Self-coded 35mm Summicron-M Asph

[robsteve]

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if you can make a CAD drawing: the first recess is at 220 degrees and then five degrees apart, using the lens lock detent as zero. the recesses are 1/16" wide and .100 long. the outer radius of the recess is about .025 from the adapter outside diameter

 

 

John:

 

I used your template to code a few lenses. In my case, I opened the PDF, chose print and then fit to margins. When a C6 envelope was chosen as the paper, it shrunk it 50% to the exact size to use as a template.

 

I then cut out this template, taped it to a Leitz 9cm adapter and using a Dremmel tool in their drill press attachment, I was able to use a small bit and engrave the size depessions. The circular hole cut by the bit worked fine, you don't need to make an oval. For now, the bright brass works for the white and I used a sharpie to fill in the black. I will eventually have to paint white into the white holes, as the brass may tarnish and no longer look white to the sensor.

 

http://www.leica-camera-user.com/attachments/digital-forum/24657d1170771354-self-coded-35mm-summicron-m-asph-leica-codes.pdf

 

Robert

[sean_reid]

These modified adapters John made are great. I've now painted the millings in each of them so that I have durable LTM adapters that are coded sucessfully as:

 

21/2.8 Asph

24/2.8 Asph.

28/2.0 Asph

35/2.0 Asph.

 

I'm still looking for one or two Leitz 5 cm adapters. If anyone has an old one around that he or she would like to sell, please let me know.

 

Cheers,

 

Sean

[sean_reid]

These modified adapters John made are great. I've now painted the millings in each of them so that I have durable LTM adapters that are coded sucessfully as:

 

21/2.8 Asph

24/2.8 Asph.

28/2.0 Asph

35/2.0 Asph.

 

I'm still looking for one or two Leitz 5 cm adapters. If anyone has an old one around that he or she would like to sell, please let me know.

 

Cheers,

 

Sean

[robsteve]

 

I'm still looking for one or two Leitz 5 cm adapters. If anyone has an old one around that he or she would like to sell, please let me know.

 

Cheers,

 

Sean

 

Sean:

 

Why the 5 cm adapters? Could you code lenses other than the 50mm with it?

 

Here is my attempt at coding a 9cm Leits adapter as a wate. I used John's cad drawing as a template and used a dremmel tool in a dremmel drill press. There may be a better way to do it as the bit wandered as it began the cut.

 

[sean_reid]

Sean:

 

Why the 5 cm adapters? Could you code lenses other than the 50mm with it?

 

Here is my attempt at coding a 9cm Leits adapter as a wate. I used John's cad drawing as a template and used a dremmel tool in a dremmel drill press. There may be a better way to do it as the bit wandered as it began the cut.

 

 

Hi Rob,

 

I have as many 9 cm and 13.5 cm Leitz adapters as I need (for the moment). I don't need to code my 50 and the test 75 but it makes it easier to keep track of which lens was used for which picture when I make illustrations for articles. I've got 7 of the Leitz adapters right now but no 5 cms for the 50s and 75s.

 

Glad to see that you were able to get that adapter working.

 

This is an example of one of the adapters John milled and then a picture of a painted adapter on a 35 Ultron. He does beautiful work.

 

Cheers,

 

Sean

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[robsteve]

Hi Rob,

 

I have as many 9 cm and 13.5 cm Leitz adapters as I need (for the moment). I don't need to code my 50 and the test 75 but it makes it easier to keep track of what lens is which when I make illustration pictures for articles. I've got 7 of the Leitz adapters right now but no 5 cms for the 50s and 75s.

 

Glad to see that you were able to get that adapter working.

 

Cheers,

 

Sean

 

I have two of the 5cm adapters. Can you code these adapters since they have a cutout or are you going to get them machined?

[sean_reid]

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I have two of the 5cm adapters. Can you code these adapters since they have a cutout or are you going to get them machined?

 

I'm looking for one or two that aren't notched (as the modern adapters are). I should have grabbed them before publishing the first article that recommended those old Leitz adapters (I think it was the review of 28s?) because since then old-style Leitz adapters have become harder to find and have at least doubled in price. I'm not too bright because I helped drive up prices of a product I need to buy.

 

Oh well...still looking for one or two old Leitz 5 cm adapters if anyone has them.

 

Cheers,

 

Sean

[robsteve]

I'm looking for one or two that aren't notched (as the modern adapters are). I should have grabbed them before publishing the first article that recommended those old Leitz adapters (I think it was the review of 28s?) because since then old-style Leitz adapters have become harder to find and have at least doubled in price. I'm not too bright because I helped drive up prices of a product I need to buy.

 

Oh well...still looking for one or two old Leitz 5 cm adapters if anyone has them.

 

Cheers,

 

Sean

 

Were any of the 5cm adapters not notched? I thought I read here that the cutout was to allow clearance for the infinity lock on some of the older 50mm lenses. I assume when you mean notched, you are referring to this cut away area.

