Canon FD Resources - Medium Telephoto Zoom lenses
New FD 70-150mm f/4.5 & New FD 100-200mm f/5.6


It is interesting to note that the FD 100-200 mm and its predecessor, Canon's oldest zoom lens, share similar features with the more recently introduced 70-150 mm. Although the 70-150 mm includes focal lengths not found among fixed focal length lenses, the three share similar zoom ratios of about 2x, and covers the popularly used telephoto focal lengths. Among the features are the optical focus compensation systems, push/pull zooming, lightweight and compact construction.

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Simply, a zoom mechanism uses a movable lens for varying the focal length and a compensation lens for correcting the position of the focal point. Either a mechanical compensation method or an optical compensation method is used to move these lenses. The former method uses a cam. The latter method varies the total length of the lens' optical system by linearly sliding the lens barrel.

NOTE:- Info on the NEWER autofocus version

<<<<---- A Hindu devotee performed his pilgrimage. Thaipusam Festival, Batu Caves, Malaysia.
Pix: © 1999, Vincent Thian, an AP photographer. (The Associated Press)

Canon's zoom lenses using the mechanical compensation method have two rotary rings: one for zooming and one for focusing. Only one ring is used for the optical compensation method, however, and this is the method used on the 70-150mm and 100-200mm lenses. Sliding the ring changes the focal length and rotating the ring focuses. It is difficult to say with certainty which system is superior. With the former system, it takes more time to zoom and focus because there are two separate rings. But that way is more convenient for precise artistic framing. While the single ring is faster, its sharp focus may be lost during zooming and precise framing may be marred during focusing. When one of these push/pull zoom lenses is used, a steady grip on the camera is a must to prevent camera-shake during zooming. Interesting enough, during the late seventies, Nikon also introduced an 'economical' version of their Nikkor lenses and termed the new series of lenses as 'series E'. There is a similar zoom (a
75-150mm Series E f/3.5) as with the Canon zoom lens featured here and with a favorable test report, making a lot of Nikon users hyped about its debut. Well, I was not so impressed with that Nikkor zoom and this has resulted in couple of protests from some of the die-hard Nikon users.. Errr.

Although the differences in perspective between the 70-150mm and the 100-200mm is not too marked, the depth of field becomes increasingly shallow as zooming approaches the extreme long focal length end. As the focal length gets longer, increased attention must be paid" to focusing and precautions must be taken against blur caused by camera movement. To increase the depth of field and decrease the effect of possible camera-shake, smaller apertures and faster shutter speeds combination is always encouraged. Deepening depth of field by using smaller apertures, however, inevitably sacrifices fast shutter speeds. Using a tripod is a partial solution, but that defeats the purpose of the design concept of these lenses which is to provide quick operation and portability. The use of a tripod will substantially decrease their value in those respects: To avoid this, practice a steady camera grip and take some additional rolls of high-speed film in your camera bag when you use these lenses.

New FD 70-150mm f/4.5

This lens covers the focal lengths of three fixed focal length telephoto lenses (85mm, 100mm, and 135mm) and zooms between the focal lengths of 70mm and 150mm, which are not found in any fixed focal length lenses. It has a fair zooming ratio of 2.14.

The optical system uses high refraction index glass and cemented lenses which is for countering coma, especially that arising from the part of the optical system responsible for varying magnification.

The lens uses only one ring for both push/pull zooming and rotary focusing. With a simple cam mechanism, the construction of the lens barrel is relatively simple and the need for complicated adjustments during production is not necessary thus contributes to its lower production cost and resulting in a high cost/performance ratio.

Credit: Image courtesy of Mr. Claudio®. who is a collector for Canon photo gear, he also has an Ebay Section as well as maintaining a website on his own where occasionally trading some photo equipment. Image(s) copyright © 2003. All rights reserved. Please respect the visual property of the contributing photographer.


Focal length: 70-l50mm
Aperture ratio: 1:4.5

Lens construction: 9 groups, 12 elements
Coating: S. S. C. (super spectra coating)
Angles of view: Diagonal 34° - 16° 20' Vertical: 19°30' - 9° 10' Horizontal: 29° - 13°40' Distance scale: (m) 1.5 (Magnification 0.06X at 70mm, 0.13X at 150mm) to 20.
OO; (ft) 5 to 70.OO
Focusing mechanism: Rotation of front lens group
Zooming: Push Pull of a single Zoom Ring
Minimum aperture: f/32. A
Diaphragm: Automatic
Filter size: 52 mm
Hood: Built-in Type
Length x max. diameter: 132mm x 63mm
Weight: 530g

New FD 100-200mm f/5.6

This telephoto zoom lens has a small zoom ratio of 2 and covers the focal lengths of three popular fixed focal length telephoto lenses in its range (100mm, 135mm, and 200mm).

The 100-200mm lens has a long history and a solid reputation. The push/pull zooming method and optical compensation system make the lens compact and lightweight with smooth operability and affordable pricing.

Various aberrations such as chromatic aberration and distortion are effectively corrected by using appropriate glass materials as well as limiting the use of lenses to only 8 elements in 5 groups. The lens construction featuring several lens groups, each using 2 lens elements cemented together is also noteworthy. Basically, it is a zoom covering some popular focal length and has a simple but excellent optical design and operational ease with its one touch zoom system at a welcoming cost.

Canon FDN Zoom lens 100-200mm f/5.6 Canon FDN Zoom lens 100-200mm f/5.6 REAR

Focal length: 100-200mm
Aperture ratio: 1:5.6

Lens construction: 5 groups, 8 elements
Coating: S. S. C. (super spectra coating)
Angles of view: Diagonal 24° - 12° Vertical: 14° - 7° Horizontal: 20° - 10° Distance scale: (m) 2.5 (Magnification 0.05X at 100mm, 0.1X at 200mm) to 30.
Focusing mechanism: Rotation of front lens group
Zooming: Push Pull of a single Zoom Ring
Minimum aperture: f/32. A
Diaphragm: Automatic
Filter size: 52 mm
Hood: Built-in Type
Length x max. diameter: 167mm x 63mm
Weight: 610g

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