John,
I have such a lens 5757137 . the chrome mount ring is a bit loose and it
doesn't seem to be the three chrome screws which need tightening. If I set
the focus to infinity and grasp all of the lens in front of the chrome ring
in my left hand and grasp the chrome ring with my right there is twisting
movement , not much; less than 1 mm I suspect but noticeable. Can that be
tightened up easily?
Thanks
Dave
-----Original Message-----
From: John Hermanson [mailto:omtech1@xxxxxxxxxxx]
Sent: 03 September 2011 17:07
To: Olympus Camera Discussion
Subject: Re: [OM] Zuiko 1.8 50mm lenses
Yes, and since that response was from 6 years ago, my response now is
much simpler. Just look for "made in japan" on the name ring.
___________________________________
John Hermanson | CPS, Inc.
21 South Ln., Huntington NY 11743
631-424-2121 | www.zuiko.com
Olympus OM Service since 1977
Gallery: www.zuiko.com/album/index.html
On 8/31/2011 9:07 PM, Chuck Norcutt wrote:
> Sorry, this is the post I should have put here. Also from John on
> October 2, 2000. A bit more info
> -------------------------------------------------------------------------
> According to my parts lists, there are 5 different 1.8s. The last three
> types (type 3,4 and 5) have plastic diaphragm rings& focus rings. If
> you look closely, you can see the parting lines left by the molds.
> These 3 all have the 2 piece lens mount (compare to oldest SC type and
> you'll know what I mean by 2 piece). Type 3 and 4 differ only in that
> there are 2 different part numbers for the lens element group next to
> the rear element, other lens elements in type 3& 4 are interchangeable.
> The other difference in type 3& 4 is that one name ring says MC, the
> other doesn't.
>
> Type 3& 4 started the practice of incorporating the front element, and
> L2 into a sealed unit with the filter ring ((ZD3041).
> Type 5 has the same rear element as type 3& 4, but a totally different
> front group (w/filter ring) (ZJ1669).
> ------------------------------------------------------------------------
> But as Chris said the easiest way to recognize it is the "made in japan"
> on the name ring in front. Often referred to here as the MIJ lens.
>
> Chuck Norcutt
>
>
> On 8/31/2011 9:01 PM, Chuck Norcutt wrote:
>> From John Hermanson on June 7, 2005 from a discussion that was
actually
>> about multi-coating
>> ----------------------------------------------------------------------
>> As I recall, the fast wide angles (21/2, 24/2, 28/2, 35/2) were always
>> MC. Type 1& 2 of 50/1.8 were SC, The last 3 versions of the 50/1.8
>> (type 3, 4, 5) were MC. Type 3& 4 shared all the same parts except
>> element group 2nd from the rear. Type 3 would have MC on the front name
>> ring. Type 4& 5 were MC without any MC marking. Reflections in the
>> front element of MC lenses would be a purplish green in color.
>> ----------------------------------------------------------------------
>> I'm pressing my recall ability here but I think #5 was considered the
>> best but it also supposedly can be subject to sticky diaphragm but the
>> lens is assembled with thread locker and may be extremely difficult to
>> disassemble for cleaning. I have one and it works fine.
>>
>> Chuck Norcutt
>>
>>
>> On 8/31/2011 7:29 PM, deebel wrote:
>>> Can someone remind me of the variations of this lens produced over the
>>> production period and whether any were particularly sought after?
>>>
>>> Thanks
>>>
>>> Dave
>>>
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