佳能镜头Canon EF 135mm f2 L USMVIP

1、IntroductionThe Canon EF 135mm f/2 L USM is one of the medium tele lenses in the Canon lineup and a member of Canon's prestigious "L" (Luxury) class. A few years ago we performed a test in the APS-C scope already and it turned out to be a superb performer here so it's naturally int

2、eresting to check its qualities on a high resolution full format body as well now. The mechanical quality of the lens is truly excellent thanks to quality materials, tight build tolerances and a smooth and well damped rubberized focus ring. The lens has a "true" IF design so it does not ch

3、ange its physical length and the front element does not rotate during focus operations. The lens accepts all Canon EF tele-converters resulting either in a 189mm f/2.8 (135mm + 1.4x) or 270mm f/4 (135mm + EF 2x) combination. This resulting max. aperture is still fairly large so AF is retained on all

4、 EOS cameras. The AF speed is very fast so the build-in focus limiter isn't really necessary. The AF of the tested sample was highly accurate during the field tests. Thanks to the ring-type USM drive the AF operation is near silent and full-time manual focusing (FT-M) remains possible in one-sho

5、t AF mode. SpecificationsOptical construction10 elements in 8 groups incl. 2x UD elementsNumber of aperture blades8min. focus distance (max. magnification: 1.5)Dimensions83x112mmWeight750gFilter size72mm (non-rotating)Hoodbarrel shaped, suppliedOther features-DistortionsThe Canon lens produces a com

6、paratively mild degree of pincushion distortion (0.5%) which is usually not field relevant. VignettingFull format sensors are difficult beings with respects to vignetting and even the mighty Canon EF 135mm f/2 USM L has its problems here. At around 1.5EV f/2 the situation isn't overly dramatic b

7、ut this degree of vignetting is often visible in field conditions. However, stopping down to f/2.8 solves most of the problem and it's pretty much negligible by f/4. This is a comparatively good performance for an ultra large aperture lens here. . and here's a visual . f/2MTF (resolution)The

8、 EF 135mm f/2 USM L produced very high resolution figures in the MTF lab. The center is already excellent at max. aperture and the border quality is only one mark behind. The quality improves gradually from here on and it reaches its peak around f/5.6 where the resolution is excellent across the ima

9、ge frame. Diffraction reduces the quality level from f/8 onwards but it remains easily on a very good level at f/11. Below is a simplified summary of the formal findings. The chart shows in line widths per picture height (LW/PH) which can be taken as a quantity for sharpness. If you want to know mor

10、e about it you may check out the corresponding Imatest Explanations. Chromatic Aberrations (CAs)Similar to many other high-end tele prime lenses lateral CAs (color shadows at harsh contrast transitions) are very low and really nothing to worry about. BokehThe bokeh (quality of the out-of-focus blur)

11、 is a major performance criteria for a large aperture lens and the EF 135mm f/2 USM L does not disappoint us here. Out-of-focus highlights are exceptionally smooth and even and they are perfectly circular at f/2 - at least a little inward from the corners (they deteriorate a little towards an ellipt

12、ical shape here). The highlights remain pretty much circular at f/2.8 whereas you can spot the first aperture edges at f/4. The quality of the blur is very smooth. All-in-all an excellent quality here. Bokeh Fringing / Longitudinal Chromatic Aberrations (LoCA)Some readers in our forum expressed the

13、hope the this lens is a true APO design. Unfortunately this is not the case. It suffers from LoCAs (non-coinciding focal planes of the various colors), sometimes also called bokeh fringing - as you can see below the halos have different colors - magenta (red + blue) in front the focus point and gree

14、n beyond. Truly "apochromatic" lenses don't show LoCAs but these lenses are very rare and usually insanely expensive. Unlike lateral lateral CAs, LoCAs cannot easily be fixed in post processing. Typical for most fast primes the 135mm L shows a considerable amount of LoCAs at large aper

15、ture settings (which can be field relevant in critical scenes). Stopping down helps to reduce the amount of LoCAs significantly but it takes f/4 to eliminate the problem. Please note that this may not be perfect but even the brand new Zeiss ZA 135mm f/1.8 shows the same characteristics here. Move th

16、e mouse cursor over the f-stop marks below to observe the respective LoCAs f/2 Sample ImagesHere're some sample shots taken with the EOS 5D II (RAWs converted via CaptureOne). Click on a thumbnail to view the original file (opens in a separate window). Need Unlimited photo storage ? Try . . trus

17、ted by PhotoZone! MakeCanonModelCanon EOS 5D Mark IIISO Speed200Focal LengthAperture:Exposure1/2000sMakeCanonModelCanon EOS 5D Mark IIISO Speed200Focal LengthAperture:Exposure1/8000sMakeCanonModelCanon EOS 5D Mark IIISO Speed200Focal LengthAperture:Exposure1/2000sMakeCanonModelCanon EOS 5D Mark IIIS

18、O Speed200Focal LengthAperture:Exposure1/2000sMakeCanonModelCanon EOS 5D Mark IIISO Speed200Focal LengthAperture:Exposure1/2500sMakeCanonModelCanon EOS 5D Mark IIISO Speed200Focal LengthAperture:Exposure1/8000sMakeCanonModelCanon EOS 5D Mark IIISO Speed200Focal LengthAperture:Exposure1/6400sMakeCano

19、nModelCanon EOS 5D Mark IIISO Speed200Focal LengthAperture:Exposure1/8000sMakeCanonModelCanon EOS 5D Mark IIISO Speed200Focal LengthAperture:Exposure1/1600sMakeCanonModelCanon EOS 5D Mark IIISO Speed200Focal LengthAperture:Exposure1/8000sMakeCanonModelCanon EOS 5D Mark IIISO Speed200Focal LengthAperture:Exposure1/1250sMakeCanonModelCanon EOS 5D Mark IIISO Speed200Focal LengthAperture:Exposure1/8000sVerdictThe Canon EF 135mm f/2 USM L is a highly desirable lens with excellent performance figures in most aspects. It is very sharp and contrasty straight from f/2 and it's out