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An der A7 II adaptiert: 17mm und 20mm


matthis
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Durch den "UWW-Frust"-Thread motiviert, habe ich die Ecken meiner verfügbaren UWW-Objektive bei 17mm und 20mm verglichen.

 

Zunächst bei f/5.6 und 17mm das Canon 17-40 L, Canon 17 TS-E, Sigma 12-24 (das "alte") und das Contax Distagon 4/18 (C/Y-Mount). Es handelt sich um den Ausschnitt der linken unteren Ecke. Die Belichtung ist jeweils konstant, Unterschiede in der Helligkeit sind Folgen der Vignettierung. Fokussiert wurde mit Kontrast-AF (sofern vorhanden). Als Stativmuffel habe ich auf ein solches verzichtet, weshalb das Motiv nicht perfekt deckungsgleich ist.

 

Wie nicht anders zu erwarten, schwingt das TS-E deutlich obenaus, sowohl in der Schärfe, die bis in die Ecke überragend ist, als auch im Fehlen von Vignettierung.

 

Das Contax Distagon ist bei f/11 ebenfalls sehr scharf, aber vignettiert recht stark. Was man hier im Eckenausschnitt nicht sieht: Bei mittlerer Bildhöhe ist es weniger scharf als in den Ecken und in der Bildmitte. Diese etwas ungewöhnliche Charakteristik ist kein Fehler meines Exemplars, sondern bestätigt sich im publizierten Datenblatt von Zeiss.

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Edited by matthis
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Hier nun dasselbe bei f/11.

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Nun das ganze noch einmal bei f/5.6, diesmal aber mit aktiviertem Korrekturprofil von Adobe (ausser Contax Distagon) und aktivierter CA-Korrektur:

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Und noch einmal mit Korrekturprofil bei f/11.

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Nun kommen wir zu 20mm, zunächst bei f/5.6. Hier treten wiederum das Canon 17-40 L und das Sigma 12-24 an, dazu das "Sony FE 21mm f/2.8" (d. h. das Sony FE 28 f/2 mit zugehörigem UWW-Konverter), das Pentax-UWW-Zoom smc-FA 4/20-35mm und das Pentax smc-FA 2.8/20mm.

 

Hier zuerst wieder ohne Korrekturprofile, mit Ausnahme des Sony, das (mit Konverter) derart stark verzeichnet, dass es keinen Sinn macht, das Profil abzuschalten. Das Sony ist hier somit im Vorteil (und schlägt sich ganz ordentlich, wie ich finde).

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Dasselbe in f/11.

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Und nun noch einmal mit Korrekturprofilen, bei f/5.6. Für die beiden Pentax-Optiken gibt es kein Profil (daher nur CA-Korrektur). Im Fall des Sony handelt es sich noch einmal um das gleiche Foto wie oben.

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Und zum Schluss noch bei f/11 mit Profil/CA.

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Das Canon TS-E 17mm überzeugt auch am Bildrand. Alle anderen Objektive haben teilweise recht deutliche Einschränkungen, mag sein dass mein Exemplar des Canon 17-40 L besonders schlecht war, aber es überzeugt auch bei Deinem Vergleich gegenüber wesentlich betagteren Objektivkonstruktionen nicht.

Ich persönlich finde auch das Sony FE mit dem UWW-Vorsatz nicht überzeugend, die Bildausschnitte decken sich gut mit meinen Testfotos. abgeblendet auf F 8-11 geht es, aber es ist dennoch von der Schärfe her am Bildrand nicht berauschend. Immerhin ist es ein dedicated Converter, also nur für das FE 28mm gerechnet.

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