Modern Classic SLR Series :
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Additional information on Canon EF tele-zoom lens
Canon EF 100~300mm f/4.5~5.6 USM

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Canon EF 100-300mm f/4.5~5.6 USM Tele-Zoom Lens
Marketed: 06.1990; Status:- Current Model (05.2006)

Canon replaced the sluggish AF performer EF 100-300mm f/5.6 AFD in 1990 with an all new EF 100-300mm f/4.5~5.6 USM lens but the Company has retained the EF 100-300mm f/5.6L AFD in the EF lens lineup until the latter was eventually also being replaced with another superbly-spec EF 100-400mm f/4.5~5.6L IS USM in 1998. Until today (05.2006), the compact, lightweight EF 100-300 f/4.5~5.6 USM lens has been kept as the companion alternative tele-zoom for the more exotic IS 100-400 4X zoom. One way or another, even sandwiched among the likes of the many versions of EF 75-300mm (first introduced in 1991 (AFD) and USM (1992), this compact 100-300mm must possesses some good reasons on its own for still be able to find a tiny corner in the EF lens group for such a long spell of time of 15 years in survival without being phased out like the many others. Basically, the lens packs many good elements found in the original EF 100-300mm with more to offer photographers in a light weight, compact dimension for optimum portability; but more importantly, it is a highly affordable tele-zoom with very respectable optical performance. This multi-purpose 3X zoom lens uses a five-group zoom system for maintaining high image performance throughout the zoom range while enabling an extremely compact design.

An Ultrasonic Motor ("USM") was added to improve the weakness found in the earlier AFD f/5.6 slow and noisy autofocusing; internally, Canon designers incorporating a rear focusing design and using the lightweight 4th group for focusing to deliver smooth, quiet, high speed AF performance with most EOS SLR models. Further, the use of the rear focusing system also enabling use of filer attachment accessories such as circular polarizing filters as the front of the lens remains fixed even during focusing/zooming. A close focusing distance of 1.5m/4.9 ft is achieved at all focal lengths (
Max. magnification ratio is 0.20X @300mm MACRO setting), and the ring-type USM ensures manual focusing is possible at any time without switching the focusing mode. The overall improved operability, optical performance and superb lens handling makes it a favorite for many Canon photographers as a secondary tele-zoom in their camera bag.

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Canon EF 100-300mm f/4.5~5.6 USM telephoto zoom lens
It was once treated as a popular consideration when a second lens for many new EOS camera buyers. However, its importance was slowly eroded when the EF 75-300mm slowly gaining its popularity. The new alternative EF optical zoom has a wider angle of view at its shortest focal length of 75mm as compared to the more restrictive 100mm startup focal length.

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As the Canon 75-300mm lens type has practically evolved to its 4th generation to this stage and this long time favourite of 100-300 Canon Zoom which personally I think carries with a more rigid feel than comparing 75-300. Basically, the 100-300 USM zoom is still remained unchanged since its inception a decade ad a half ago. Whatever it is, if you can live with this slight drawback, a good, used condition EF100-300 f/4.5~5.6 USM which normally retailed between USD180-280-00 would be a very logical entry. If budget is still your primary consideration, by all means, revert your choice back to older options in the 75-300mm which has a tendency of flooding the used equipment markets. Frankly, even some third party lenses such as the Tokina AF 100-300mm f/4 AT-X II; Sigma APO 100-300mm F4 EX DG HSM and other such as Tamron or Vivitar all have this specific zoom range in their respective labels which comes as an option for consideration to Canon's original. I don't like to associate or mislead others to think the Canon EF 100-300mm f/4.5~5.6 is a Canon modern classic but it serves different aspect in user's expectation and requirement as a a truly high quality telephoto zoom lens; as I said, if you do not do plenty of serious photography, this lens comes in handy as well as it is highly affordable option for many weekend photographers. Anyway, put this lens in a hand of a creative photographer, regardless it is film based or digital, I would think it can spring some surprises in achieving some exciting visual works - after all, I think it is the person who controls an image formation process rather than vise-versa.

