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120 / 220 film RF's 120 / 220 format rangefinders including Fuji, Koni-Omega, Mamiya Press, Linhof 6x7/6x9 cameras, Mamiya 6/7 among others, but excluding the 120 folders and the Voigtlander 667 cameras that have their own forums.

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Mamiya 6 lenses
Old 01-24-2019   #1
fadedpastels
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Mamiya 6 lenses

I have the 75mm but unfortunately it suffers from doublet separation in the rear element as Precision Camera Works has deemed it. I just received a 50mm I suspect also has this problem. Should I simply keep on looking for a good copy or is this just the outcome of Mamiya 6 lenses down the road? Are Mamiya 7 lenses fairing any better? I might have to try that route but I much prefer the 6.
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Old 01-24-2019   #2
Phil_F_NM
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Never seen that issue in a Mamia 6 lens personally. How you got two of them is amazing odds.
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Old 01-27-2019   #3
fadedpastels
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Would you happen to have the 50mm available to look at? The copy I received also has a browning around the edges of the glass on the front and rear. The 75mm doesn't have that at all.
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Old 01-27-2019   #4
Chriscrawfordphoto
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I had all three Mamiya 6 lenses for several years and never had that on any of mine, either.
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Old 01-27-2019   #5
Phil_F_NM
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Quote:
Originally Posted by fadedpastels View Post
Would you happen to have the 50mm available to look at? The copy I received also has a browning around the edges of the glass on the front and rear. The 75mm doesn't have that at all.
Sorry, I sold all my Mamiya gear a few months ago.

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Old 01-28-2019   #6
ruilourosa
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i tend to see many mamiya lenses with separation issues...
i
i regulary put my universal press lenses in the sun... i do not know if cures or solves the issue but the separation stops...

cheers!!!
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Old 01-28-2019   #7
Phil_F_NM
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Quote:
Originally Posted by ruilourosa View Post
i tend to see many mamiya lenses with separation issues...

i
i regulary put my universal press lenses in the sun... i do not know if cures or solves the issue but the separation stops...

cheers!!!
That sounds like UV and heat slowing a fungal bloom rather than separation. If it's a rainbow pattern it could be stray lubricant working its way between non-cemented elements.
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Old 01-28-2019   #8
ruilourosa
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no, itīs not lubricant... most separations are like that, my attempt in exposing the lenses to uv is beacuse most recent cements are uv cured... and that way stabilizing the cement...

i already fully separated lenses with strong solvents and cemented again with norland optical cement... but thatīs really hard work and a lot of time waiting... i did that with my 180 heliar and some already sold mamiya lenses...
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Old 01-28-2019   #9
Phil_F_NM
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I was just thinking it could also have been stopped by the UV curing cement. Where do you live? Where does the OP live? I'm wondering if the environment may have something to do with separation. I owned my Mamiya 6 kit (2 bodies, all three lenses) for six years and never had an issue. I also have seen a few in that time and have never seen separation. During my time owning them I took them on several cross country trips on the seat of my car, in the heat. Never any problems. I'm not discounting the separation mentioned in this thread, its just that it hasn't been reported before this by many M6 users.
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Old 01-28-2019   #10
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I had a similar issue with a 65 on a M7.

I got the lens cheap due to “light haze” that turned out to be, by my eye, edge separation of one of the internal groups. Still performed fine and I never noticed any ill effects.

Regretfully sold the kit years ago. My most missed camera that I can no longer afford.
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Old 01-28-2019   #11
fadedpastels
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I received both lenses in that state already but I happen to live in a desert. I'm on the search again hopefully 3rd time is the charm to find a decent lens for this system. I am seeing this problem also resides with Mamiya 7 lenses as well which is a shame I was looking into them to see if they would fare any better with no issues being slightly newer. The Mamiya 6 is by far my favorite camera I have used so I'm remaining hopeful but its proving frustrating thus far.
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Old 01-28-2019   #12
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Quote:
Originally Posted by Chriscrawfordphoto View Post
I had all three Mamiya 6 lenses for several years and never had that on any of mine, either.
I have all three lenses too and never had any problems. Strikes me that the lens was improperly stored like in a hot attic or hot car for a while. High temps can trigger lens separation
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