Canon Macro EF 180mm f/3.5 L

Canon Macro EF 180mm f/3.5 L

 

이 EF 180mm f/3.5 L 매크로는 캐논의 가장 선명한 렌즈 중 하나다.

픽셀을 분할하고 렌즈를 선명도에 약간의 차이가 보이는 상황에 강제로 넣으려는 경우, 다른 캐논 렌즈는 이 렌즈만큼 선명하지 않다.

 

Canon의 MTF 곡선을 기준으로 볼 때, 이 렌즈는

모든 Canon 초광각 렌즈보다 선명하고,

모든 Canon 일반 렌즈, 줌 렌즈보다 선명하다.

 

Distortion   

There is no measurable distortion at all normal distances, and only the slightest invisible pincushion distortion at macro distances.

For more critical use in the macro range, use these values in Photoshop's Lens Distortion tool to remove it:

	FX and 35mm
100' (30m)	0.0
30' (10m)	0.0
10' (3m)	0.0
1:10 (2m/6.6')	-0.25
1:5 (1.2m/3.99')	-0.3
1:2 (0.66m/2.15')	-0.5
1:1 (0.48m/1.56')	-0.4

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Macro exposure compensation     performance  

 

All lenses change their effective f/number as focussed more closely. It's only noticeable when we focus lenses to macro distances.

This is this lens' weakest point. This lens does not compensate automatically for the the normal exposure loss that almost all macro lenses exhibit as focussed more closely.

This makes no significant difference at normal distances, but at macro distances can make lenses a stop or two slower than they are at infinity. Look through the finder, and you'll see the image get darker as focused much closer. This is normal.

This is no problem for shooting in any automatic mode as most people do at normal distances, but will result in different exposures as you change distance once you set a fixed exposure manually as pros often do in macro or studio settings.

I shoot most of my macro in a studio with studio strobes at fixed power in manual exposure. With this lens, I have to change my aperture setting slightly as I change distance to keep my exposure constant.

This is why I prefer to shoot the Nikon in my studio, since Nikon cameras and lenses compensate for this automatically — even in manual exposure. If I set f/22 on this Canon lens and focus more closely, it can be a stop or more underexposed, while with Nikon cameras and lenses, they compensate and give the same exposure.

Don't let me scare you away from this lens since most of you always shoot in automatic — or with TTL flash, but if used with everything set manually and you need to change distances significantly, you will have to change your aperture setting to get the same effective exposure at each distance.

Repro Ratio	Stops lost	Effective maximum f/stop
∞	0	f/3.5
1:10	0.12	f/3.8
1:5	0.35	f/4
1:3	0.6	f/4.3
1:2	0.85	f/4.7
1:1.5	1.0	f/5
1:1.2	1.25	f/5.4
1:1	1.46	f/5.8

You can ignore this with auto and manual TTL exposure, but it must be heeded when used with manual studio strobes or external exposure meters.

See more on page 8 of Canon's manual.