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Message |
    
Zcream
Tinkerer
Username: Zcream
Post Number: 2
Registered: 04-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 09, 2010 - 05:01 am: | 
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I took apart a Zenzanon 75mm f2.8 lens.
Here is a tutorial written by someone else.
www.buonaluce.com/Slens.pdf
If you look at Pic 5 and 6, the inner and outer optical elements are shown.
However, you will will find that each one has 2 elements.
I am unable to separate these 2 elements no matter what I try.
Has anyone been able to separate these elements on your samples ?
So the front and the rear element have 2 sets of the 2 notches where we can use the callipers or a machinist divider or a lens spanner wrench.
I tried to take them apart but ending up scratching the glass - so I stopped for a bit.
I am hoping that they are not glued together - but it does look like that.
Any ideas how to proceed ? |
Zcream
Tinkerer
Username: Zcream
Post Number: 3
Registered: 04-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 09, 2010 - 08:42 am: |
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I added a small album with pics of the rear lens element.
picasaweb.google.com/anmol.mishra/RearLens# |
Gez
Tinkerer
Username: Gez
Post Number: 208
Registered: 09-2007
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 09, 2010 - 01:21 pm: |
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According to the promotional literature the EII 75/2.8 is a 6/4 configuration with doublets either side of the shutter blades.
Info on Bronica gear is hard to come by, but over on Mike Butkus' site, www.butkus.org there is a full repair manual for the ERTSi. |
Mareklew
Tinkerer
Username: Mareklew
Post Number: 137
Registered: 03-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 09, 2010 - 04:03 pm: |
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Zcream: you are aware, that these groups are most likely cemented doublets, and separating them will be effectively destructive to the lens?
Marek |
Mareklew
Tinkerer
Username: Mareklew
Post Number: 138
Registered: 03-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 09, 2010 - 04:04 pm: |
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Ooops, should have refreshed the page before posting, Gez beat me to the idea 
Marek |
Zcream
Tinkerer
Username: Zcream
Post Number: 4
Registered: 04-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, July 15, 2010 - 07:05 pm: |
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Are they cemented together or simply thread glued ? I am hoping that they simply have thread glue. thats what was suggested by the link I posted above. |
Zcream
Tinkerer
Username: Zcream
Post Number: 6
Registered: 04-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, August 20, 2010 - 06:00 pm: |
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To finish this thread - I ended up cracking the glass :-( One lens is now dead. |
