The EF-S lens line-up continues to expand. This month's Technical Report introduces the EF-S60mm f/2.8 Macro USM, a compact, lightweight medium telephoto macro lens, and the EF-S18-55mm f/3.5-5.6 II USM, a standard zoom lens ideal for the EOS Kiss Digital N. Both are dedicated to EOS Digital cameras compatible with EF-S lenses and were released in February 2005.
Compact, lightweight medium telephoto macro lens for EF-S lenses compatible EOS Digital cameras
EF-S60mm f/2.8 Macro USM
Photo 1 EF-S60mm f/2.8 Macro USM
Photo 1 EF-S60mm f/2.8 Macro USM
Concept of development
The EF-S60mm f/2.8 Macro USM is a compact, lightweight medium telephoto macro lens for EOS series cameras compatible with EF-S lenses.
The development concept is as follows:

Capable of life-size (1x) macro shooting without accessories

Compact, lightweight design enabled by taking advantage of the smaller image circle and shorter back focus

3-group floating inner focusing system with fixed overall lens length

The longest working distance in its class


Feature 1: More compact, lightweight body with life-size macro capability
The EF-S60mm f/2.8 Macro USM's optical design takes advantage of the smaller image circle and shorter back focus of EF-S lenses, enabling life-size macro photography without accessories as well as a lighter, more compact body.
The focal length is equivalent to 96mm in full-frame 35mm format.


Feature 2: Inner focusing (3-group floating system) to achieve superb image quality over the entire shooting area
The 4-group optical system consists of 12 elements in 8 groups. In the inner focusing 3-group floating system, the second, third and fourth groups move asymmetrically on individual tracks when focusing (see Fig.1).
Fig. 1 Optical System and Movement of Lens Groups When Focusing
Fig. 1 Optical System and Movement of Lens Groups When Focusing

This system helps achieve very good compensation of aberrations that occur during focusing, delivering excellent quality images with high resolution and contrast throughout the entire focusing range (see Fig. 2).
The lens length does not change and the front ring does not rotate or move when adjusting focus, improving the operation with accessories such as circular polarizing filters and macro flashes.

Fig. 2 MTF Characteristic Charts Fig. 2 MTF Characteristic Charts
Thick lines: 10 lines/mm; thin lines: 30 lines/mm. The darker black lines represent the MTF characteristics at maximum aperture; the blue lines at f/8.
The solid lines trace the radial S (sagittal) curve, while the broken lines trace the tangential M (meridional) curve.


Feature 3: The longest working distance in its class
The working distance of 90 mm at life-size (1x) macro shooting, the longest its class*, enables the user to concentrate on shooting without fear of touching the delicate subjects such as flowers or insects with the tip of the lens.
* Among all the macro lenses with focal length of 50-60 mm and life-size shooting capability without accessories as of April 1, 2005.


Feature 4: Specification optimized for digital SLR cameras
The EF-S60mm f/2.8 Macro USM has element shape and coating optimized for use with a digital SLR camera. As a result, it successfully realizes both good color balance and minimization of ghost and flare attributable to surface reflections from the digital imaging element.


Other Features
Compatible with flashes for close-up shooting
With Canon's flashes for close-up shooting (Macro Ring Lite MR-14EX or Macro Twin Lite MT-24EX), E-TTL autoflash close-up shooting is possible (see Photo 2, 3 and 4).
Figure 3, 4 and 5 show the autoflash distance ranges of the MR-14EX and MT-24EX.
Photo 2 Both lights used
Photo 2 Both lights used
Photo 5 Macro Twin Lite MT-24EX Attached
Photo 3 Left light used Photo 4 Right light used
Photo 3 Left light used Photo 4 Right light used Photo 5 Macro Twin Lite
MT-24EX Attached
Fig. 3 Guide of Autoflash Control Distance Range of MR-14EX

Fig. 3 Guide of Autoflash Control Distance Range of MR-14EX
Fig. 4 Guide of Autoflash Control Distance Range and Flash Head Setting Angle of MT-24EX
Fig. 4 Guide of Autoflash Control Distance Range and
Flash Head Setting Angle of MT-24EX
Fig. 5 Guide of Flash Head Setting Angle Fig. 5 Guide of Flash Head Setting Angle


Silent, high-speed AF
The inner focusing system, ring-type ultrasonic motor (USM), high-speed CPU and optimized AF algorism contribute to silent, high-speed autofocus.

