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Frage: Justage eines Schraubgewinde-Objektives, mit M-Bajonett-Adapter

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Liebe erfahrene Leica-Freunde,

ich besitze ein "älteres" Voigtländer Nokton 50mm f1.5 Objektiv mit Schraubgewinde, welches ich mit einem M-Bajonett-Adapter (ebenfalls von Voigtländer) an meinen analogen und digitalen M-Kameras nutze.

Leider hat dieses Objektiv an der digitalen M (240) ein bisschen "Backfocus", die tatsächliche Schärfe-Ebene liegt also weiter hinten als das Schnittbild im Entfernungsmesser. Oder konkret formuliert: wenn ich im Messsucher auf die Augen fokussiere, dann sind auf dem Foto die Augen etwas unscharf, die Schläfen oder Ohren jedoch scharf abgebildet.

Nun die Frage an die erfahrenen Leica-Besitzer und -Bastler: Wie kann ich diesen Backfocus am Objektiv korrigieren / justieren? (am Messucher der Kamera liegt es zum Glück nicht, denn andere Objektive fokussieren ja korrekt)

Ich bedanke mich sehr herzlich für hilfreiche Tips, Tricks und Hinweise.



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Dann würde ich an deiner Stelle prüfen, ob nicht möglicherweise der Adapter die Ursache des Problems ist. Am besten geht das mit einem zweiten Adapter ... und zwar einem Original-Leitz-Leica-Adapter. Vielleicht findet sich ja in deiner Gegend ein freundlicher Händler oder ein freundlicher Forent, der dir leihweise einen solchen Adapter zur Verfügung stellt. Erst wenn dein (mutmaßlich zu dünner Adapter) als Fehlerquelle ausscheidet, würde ich das Thema "Justage des Objektivs" angehen.

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Danke XOONS für den Tip.

Du vermutest also, daß mein Adapter "zu dünn" ist, das führt zu Backfocus. Wenn ich also den Adapter ein bisschen "dicker" mache, zum Beispiel durch aufkleben einer Folie zwischen Adapter und Objektiv, dann könnte das Problem korrigiert sein... das werde ich mal ausprobieren.


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