 

The two Leitz adapters I have are notched and mention the framelines for M2 or M3.

[sean_reid]

There were some that weren't notched, I've seen them. I'm not sure how rare they may or may not be. Yes, when I say "notched", I am talking about the cut away area. Here's one of the coded adapters on my Kobalux 21 and by itself.

 

Cheers,

 

Sean

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[wlaidlaw]

I thought forum members might be interested in seeing what I sent to Carl Zeiss and the helpful reply I have received re. various queries on my ZM 21 and 35 lenses. Please note that they have slightly misunderstood the reason for fitting the 28mm bayonet to the 21mm lens.

 

Dear Sirs,

 

Having been a continuous Zeiss user, since first being allowed to take photographs with my father’s Super Ikonta and Contax IIA cameras in the early 1950’s, it was a natural choice to buy the ZM Biogon 21 and 35mm lenses for my new Leica M8. May I say how delighted I have been with the results in the two weeks I have used them. Not only are they as sharp as I expected but in comparison to many M fit lenses, the transition from in-focus to out-of-focus is beautifully managed. The gentle character of the out-of-focus elements (bokeh) is particularly important with the absence of an anti-aliasing filter on the M8 sensor, which accentuates any jagged edges on the bokeh. The other plus point in comparison to some other lenses, is how well the performance is maintained down to very small apertures, even f22.

 

However, there is one minor but important design error which drives me and other ZM users to distraction. The grip moulding lines on the release tabs of the the front lens caps are the wrong way, lying parallel to the lens axis rather than at right angles. This makes the lens cap close to impossible to remove easily. You have to squeeze in one tab, tilt the lens cap and shake it off into your hand – not very desirable I am sure you will agree. Replacing it is equally difficult. I, like a number of others, have effected a temporary fix with two small crescent moon shaped pieces of double-sided sticky tape on the lens cap tabs. This does not exactly look very professional!

 

Finally do you think there is any chance of negotiating with Leica-Camera AG to license their 6 bit lens coding system. You would then be able to offer from your repair agency an after-market lens coding service similar to that offered by Leica. This is not particularly important for your mid range and 85mm lenses but for the wide and ultra-wide lenses, it triggers vignetting correction in the M8. A number of us have been hand-coding these lenses using felt-tip ink markers on the rear bayonet flange but this is a bit “hit and miss” plus it wears off after the lens has been removed and replaced a few times. In addition, a substantial number of ZM21 owners using this lens on a Leica M8, would like to replace the rear bayonet with that from the ZM28 lens, as unless the 28/90 frame line is selected on the M8, it will not recognise a 21mm lens has been mounted. At the moment we have to do this manually on each exposure by use of the frame selector lever. From trials, we know that the 28mm bayonet is a direct fit on the ZM21 and is a simple job of a few minutes to change.

 

 

Best regards

Wilson Laidlaw

 

Dear Mr. Laidlaw,

 

thanks for your request.

Well, it´s the first time that we hear a statement like yours about the grip moulding lines. We will consider it.

About the Leica 6 Bit code: of course this is mainly a licence question. But on the other hand, several tests show the the shading compensation of the M8 camera does too much of correction, resulting that the images appear unnatural. So for most wide angle lenses a moderate manual shading correction of the image seems to be better.

Replacing the bayonet mount of the Biogon T* 2,8/21mm ZM lens:

The only practical solution is to use the 24mm framelines in a Leica M8:

The framelines called "24mm framelines" in the viewfinder of an M8 are the correct framelines for a 24mm lens mounted on this camera, the " 28mm framelines" in the viewfinder show the correct angle of view of a 28mm lens mounted on the camera and so on...

So it is impossible to see framelines in a M8 the correspond exactly with the angle af view of a 21mm lens mounted on this camera. However, an automatical switching to the 24mm framelines in the M8 may be a practical solution.

 

We can offer you the following service:

Exchanging the bajonet mount of your lens with a 35mm lens bajonet mount (so that the framelines 24mm and 35mm can be seen in the viewfinder of the M8). The Price of this service will be Eur 60,-

(Price plus shipping costs excluding VAT).

 

We don´t recommend our customers to exchange the bajonet mount by themselves or at a non-authorized repair center because warranty will be lost in this case. Special measuring equipment is required to adjust the lens after re-assembling.

Unfortunately, we don´t have the spare parts available at the moment. So it will take a few weeks until we can service your lens.

 

We will give you further information when the spare parts are on stock.

 

 

Best Regards

 

Carl Zeiss AG

Geschäftsbereich Photoobjektive / Camera Lens Division

Internationaler Vertrieb / International Sales

Kundensupport / Customer Support

 

Bertram Hönlinger

 

Telefon/Phone: ++49 7364 20 3398

Fax: +49 73 64 20- 40 45

e-mail: hoenlinger@z-extern.com

http: Willkommen bei Photo- und Filmobjektiven von Carl Zeiss