Konica 28mm Focus On M4
Old 02-02-2017   #1
tony t-stop
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Konica 28mm Focus On M4

Hi there,

I recently got a 28mm Konica Hexanon lens for my Leica M4 - I know its probably not the best quality lens but I can't seem to get the focus to move in the rangefinder when turning the focus ring on the lens - I wondered if anyone knew anything about this? I wondered if it was because the M4 didn't have the 28mm frame lines?

I'm going to shoot some tests which will hopefully give some results but does anyone have experience with this? Is it a problem with the specific lens I've bought - will the photos still be in focus if I make sure the distance is measured correctly??

Thanks,
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Old 02-02-2017   #2
KoNickon
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This is rather a puzzlement. Regardless of whether the M4 has 28mm framelines or not, you should see the rangefinder patch image move as you turn the focus ring. (Obvious questions -- do other lenses focus OK? Have you pushed on the RF roller that engages the lens's focus cam to make sure it's not stuck?) The M-Hexanons are top quality, so I highly doubt the lens is the problem.
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Old 02-02-2017   #3
a.noctilux
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Hello,

If your's is M-Hexanon 28mm like the one on the right in this link:




I own one and it's output is excellent and the physical/optical quality is on top.

So, you may try to figure out simply by turning the focus and look at the rear of the lens if the cam does move.
As KoNickon wrote to figure out for your M4, if the cam move when you push it.

This lens brings 90mm frame lines on M4, and these must move with focus.

Last edited by a.noctilux : 02-02-2017 at 03:49. Reason: link to image
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Old 02-02-2017   #4
Dante_Stella
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It is almost physically impossible for a rangefinder cam not to move with the focus. If you look at the back of the lens, there should be a brass colored ring just inside the lens mount. It moves to and fro when you focus.

That is, unless you are using an adapted SLR version of the 28/2.8 (totally different design) which will have a 55mm filter thread and either AE or EE on the aperture ring of the lens.

Dante
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Old 02-02-2017   #5
KoNickon
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The thought occurred to me that this might have been an SLR Hexanon lens -- but I don't know how that could mount on an M camera without force (and damage).
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Old 02-02-2017   #6
venchka
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Quote:
Originally Posted by a.noctilux View Post
Hello,

If your's is M-Hexanon 28mm like the one on the right in this link:

I own one and its output is excellent and the physical/optical quality is on top.

So, you may try to figure out simply by turning the focus and look at the rear of the lens if the cam does move.
As KoNickon wrote to figure out for your M4, if the cam move when you push it.

This lens brings 90mm frame lines on M4, and these must move with focus.
Yes! That is the lens that I own as well. The hood is in a league of its own. The optical quality is above reproach. The Hexanon works perfectly on my M5, just like my 35mm UC-Hexanon.
Something is not right. I hope you track down the problem.
Wayne

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