[es] - AF performance vs 8 competitors

StORM48

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^{10.11.2008. u 12:56 - pre 200 meseci}

Citat:

Source: fotoMAGAZIN (Germany), Nr. 5/2008, p30ff

Gear:

* 40D: Canon 40D + EF 70-200 f/2.8 L IS USM (3230,- € German list price)
* 1D: Canon 1D-mkIII + EF 70-200 f/2.8 L IS USM (6390,- € German list price)

* 1Ds: Canon 1Ds-mkIII + EF 70-200 f/2.8 L IS USM (10290,- € German list price)

* D80: Nikon D80 + Nikkor 70-200 f/2.8 VR G IF-ED (3260,- € German list price)

* D300: Nikon D300 + Nikkor 70-200 f/2.8 VR G IF-ED (4120,- € German list price)
* D3: Nikon D3 + Nikkor 70-200 f/2.8 VR G IF-ED (7140,- € German list price)

* E3: Olympus E3 + Zuiko 50-200 f/2.8-3.5 ED SWD (3100,- € German list price)

* K20: Pentax K20D + DA* 50-135mm f/2.8 ED IF SDM (2180,- € German list price)
* A700: Sony Alpha 700 + 70-200 f/2.8 G SSM (3800,- € German list price)

(Order and prices as chosen by original print, K20 has best price in the field due to affordable DA* lens.)
Result (Test #4 -- Relative ratio of out-of-focus shots, central AF):

1. A700: 2.1 %
2. 40D: 6.4 %
3. D3: 9.2 %
4. D300: 10.0 %
5. 1D: 11.7 %
6. 1Ds: 14.3 %
7. E3: 17.8 %
8. D80: 23.2 % (but 10.7 % with multi-field AF)
9. K20: 25.6 % (and 43.6 % with multi AF)

Result (Test #3 -- Absolute number of in-focus shots, central AF):

1. 1D: 30.2 images
2. D3: 21.6 images
3. 40D: 20.6 images
4. A700: 15.3 images
5. 1Ds: 15.0 images
6. D300: 13.5 images
7. D80: 8.6 images (10.7 with multi AF)
8. E3: 7.4 images
9. K20: 5.8 images

3.7 images (with multi-field AF, other multi-field AF results ommitted here)

Method:

* Continous shots (burst, continous AF aka AF.C) of an approaching red Chrysler PT cruiser, tripod mounted and panned centering onto radiator grill. Photograph besides road. Road straight. Test done on a closed military airport.
* Controlled speed: 100 km/h (62 mph).

Starting photo burst at 100m distance (109 yards, 328 ft). Stopping when passing by.
Time to drive through 100m: 3.6s.
* Focal length: 35mm equivalent of 200mm (135mm for K20).
* Aperture: f/2.8 or widest (Olympus).
* Shutter: 1/320 or shorter.
* Light: Daylight overcast with grayness. Constant conditions.
* Storage: JPEGs onto Sandisk Extreme III.
* Statistics: 6 series, averaged.

Short verdict (mine):

While the K20 comes out last, it did do its job surprisingly well after reading all the complaints around. We all don't position the K20 as the sport photographer's machine gun and rightly so with only 20% of the available peak performance on the market (1D).

However, it is more than sufficient for everyday photography with ~75% of images in focus.
If I may make my personal scale:

Outstanding: 95-100% (relative ratio of in-focus shots)
Excellent: 85-95%
Good: 75-85%
Average: 25-75%
Poor: 0-25%

Then I get:

* Outstanding: A700
* Excellent: 40D, D3, D300, 1D, 1Ds
* Good: E3, D80, K20

IZVOR

Po ovome, mnoge priče padaju u vodu. Posebno u pogledu odnosa proizvođača, po pitanju kvaliteta i tačnosti AF-a.

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cozmo_im
Ivan Miladinovic
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Re: AF performance vs 8 competitors

^{10.11.2008. u 15:07 - pre 200 meseci}

Ja ovde vidim samo da je 70-200 Nikonov za mrc odsutniji u fokusu od 70-200 Canonovog.

Nista drugo.

Zakljucak je koji? Canon 70-200 L je za nijansu bolji od Nikorra 70-200 ( u sustini jeste naravno i moje misljenje je da je Canonov objektiv bolji ).

Hajmo druge objektive da vidimo... pitanje je kakav bi rezultat bio?

_{[Ovu poruku je menjao cozmo_im dana 10.11.2008. u 16:21 GMT+1]}

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StORM48

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Re: AF performance vs 8 competitors

^{10.11.2008. u 15:51 - pre 200 meseci}

Ma ne, nisi razumeo... nisu u pitanju objektivi, nego neka tela, koja navodno imaju problema sa fokusom.
Objektivi tu imaju učešća, ali samo donekle. Ako oni svoj posao odrađuju kako treba, sve ostale greške dolaze od tela, a to ovde i jeste poređeno.

Naravno, kladim se da bi rezultati varirali u zavisnosti od uslova, načina sprovođenja testa, a u nekoj meri i samih primeraka konkretne opreme itd.

Za mene je ovde (recimo) iznenađujuća superiornost A700. Naravno, taj rezultat može da varira, pa je za očekivati da bi on u realnom radu mogao biti nešto lošiji, ali i nešto bolji. Ipak, sve to mnogo zavisi od niza drugih faktora, ali je prikazan rezultat svakako zanimljiv i dovoljan da u nekoj meri sruši neke non-stop ponavljane mitove.

Ostaje jedino šteta što testom nisu obuhvaćeni i neki noviji aparati, tipa 450D, 50D, D700, D90, ali i 5D, što (obzirom koliko je dugo na tržištu) je malo čudno.

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cozmo_im
Ivan Miladinovic
Direktor svemira i galaktickih
postrojenja
Zemun

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Re: AF performance vs 8 competitors

^{10.11.2008. u 16:32 - pre 200 meseci}

Pa dobro, vidi se da 1Ds je los po tom pitanju, ubija ga 40D svejedno sa istim objektivom. Koliko znam 1Ds je satanizovan zbog toga...

Ali opet bi bilo lepo imati i neke druge objektive, jer izbor stakla nekad je presudan za tacnost i brzinu fokusa.

I meni nije jasno sto nema recimo D700 i 450D?

A za A700 mi se cini da su ga najavili kao aparat sa najboljim fokusom? Ako se ne varam...

1D i D3 su najbolji u testu in focus... za razliku od 1Ds.

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