Manual focusing enabled even in AF mode
The EF-S60mm f/2.8 Macro USM has full-time manual focusing that allows manual focus after one-shot AF operation without leaving AF mode.

Environmentally friendly lead-free glasses
The optical system contains only environmentally friendly lead-free glasses.

Dedicated cylindrical hood with superb light blocking
The ET-67B, a cylindrical hood dedicated to this lens, has superior antireflection flocking on the inner surface. It is very effective in keeping unwanted light out of the lens.

Mounting prevention for incompatible EOS cameras
The EF-S60mm f/2.8 Macro USM is constructed to prevent it from being mistakenly mounted on an EOS series camera that is not compatible with EF-S lenses. In addition, a rubber ring on the rear prevents damage to the camera's mirror box even if the user attempts to mount the lens on an incompatible camera.


Tips on macro shooting
Macro shooting requires precautions different from those for standard shooting such as snapshots and portraits, so the following tips are recommended:

Focusing and camera shake prevention
As depth-of-field is shallow at macro distances, extreme caution is required for focusing.
For autofocusing, take advantage of Full-time Manual Focusing for more precise control after focus is achieved.
To minimize the effects of camera shake, it is recommended to use a stable tripod and the remote switch.

Exposure compensation
As lens extension is longer during macro focusing, the difference between the nominal
f-number (the aperture displayed by the camera) and the effective f-number (the actual aperture) becomes larger. With TTL, the light passing through the lens determines exposure so compensation of difference between the nominal f-number and the effective f-number is not required, but when a separate light meter is used, exposure compensation is necessary. Table 1. shows the exposure compensation (exposure stops) for macro extensions.
Magnification  1:5  1:4  1:3  1:2  1:1.5  1:1 
Effective f/No.  3.50  3.66  3.89  4.39  4.86  5.84 
Exposure factor (stops)   1/2-stop increments  + 1/2  + 1/2  + 1  + 1  + 1 1/2  + 2 
1/3-stop increments  + 2/3  + 2/3  + 1  + 1 1/3  + 1 2/3  + 2 
Table 1 Exposure Compensation of EF-S60mm f/2.8 Macro USM
Proper exposure also varies depending on the subject, regardless of TTL or a separate light meter. It is thus recommended to take multiple shots with different exposure settings, taking advantage of digital ''instant replay''. Additionally, it is advised to use aperture-priority AE (AV) mode or manual exposure (M) mode for easy compensation of depth-of-field and exposure.
Photo 6 Sample image shot in macro shooting area (EOS 20D, 1/100 sec., f/2.8, ISO200) Photo 7 Sample image shot in standard shooting area (EOS 20D, 1/320 sec., f/4, ISO200) Photo 8 Sample image shot in macro shooting area (EOS 20D, 1/80 sec., f/2.8, ISO200)
Photo 6 Sample image shot in macro shooting area (EOS 20D, 1/100 sec., f/2.8, ISO200) Photo 7 Sample image shot in standard shooting area (EOS 20D, 1/320 sec., f/4, ISO200) Photo 8 Sample image shot in macro shooting area
(EOS 20D, 1/80 sec., f/2.8, ISO200)

Compact, lightweight standard zoom lens ideal for the EOS Kiss Digital N
EF-S18-55mm f/3.5-5.6 II USM
Photo 9 EF-S18-55mm f/3.5-5.6 II USM
Photo 9 EF-S18-55mm f/3.5-5.6 II USM
Concept of development
The EF-S18-55mm f/3.5-5.6 II USM (see Photo 9) is a compact, lightweight standard zoom lens ideal for the EOS Kiss Digital N.
While inheriting its optical mechanism from the EF-S18-55mm f/3.5-5.6 USM, well-received for its superior image quality as well as light weight and compactness, the EF-S18-55mm f/3.5-5.6 II USM is newly designed for greater sophistication with a more compact feel.


