6 bit coding - Contax G lenses

[mirekti]

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There are three newcomers to my M lens family: G28 Biogon, G45 Planar and G90 Sonnar.

Has anyone 6 bit coded these lenses? I wondered what would be the best profiles for these. My initial thoughts were:

28mm as Elmarit 28 - 011100

45mm as Summicron 50 - 100001

90mm as Tele-Elmarit 90 - 000100

Any thoughts, comments, please?

[mirekti]

...if anyone wants to see what these look like. 90mm not yet converted.

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[jonnyboy]

looking great! where did you get them from?

I'm a fan of those G lenses (have 21, 35, 45 and 90) on my G2. Terrific glasses.

[mirekti]

On 10/15/2023 at 5:36 AM, Al Brown said:

45 would probably be better coded as Summicron-M 35mm f/2 (IV) 000110

A little bit behind on this thread and already coded it as Summicron 50mm, but why would you think so?
 

[mirekti]

90mm came in today. I am so bad at this, but the camera doesn't think so, it recognizes my coding masterwork.

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[mirekti]

90mm came in today.

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I am so bad at this, but the camera doesn't think so, it recognizes my coding masterwork.

Edited November 9, 2023 by mirekti

[Carlos cruz]

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On 10/14/2023 at 10:37 PM, mirekti said:

...if anyone wants to see what these look like. 90mm not yet converted.

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Is it a rework-lens from Taiwan? Did you do conversion yourself,  I am curious is it possible to have the lenses focus closer than 0.7 m?

[mirekti]

5 hours ago, Carlos cruz said:

Is it a rework-lens from Taiwan? Did you do conversion yourself,  I am curious is it possible to have the lenses focus closer than 0.7 m?

Yes. I did 28 and 45 myself. Received 90mm converted. I was told 90mm couldn't be adjusted and it would be a hit or a miss. The only guarantee was it focuses "correctly" on his (seller's) M camera. When I received it, mine was front focusing, but I took it apart and luckily removing a single shim fixed it for me.

Not sure about closer than 0.7m. The lenses certainly (at least 28 and 45) can focus closer in their original form.
I am happy it stops at 0.7 so I can use the RF precisely, but for those would would want to use them with SL (or any other mirrorless) could benefit from closer focus.

[Carlos cruz]

1 hour ago, ValerieD said:

I have a fund leader 35G. I like it a lot. Would love to add the 28 and 45, but I can't find any conversion kit anymore. Sad face. 

Funleader has somehow disappeared but there are conversion sets from “rework-lens” on ebay. 

[Carlos cruz]

On 10/15/2023 at 12:36 PM, Al Brown said:

45 would probably be better coded as Summicron-M 35mm f/2 (IV) 000110

Sorry for excavating old thread, I’ve tried to find any leads on how to best code planar 45,  your suggestion to code it as 35 or s interesting but I can’t find any sources for that or comprehend logic behind it, if I have a set of g lenses how I am supposed to code planar 35, same as 45?