Leica Summilux 35mm not sharp infinite

[trequartista]

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Hello, I am using a brand new Leica Summilux ASPH 35mm with my Leica SL2S. However, I realized that using aperture 1.4, it‘s not sharp when the focus ring is on infinite. I have to move it back maybe 3mm that it gets sharp. Is that normal and how to fix it?

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[jaeger]

Do you mean rotate 3mm back from infinity?  That's a lot!! 

I presume you are using M lenses on SL, so what adapter are you using on the SL, bad adapter does it in my experience.

Edited March 20, 2022 by jaeger

[tommonego@gmail.com]

I had a similar problem with a Pre asph Summilux 35, at almost any f stop infinity wasn't sharp. I finally put it on my CL and found infinity was between 20 and 30 ft on the lens, but on a rangefinder the rangefinder was set correctly to infinity. You should be able to tell where infinity is landing on the lens if your focus peaking is turned on, lens on f1.4 to f2.8. I sent my oldy to DAG for alignment.

[trequartista]

Weird because also my 50mm 1.4 is not sharp at infinite.

[trequartista]

22 minutes ago, jaeger said:

Do you mean rotate 3mm back from infinity?  That's a lot!! 

I presume you are using M lenses on SL, so what adapter are you using on the SL, bad adapter does it in my experience.

I am using the original one from Leica. Is it a bad one?

[jaeger]

5 hours ago, trequartista said:

I am using the original one from Leica. Is it a bad one?

the leica adapter is very accurate, do you have a M body to test out the lens?  bring it back to the dealer and ask for help.

[JMF]

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7 hours ago, trequartista said:

I am using the original one from Leica. Is it a bad one?

I had two original Leica M to L and both were inaccurate on my SL and SL2-S . 
 

[anickpick]

vor 15 Stunden schrieb trequartista:

I am using the original one from Leica. Is it a bad one?

The adapters incorporate a certain margin to make sure that infinity can be reached.

Therefore, lenses can be focused beyond infinity. It's normal. One has to adapt.

[trequartista]

52 minutes ago, anickpick said:

The adapters incorporate a certain margin to make sure that infinity can be reached.

Therefore, lenses can be focused beyond infinity. It's normal. One has to adapt.

I see. Source?

[a.noctilux]

5 minutes ago, trequartista said:

I see. Source?

I don't have source or even SL.

 

Infinity stop on adapters was my concern.

From my experiences on Leica R and co. if this can "explain" the not so accurate adapters.

Long ago, when I used Leica R lenses, some "long" lenses did focus past infinity, explained by the "making room" for temperature change,

so lens ( glass ?)  characteristics changing with temperature.

 

Same explanation when I used Apo-Extender-R (x1.4 and x2) on different lenses, the "infinity" must be fine-tuned in viewfinder, for each lens.

Not because the Leitz/Leica extenders were "loose", but "by design".

[PCPix]

3 hours ago, anickpick said:

19 hours ago, trequartista said:

 

The adapters incorporate a certain margin to make sure that infinity can be reached.

Therefore, lenses can be focused beyond infinity. It's normal. One has to adapt.

I have a 7Artisans M adapter for my SL2 and all my M lenses go ‘past’ infinity by a small degree. They all focus accurately to infinity on the hard stop on the M bodies (also with accurate rangefinder alignment). This will be due to the adapter being very slightly thinner than it would need to be - but I understand why the manufacturer would do this - to allow you to determine the best sharpness at infinity by going past and then returning back, just like regular focussing. Another reason would likely be to allow slightly mis-calibrated lenses to still be able to reach infinity without warranty arguments over ‘your adapter won’t let my lens reach infinity’...

I’ve no experience with the genuine Leica M-L adapter to compare against, but from JMF’s experience with their two original adapters (above) it seems Leica also allows you to go ‘past’ infinity. 

I don't think you need worry about yours trequarista. 

[pgk]

When in doubt refer to the instructions and on page 15 the M Adapter L instructions state: 

A. Focusing

Only manual focusing is available with Leica M lenses.

Note:

The distances set on the lens are slightly shorter when using the adapter than when used directly on Leica M cameras. For example, sharp depiction of a distant subject is achieved immediately before the mechanical infinity stop on the adjusting dial. This is for technical reasons and it not a fault.