Features
New exterior design
The EF-S18-55mm f/3.5-5.6 II USM is newly designed for improved compactness and sophistication compared with the previous model EF-S18-55mm f/3.5-5.6 USM.
The major changes are the shape of the zoom ring rubber grip and the tapered area at the front of the lens.

Superior image quality
Employing an element with two precise aspherical surfaces, the EF-S18-55mm f/3.5-5.6 II USM achieves excellent correction for aberrations that occur during zooming, delivering superior image quality as well as minimizing flare and ghost prevalent in digital SLR camera photography.
* The article on the EF-S18-55mm f/3.5-5.6 USM in January 2004 issue of Technical Report shows the detail of the optical system and MTF Characteristic Charts.

Minimum focusing distance of 0.28 meters
The minimum focusing distance is 0.28 meters through the entire zoom range.

Circular aperture for attractive bokeh effects
The circular aperture of the lens provides attractive blur effects (bokeh).

Silent, high speed AF
The ultra small micro USM II and AF drive optimized for the EOS Kiss Digital N contribute to high speed AF performance.

Environmentally friendly lead-free glasses
The optical system contains only environmentally friendly lead-free glasses.


This issue of the Technical Report introduces two new lenses added to the EF-S lens line-up. Table 3 shows the major specifications of each lens.

Table 2 Data when used with the Extension Tube EF 12 II / EF 25 II
EF-S60mm f/2.8 Macro USM
Settings Focusing distance (mm) Working distance (mm) Magnification (x)
EF12 II Near distance 207 125 1.28
Far distance 445 363 0.20
EF25 II Near distance 215 117 1.61
Far distance 289 192 0.44
EF-S18-55mm f/3.5-5.6 II USM
Settings Focusing distance (mm) Working distance (mm) Magnification (x)
WIDE TELE WIDE TELE WIDE TELE
EF12 II Near distance 135 215 0.4 79 0.81 0.57
Far distance 139 377 8 244 0.66 0.23
EF25 II Near distance Incompatible 201 — 50 — 0.92
Far distance 265 117 0.51
Table 3 Major Specifications
  EF-S60mm f/2.8 Macro USM EF-S18-55mm f/3.5-5.6 II USM
Focal Length/Aperture 60mm f/2.8 18-55mm f/3.5-5.6
Picture Size 15.1 x 22.7mm 15.1 x 22.7mm
Lens Construction 12 elements in 8 groups 11 elements in 9 groups
Angle of View Diagonal 24°30' 74°20' - 27°50'
Vertical 14°10' 45°30' - 15°40'
Horizontal 20°40' 64°30' - 23°20'
Minimum Focusing Distance 0.2m 0.28m
(at all zoom focal lengths)
Maximum Magnification
/Field of View		 1.0x, 15.1mm x 22.7mm 0.28x, 54.0mm x 81.0mm
Minimum Aperture f/32 f/22-36
Filter Diameter ø52mm ø58mm
Gelatin Filter Holder

III: Compatible
(max. of 6 hoods can be used)

III: Compatible
(hoods cannot be used)

IV: Compatible
(max. of 6 hoods can be used)

 IV: Compatible
(hoods cannot be used)
Maximum Diameter x Length ø73 x 69.8mm ø68.5 x 66mm
Weight 335g 190g
Hood ET-67B EW-60C
Lens Case LP1016 LP814
Price 57,000 yen
(including lens case and hood, tax excluded) 		30,000 yen
(tax excluded)