[LRflex] Re: Summicron lens on FourThirds (Revisited)

Hi David.  Also need to know now much clearance there is under the chip to
the Leica lens mount.  Some lenses with a lip might not extend back into the
camera far enough that it will be a factor.  

 

From: leicareflex-bounce@xxxxxxxxxxxxx
[mailto:leicareflex-bounce@xxxxxxxxxxxxx] On Behalf Of David Young
Sent: Thursday, March 20, 2008 9:28 AM
To: leicareflex@xxxxxxxxxxxxx
Subject: [LRflex] Summicron lens on FourThirds (Revisited)

 

now (on list or private mail) what lenses you have that have this "lip" or
"ridge" sticking out the back.

Some days ago, I posted the following:




For those who are interested in this sort of arcane stuff...

A photo, showing the problem of the "lip" on a old style 50mm Summicron
hitting the FC chip on the Leica-R to 4/3rds adapter, can be seen at:

HYPERLINK
"http://www3.telus.net/~telyt/lip.htm"http://www3.telus.net/~telyt/lip.htm

This "lip" is, I am sure, on the lens so that when the lens is put down,
rear element down, the element will not contact the surface, thus preventing
scratches.  On a Leica, or even on a Canon, this lip does not get in the
way.  But, with the Focus confirmation adapters for the 4/3rds cameras, when
the lens barrel is moved towards the film plane, the "lip" hits the FC chip.
:-(



Finally, I got a chance to measure the adapter...  (finally found my metric
rule... and some time!) 

The inside "throat" of the Leica R to Four Thirds adapter is 42.5mm.

However, the Focus confirmation chip sticks into this gap a full 6mm, so any
lens with a lip equal or larger to 42.5-12mm = 30.5mm in diameter, will be
unable top focus to infinity,  due to the "lip" or "guard" hitting the FC
chip.

It seems there are only two solutions for such lenses.  Either (a) grind the
lip off - or at least that part of it which interferes with the chip, or (b)
purchase an adapter without the focus confirmation chip. 

To more clearly explain this, I have added a diagram at the bottom of 

HYPERLINK
"http://www3.telus.net/~telyt/lip.htm"http://www3.telus.net/~telyt/lip.htm

If anyone here has a better idea, I'm open to all of 'em!

Cheers!

 

---

 

David Young,       

Logan Lake, CANADA 

 

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Personal Web-site at: HYPERLINK
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"http://tinyurl.com/2amll4"http://tinyurl.com/2amll4

 

 

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