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LENS CANON 20 F2.8

LENS CANON 20 F2.8
LENS CANON 20 F2.8
Giá: 200.000đ đ/ngày
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*REVIEW

   

 

*      Canon-EF-20mm-f-2.8-USM-Lens

Upon upgrading from a 1.6x FOVCF body to a 1.3x FOVCF body, I was questioning whether I needed to keep the expensive Canon EF 16-35mm f/2.8L USM Lens in my kit. The 20 f/2.8 would be as wide on my 1.3x body as the 16-35mm was on the 10D, just as fast and significantly less expensive. My L zooms cover my needs beyond 24mm. I purchased the 20 f/2.8 and compared it directly to my Canon EF 16-35mm f/2.8L USM Lens (which is very similar both optically and physically to the Canon EF 17-40mm f/4.0L USM Lens) at 20mm Canon-Sigma-20mm-Lenses Pictured above and below from left to right are the Canon EF 20mm f/2.8 USM Lens, Sigma 20mm F/1.8 EX DG Lens and Canon EF 16-35mm f/2.8L USM Lens. Canon-Sigma-20mm-Lenses-with-Hoods My first out-of-the-box impression was that the 20 f/2.8 is nicely built. I would put the 20's build quality between the Canon EF 50mm f/1.4 USM Lens and the Canon EF 85mm f/1.8 USM Lens, but not up to the weather-sealed Canon EF 16-35mm f/2.8L USM Lens' quality. Overall, I am satisfied with the 20mm on this point.
Canon-Wide-Angle-Lenses
Shooting tests quickly revealed the differentiating points between the two lenses. First, the 20 f/2.8 exhibited less barrel distortion than the Canon EF 16-35mm f/2.8L USM Lens. Second, although the 20 f/2.8 was not as sharp as my Canon EF 16-35mm f/2.8L USM Lens, it showed decent center sharpness. At f/2.8, the 20 was slightly soft. At f/3.2 and beyond, center sharpness was good. Unfortunately, that is about the end of the positive aspects of this lens. The 20 f/2.8's corner sharpness was disappointing even on a 1.3x FOVCF body. Color and contrast on the 20 f/2.8 were well below that of the Canon EF 16-35mm f/2.8L USM Lens. There seemed to be a strong purple hue to the 20mm's images. Vignetting is very strong when the 20 f/2.8 is used wide open - even on a 1.3x FOVCF camera. Somewhere between f/4 and f/5.6, the vignetting became reasonable. The following photos are identical auto exposed, auto white balanced shots taken at f/2.8 with these two lenses on a Canon EOS 1D Mark II. Canon-20mm-Lens-Comparison The photo on the left (from the 20 f/2.8) shows obvious vignetting. The purple coloration is also present.   Canon-20mm-Lens-Comparison-2 The photo above is an f/8 comparison. The vignetting is much better, but the photo from the 20 f/2.8 is still slightly underexposed (a consistent issue) - and still purple. The Canon EF 20mm f/2.8 USM Lens exhibits noticeably more flare than the 16-35mm L does (both lenses tested with hoods attached). CA (Chromatic Aberration) is also present in the 20 f/2.8 images. Canon EF 20mm f/2.8 USM Lens and Other Wide Angle Lenses Pictured above and below from left to right are the Canon EF 20mm f/2.8 USM Lens, Zeiss 21mm f/2.8 ZE Distagon Lens, Canon EF 24mm f/1.4L II USM Lens, Canon TS-E 24mm f/3.5L II Lensand Canon EF 16-35mm f/2.8L II USM Lens.
Canon EF 20mm f/2.8 USM Lens and Other Wide Angle Lenses with Hoods Installed So you need an ultra-wide angle lens? My strong recommendation to you - save until you can afford the Canon EF 17-40mm f/4.0L USM Lens or better yet, the Canon EF 16-35mm f/2.8L II USM Lensor one of the other primes lenses referred to in this review. Image quality at 20mm is significantly better with these two lenses. Plus, you get the versatility of a zoom lens with a significantly wider angle focal length available. If all you can afford is the Canon EF 20mm f/2.8 USM Lens, buy it and enjoy it. It will capture memories just fine.      

*IMAGE QUALITY

      2009-04-24_15-27-40 Center 2009-04-24_15-27-40 (1) Mid - frame 2009-04-24_15-27-40 (2) Corner      

*LENS  FLARE

      2010-08-30_12-34-24 f2.8 2010-08-30_12-34-29 f4.0 2010-08-30_12-34-33 f5.6 2010-08-30_12-34-37 f8.0 2010-08-30_12-34-41 f11.0 2010-08-30_12-34-45 f16.0        

*LENS DISTORTION

      2011-03-22_10-47-05
 

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