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i bought a nokton 35mm 1.4 for my M, i noticed that it focus "over infinity"

i mean when i turn the focus ring i see i m at focus at infinity but it still turn a little over and lost the infinity focus (this problem i saw in past using lens with adapters on mirrorrless when the adapter is not exacly size -too much short flange distance- so the lens go over infinity or in the opposite it doesent focus at infinity )

 

its a problem of the lens or to fix the rangfinder coupling on my M?

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  • 2 weeks later...

I think I see what you are saying. I just focused on something in the distance that should be sharp at infinity focus, however it wasn't. I adjusted the focus tab back a little and it is at ininity and is sharp. Voigtlander has made scientific history and has found a place and number beyond infinity. My Mind can't even comprehend how they have done this.

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Same way as lots of other manufacturers over the years for SLR lenses... It allows for variance due to temperature changes. I have seen it more often on cheaper (eg Tamron, Tokina ) long focus lenses but it shouldn't happen with an M mount.

 

(Corrected - thanks Andy ;) )

 

Regards,

 

Bill

 

Sent from another Galaxy

Edited by bill
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... It allows for variance due to temperature changes. I have seen it more often on cheaper (eg Tamron, Tokina ) long focus lenses than on CV I admit.

...

 

Bill, your explanation is correct for SLR lenses (even some Leica R lenses) that allow to focus past infinity, but cannot be true for any rangefinder coupled lens. With an SLR, you are able to actually see when the image is in focus, no matter whether that requires to turn the lens beyond the infinity position or not, but not so with a rangefinder camera. Therefore, every rangefinder lens MUST be adjusted to give true infinity at the indicated infinity position of the lens. Whether the rangefinder image also coincides is again another matter. In other words, the lens may be optically correctly adjusted for infinity, but the rangefinder image may be off, because the rangefinder cam of the lens is maladjusted. Or the rangefinder images may coincide at the infinity position of the lens, but the image may still be out of focus, as the lens may optically be maladjusted.

 

Cheers,

 

Andy

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Andy you are so right and thanks for the clarification. That makes sense of course. I'll amend my original post if I can, and go and stand in a corner ;)

 

Regards,

 

Bill

 

Sent from another Galaxy

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