Thanks! Considerate of you to develop this post. Jack
--- Patrice LACOUTURE <[EMAIL PROTECTED]> wrote: > 2006/2/19, Thibouille <[EMAIL PROTECTED]>: > > Interrested? > > Got the latest one and there are quite a number of lenses tested. > > There's discussion about this on dpreview forum but if you wish I > > could scan the sheets? > > Here is a synthesis for primes for those who can't/don't want to buy > the magazine issue. > > In this text, I voluntarily grouped lenses with similar figures > together. One should still buy the issue to get actual graphs and > measured figures. > > Sorry, nothing about zooms (yet). Too many figures, too hard to > synthesize. > Only the 16-45 f/4 ED AL stands out as being particularly > disappointing, because of very poor sharpness anywhere but at the > center, all but closed down at f/16! > > Regarding the Primes, then: > > They tested with the AF (except for the A 50 f/1.4, of course), so > there are often poor results at faster diaphs with fast primes (f/2.8 > and faster): in these conditions, the lens is good, but the AF does > not focus correctly enough. They state that their tests with a flat > target tend to increase this focusing issue at faster speeds, which > would be less of a problem for "real photo". > > SHARPNESS: > > All lenses graphs are similar: > - increase from some low figure full open (see note above), to > excellence when stopping down, > - a large, flat section where the quality is excellent (all lenses > show very similar maximum values!!!), both for center and corners. > - slight decrease for higher f/stop values. > > These three parts are noted inc/exc/dec below. > > DA 14 f/2.8 EF (IF): > - inc: < f/8 > - exc: f/8 -> f/16 > - dec: f/22 (slight) > > FA 20 f/2.8: > - inc: f/2.8 > - exc: f/4 -> f/11 > - dec: >= f/16 (slight) > > FA*24 f/2 IF AL: > - inc: <= f/4 > - exc: >= f/5.6 > - dec: NONE > > FA 31 f/1.8 AL Limited: > - inc: <= f/2.8 > - exc: f/4 -> f/11 (humpback, very high at f/5.6-f/8) > - dec: >= f/16 (slight) > > FA 35 f/2 AL: > - inc: <= 2.8 > - exc: >= f/4 > - dec: NONE > > DA 40 f/2.8 limited: > - inc: f/2.8 > - exc: >= f/4 > > FA 43 f/1.9 limited: > - inc: <= f/4 > - exc: >= f/5.6 > - dec: NONE > > A 50 f/1.4: > - inc: only f/1.4 > - exc: >= f/2 > - dec: >= f/16 (slight) > > FA 50 f/1.4: > - inc: <= f/2 > - exc: >= f/2.8 > - dec: NONE > > FA 50 f/1.7: > - inc: <= 2.8 (2.8 excellent at center, not at corners) > - exc: >= 4 > - dec: NONE > > F 50 f/2.8 Macro > - inc: f/2 > - exc: f/2.8 -> f/11 (a bit less good as other primes) > - dev: >= f/16 (suite noticeable, f/22 is not as good as f/2.8) > > D FA 50 f/2.8 Macro: > - inc: <= 5.6 > - exc: >= f/8 > - dec: f/22 (slight) > > FA 77 f/1.8 limited: > - inc: <= 2.8 (center excellent at f/2.8) > - exc: >= f/4 > - dec: f/22 (slight) > > FA 85 f/1.4 IF: > - inc: <= 2 > - exc: >= 2.8 > - dec: NONE (f/22 VERY slight) > > D FA 100 f/2.8 Macro: > - inc: <= f/4 > - exc: f/5.6 - f/22 > - dec: f/32 > (f/4 and f/32 are still fairly good) > > FA* 200 f/2.8 IF ED: > - inc: <= 5.6 (5.6 almost as good ad f/8) > - exc: f/8 -> f/22 > - dec: f/32 > > VIGNETTING: > > All lenses have unnoticeable vignetting for all but the two faster > stops, where it goes up to about 0.3 f-stop. > > Exceptions: > - DA 14mm f/2.8 ED IF: almost 1 f-stop at f/2.8, 0.2 f-stops from > 5.6 and up. > - FA 20mm f/2.8: 0.5 f-stop at f/2.8, then 0.2 f-stop. > - A 50mm f/1.4: only f/1.4 has a bit of vignetting. It drops to 0 > from f/2 and up. > > CHROMA ABERRATION: > > They split neatly into 4 categories: > - Excellent: FA 50 f/1.7 > - Better: FA 31, D FA 50 macro, FA 77, > - Average: FA 35, FA 85, D FA 100, FA 200 > - Not as good: DA 14, FA 20, FA 24, FA 43; A 50 1.4, FA 50 1.4, F > 50 Macro, FA 85 > > DISTORSION: > > - Unnoticeable: D FA 50 Macro, FA 77, FA 85, D FA 100 macro, FA 200 > - 50mms: all non-macro 50mm have very low distorsion 0.10 to 0.17 > - A bit higher (0.21-0.26): F 50mm Macro, FA 43, DA 40, FA 35 > - Worse: FA 31, FA* 24, DA 14 > - Huge (0.83): FA 20 (but less so with APS-C sensors). > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
