

If it is fully comaptibel it could allow much more nice lenses for the Sigma body.

Arky Regular Member • Posts: 433
Manual focus?

Good job on the conversion, a first for that lens AFAIK. Pay no attention to people that criticize your workmanship, you managed to mount that flange with all 4 screws and that's what counts.

I haven't seen that lens in person but I assumed that rear lens element would be bigger than it actually is, it actually looks to be about the same size as the canon 50mm f/1.4.

I have converted a few canon lenses to SA mount and those with electronic manual focus lose the ability to manual focus with the SD9 and SD10, although auto-focus works well.
Does the electronic manual focus on that lens work with the SD14?

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Whistling Forum Member • Posts: 57
Re: Nice work :-)

And if, by any chance, this combo requires calibration, who's going to be happy to do it? Sigma or Canon?

Richard

OP Daiver Regular Member • Posts: 130
Re: Nice work :-)

emklap wrote:

Is Auto Focus maintained?

Yes.

Is the Appature setting maintained?

Yes.

If it is fully comaptibel it could allow much more nice lenses for
the Sigma body.

Someony say to me, that thereis 2 moments that not supportet:
1. Canon IS

2. Manual focusing on lens that have only electronic focusing. Where when you move focusing ring, lens send info to the camera, and camera send commands to lens to change focus. On lens focusing ring is not tied with optics scheme.

OP Daiver Regular Member • Posts: 130
Re: Nice work :-)

Whistling wrote:

And if, by any chance, this combo requires calibration, who's going
to be happy to do it? Sigma or Canon?

Do you speak about front focus/back focus ?

I am test lens yesterday. We shot ruler on table from camera with angel of 45 degree. With diaphragm 1.2. And focusing at the beginning of ball point pen.

And then look on depth of field of the ruler on image. Perfect! It was that i want.

OP Daiver Regular Member • Posts: 130
Re: Manual focus?

Arky wrote:

Good job on the conversion, a first for that lens AFAIK. Pay no
attention to people that criticize your workmanship, you managed to
mount that flange with all 4 screws and that's what counts.

Thank you.

I haven't seen that lens in person but I assumed that rear lens
element would be bigger than it actually is, it actually looks to be
about the same size as the canon 50mm f/1.4.

The rear lens element diameter is 38 mm.

I have converted a few canon lenses to SA mount and those with
electronic manual focus lose the ability to manual focus with the SD9
and SD10, although auto-focus works well.
Does the electronic manual focus on that lens work with the SD14?

I dont know. Some people say me the same. But Canon 50 1.2 have not electronic manual focus. When i move focus ring i lens inside moving. It work without camera. It is real manual focusing lens. Electronic manual focus have Canon 85 1.2 lens.

DaSigmaGuy Forum Pro • Posts: 12,308
Re: Manual focus?

Arky wrote:

Good job on the conversion, a first for that lens AFAIK. Pay no
attention to people that criticize your workmanship, you managed to
mount that flange with all 4 screws and that's what counts.
I haven't seen that lens in person but I assumed that rear lens
element would be bigger than it actually is, it actually looks to be
about the same size as the canon 50mm f/1.4.

The rear element of my Canon FL 55mm f1.2 is 40mm, 2mm bigger than rear element of the Canon EF 50mm f1.2 and it still fits inside an SA mounting plate with at least 2mm to spare all round, as long as you remove the three internal bezal ring mounting lugs of course.

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