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The weakness of this lens is with its variable apertures, at the longest setting, the aperture drops to f/5.6 which means to say, it may requires plenty of ambient light to substitute its weak light gathering power; use of tripod or other support is a good idea to neutralize this (an alternate way is to use artificial illumination such as a flash lights OR change to a moderate speed film type such as ASA 400; digital SLR user may just set the camera's sensitivity to higher ISO); on the other hand, the convenience of a zoom in its ability to continuous altering perspective changing plus the ability to isolate a section of a scene that attracts your attention is its main strength as a tele-zoom; it is destined to work in tandem with another wideangle zoom lens to cover from near to distance scene with just two lenses in lightest possible package - the dual lenses configuration in setting up this manner is an ideal way prepare for traveling, mountain tracking, local sports events and even family pictures such as candid, gathering and so forth. The macro provides an extension should circumstances requires applying some close-up photography.

For those who may be very particular on image performance, you can try a few of this suggestive link as purchase references: Some Online Reviews are available at Digital;; combined mixed reviews by users at etc.

Technical Specification for Canon EF 100-300MM f/4.5~5.6 USM Telephoto-Zoom: -

Type: - Autofocus TELEPHOTO zoom lens type
Focal Length: Variable 3X zoom range from 100mm- 300mm
Focus Adjustment:-
Autofocus; with manual focusing mechanism
Manual Focusing:- possible via AF/M switch; Full time Manual focusing during autofocus
is possible

Closest Focusing Distance:- 1.5m (4.9') MACRO
Maximum Magnification:- Max. 0.20X @300mm setting
AF Drive (motor) System:- USM (ultrasonic Motor)
; Full Time MF/AF enabled
Distance Scales: Provided via window on metres/feet.
Functions; AF, AE operation, Auto Aperture, Full Aperture metering; full time M Focusing
Zoom Adjustment:- DUAL rings controlled zoom action with indicator zoom range 100mm, 135mm, 200mm & 300mm

Optical Construction for EF 100-300mm f/4.5~5.6 USM MTF graph for Canon EF 100-300mm f/4.5~5.6 USM
Infrared Marks: 100 (marked), 135mm, 200mm, 300mm (marked).
Depth of Field Scale: None
Angle of View:- 20°'~6° 50'; 14°'~4° 35'°; 24°'~8°15' (H:V:D)
Aperture range:- f/4.5- f/32

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Depth of Field Chart for Canon EF 100-300mm f/4.5~5.6 USM Zoom
Lens construction:- 13 Elements in 10 Groups (5-GROUPS ZOOM SYSTEM)
Minimum Aperture: - f/22/f/32-f/38*(40)
* 1/2 stop; in the case of 1/3 stop, values are shown in parentheses.
Filter rotation: NO
Filter Attachment Size:- 58mm front mounting
Diaphragm: 8 blades
Extenders: usable but
Not advisable
Others: - Extension Tube EF12 (II) 0.226X ~ 0.04X; EF25 (II) 0.37X ~ 0.04X;
Diameter:- 121.5mm x 73mm (4-3/4" x 2-7/8")
:- 540g (1.2 Ibs)

- lens hood:-
ET-65 (II) III; Lens Cap: E58U; hard case: LH-C16 (older); LH-1019; Soft case ES-C17 (older); 58mm close-ups Lens 500D; Lens Dust Cap E Rear Cap, Gelatin Filter Holder Adapter usage (III), (IV): 3 / 4

current model (05.2006).

Relative: Manual Focus Canon FD mount Series Lenses Suggestive External Web Resources: Prices scan via i) Ebay ii) Let's Go Digital iii) Epinion

Canon EF 100-300mm f/4.5~5.6 USM Rear section mount Canon EF 100-300mm f/4.5~5.6 USM front section view Canon EF 100-300mm f/4.5~5.6 USM lens element front
Credit: Images courtesy of Mr. Gene Walls® you can contact Gene via:<ProfAudio@EBAY> Image(s) copyright © 2006. All rights reserved. Please respect the visual property of the contributing photographer.

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