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50mm lens has shifted focus. Help.


the warrior

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If your talking about the Summilux I have had two of these lenses and they do focus shift, typically between f1.4 and f2.8. I love this lens and prefer it set up at f1.4 and accept it will be back focussing at f2-2.8 at f4 and more you won't really see a difference.

 

You can't adjust the inherent design, after testing you can only adjust your shooting to suit. Looks quiet alarming on a test sheet, in practice I can deal with it for my style of photography

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If your talking about the Summilux I have had two of these lenses and they do focus shift, typically between f1.4 and f2.8. I love this lens and prefer it set up at f1.4 and accept it will be back focussing at f2-2.8 at f4 and more you won't really see a difference.

 

You can't adjust the inherent design, after testing you can only adjust your shooting to suit. Looks quiet alarming on a test sheet, in practice I can deal with it for my style of photography

 

Yes, this is my experience too!

 

Elmar

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I don't understand the question. You can have the lens adjusted to be accurate at f1.4 or f2 but not both the design focus shifts enough to be 'out' on a digital sensor you can't change that. You will need to send the lens away for adjustment, it's not something you can do yourself

 

Are you sure your body is accurately calibrated

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It is a problem of the lens.

 

A slight displacement of the internal system of brass screw and the group.

 

I do not think it very difficult to adjust myself, I have tools and I'm mechanical precision.

 

But I do not know how it's done.

 

There are similar videos on youtube, but I see nothing of summiux 50mm.

 

Maybe someone knows anything about this ??

 

Some photographs of the process ??

 

Thank you :o

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I think that a bit of confusion has arisen from the OP statement of "shifted focus".... it seems to me he means that lens simply doesn't anymore focuses right, not that it suffers of "focus shift" as we usually intend the term (displacement of the focus plane while stopping down the lens)

 

Warrior, is not impossible to dismount by yourself a Summilux... but reassembly RIGHT is a very critical operation... even if old, it had tolerancing of the 10th of millimeters... if the glass is good, it is better to have it fixed by a lab...recently, to give you an idea, I paid around 240 Euros to have an old Leitz lens dismounted, polished, reassembled perfectly (no spares were needed, and the value of the lens was around 5-6x the cost... not so dissimale from a good old Summilux 50 preasph)

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  • 2 weeks later...
If your talking about the Summilux I have had two of these lenses and they do focus shift, typically between f1.4 and f2.8. I love this lens and prefer it set up at f1.4 and accept it will be back focussing at f2-2.8 at f4 and more you won't really see a difference.

 

You can't adjust the inherent design, after testing you can only adjust your shooting to suit. Looks quiet alarming on a test sheet, in practice I can deal with it for my style of photography

 

No wonder I never found one that was sharp more open then 6.8.

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