PentaxForums.com - View Single Post - Chasseur d'Images test of 20 Pentax lenses on the K20D

Douglas_of_Sweden · 06-24-2009, 07:12 AM

Originally Posted by thibs

DFA50 macro

Very slight vignetting, aberration almost non existant, distorsion almost null, excellent perofmance from wide open, dimishes slightly at f/11, really noticeable from f/22.

They ask for an SDM version. Superb lens but mechanical quality so-so...

Rating: 5/5

FA*85/1.4

Very noticeable vignetting at f/1.4, less at f/2, never null but negligable upward. slight chromatic aberration, performance OK at f/1.4, very good at f/2 and excellent from f/2.8

Rating 5/5

FA 135/2.8

Vignetting negligable, amazingly low chromatic aberration, no distorsion at all in practice, excellent performance from wide open, diffraction dimishes performance at f/22. They like it very very much

Rating 5/5.

Please Pentax, give us DFA 135/2.8!!!

06-24-2009, 07:12 AM	#47
Douglas_of_Sweden Pentaxian Location: Stockholm Gallery Photos: 51 Posts: 1,308	Originally Posted by thibs DFA50 macro Very slight vignetting, aberration almost non existant, distorsion almost null, excellent perofmance from wide open, dimishes slightly at f/11, really noticeable from f/22. They ask for an SDM version. Superb lens but mechanical quality so-so... Rating: 5/5 *FA85/1.4 Very noticeable vignetting at f/1.4, less at f/2, never null but negligable upward. slight chromatic aberration, performance OK at f/1.4, very good at f/2 and excellent from f/2.8 Rating 5/5 FA 135/2.8** Vignetting negligable, amazingly low chromatic aberration, no distorsion at all in practice, excellent performance from wide open, diffraction dimishes performance at f/22. They like it very very much Rating 5/5. Please Pentax, give us DFA 135/2.8!!!