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Canon EF 50mm f/2.5 AFD Compact Macro Special Application Lense A versatile macro lens with focusing from infinity down to half life-size (0.5X), and incorporating a floating element optical design that insures uniform sharpness and contrast be extended to closest to normal focusing distances or at infinity setting.
Credit: Images courtesy of Micro Globe, UK ® <Microglobeuk@aol.com> where he also operates a popular Ebay Store as well as a website (URL:www.microglobe.co.uk) aiming to trade new/used photo equipment. Image copyright © 2003. All rights reserved. Please respect the visual property of the contributing photographer.
With its widest aperture at f/2.5 - which actually ranks among the brightest macro lense in the market between 45-65mm range, where the selection of a moderately fast lens speed provides a reasonably bright viewfinder for picture composition (focusing too, if user shoot in manual mode or performing depth of field preview). The lens is also an ideal general-purpose standard lens but doubles with a true macro capability. A great companion for photographing flat artwork or duplicating works because of its outstanding centre-to-corner flat field performance. The lense employs with a 9 elements in 8 group design, has a f/32 minimum aperture for maximum depth of field control and the diagonal angle of view corresponds with standard lense at 46° (horizontal is 40°).
Photo Credit: Image courtesy of my countryman, Chan Siew Khee® , who has his own Portfolio at Pbase. Image copyright © 2006. All rights reserved. Please respect the visual property of the contributing photographer.
A slight inconvenience is, it requires another dedicated optional accessory Canon Life Size Converter, available separately and adds up to the cost and space in your camera bag, but it allows focusing down to full life-size (1:1 or 1X magnification) with another benefit that it actually increases working distance from the front of the lens to the subject (closest focusing distance with lens alone is 0.23m). Canon counters the issues of portability with an extremely compact dimension and lightweight (weighs halve of 100mm counterpart, at 230g only). If you have done with plenty of macro works, slowly you may realize the shortfall of short focal length - the main reason is its close free working distance between front of the lens barrel to the subject when you intend to go maximum magnification which may limit its application at times. With the life-size optical converter, it does improve some space in between but depends on subject matter, it is still far from comfortable shooting adding the fact when the optical converter is mounted, loss loss occurred and the primary 50mm Macro may decrease f-stop by one stop. Last of which is the perspective, longer focal length lenses provides a more natural perspective than shorter lenses. However, this lens is the cheapest among the few variable options and its is a good consideration if your works often dealt with stationary objects or for duplication of documents and so forth. Well, I have seen some excellent photos taken with this lens with insects or moving creatures (even with flash..) so, probably owners of this lens with such kind of works are damn bloody patience photographers, haha ..
The original version of the Canon 50mm f/2.5 Macro was debuted as one of the primary group of standard EF lenses back in 1987 (the others are EF 50mm f/1.4 and EF 50mm f/1.1L) and it does not has an USM configuration where possibly due to its short focusing range it does not required with an ultrasonic motor for its drive. Physically, it is very similar to the current version. Both have two depth of field scales at f16 and f/32 (could have added few more.. as DOF scale is a very easy visual form of confirmation without other aids such as preview). The front filter attachment ring also provides a magnification ratio scale in yellow). As close focus often may require manual focusing and the AF/M button can be frequently interchanged. The manual focusing ring is like any standard EF lenses, also due to the nature of possible manual focusing, it should also be widen slightly for easier hand grip. I guess these are minor but I don't think Canon will be contented as the physical limitation of requiring an add-on Converter to reach 1:1 Life Size can be quite inconvenience to photographers. Well, base on the culture of Canon, a future version of an update is not totally impossible, although one way of another, Canon does provide an EF-S 60mm f/2.8 Macro for true lens integrated 1:1 Life Size reproduction.
Suggestive External pages: http://www.photozone.de/8Reviews/lenses/canon_50_25/index.htm
UNESCO Tile Project at Mercer Street Playground
Credit:- Hubert J Steed who has a Portfolio hosted at PBase.com. Image copyright 2006. All rights reserved. Please respect the visual property of the contributing photographer.
Technical Specification for Canon EF 50mm f/2.5 Compact MACRO and EF Life Size Converter: -
Type: - Autofocus lens type with manual focusing mechanism
Focus Adjustment:- Autofocus (Front group linear extension system with AFD)
Manual Focusing:- possible via AF/M switch and manual focusing ring
Zoom Adjustment:- Nil. Fixed Focal Length Lens
Closest Focusing Distance:- 0.23m (0.8 ft) film plane to subject
Maximum Magnification:- 0.5X (1:2)
Drive System:- AFD
Distance Scales: Provided via window on metres/feet. Angle of View:- 40° 27° 46° (horizontal, vertical and diagonal)
Lens construction:- 9 Elements in 8 Groups
Aperture range:- f/2.5 - f/32
Number of Diaphragm Blades: - 6
Minimum Aperture: - f/32
Filter Attachment Size:- 52 mm
Others: - Macro magnification scales provided.
Diameter:- 67.6 x 63.0mm ( 2.7" x 2.5")
Weight:- 280g/9.9 oz.
System Accessories:- Extension Tube EF12 (II) 0.74X~0.24X; Extension Tube EF25 (II) 1.04X~0.54X; Lens Cap E52; exclusive lens case; Gelatin Filter Holder III NC and IV (uses 48mm drop in filters)
life-size Converter EF
Unless you can live with half magnification with potential of going life size reproduction, Canon does provides a unique accessory, dedicated exclusively to the EF 50mm f/2.5 Compact Macro lens to extend the magnification from 1:2 to 1:1. Unlike a conventional extension tube, the Life Size Converter EF has a four-element optical design that acts like a tele extender, allowing magnifications from 0.26x to 1x (full life-size) while increasing the working distance slightly from the front of the lens to the subject.
The converter is actually an optical device rather than an Extension Tube, so although this dedicated converter is to supplement the EF 50mm f/2.5 Compact Macro where the magnifications can be obtained from 0.26Xto 1X, attaching this Converter decreases the aperture by one stop (f/3.5 for 0.26X). But Canon stated optical quality of the primary lens is not affected as it was designed to be optimized with the primary 50mm Macro. When 50mm macro is used with the Converter, please note that for EOS cameras that equipped with multi-points AF selections such as EOS-1N, the central autofocus area's cross-type sensor is always maintains active, but when the Life Size Converter is attached (or with the Canon EF 100mm Macro USM if the focusing scale is set closer than 1:10), this may not work effectively. So, preferably to use the far left and right focusing points for an off-center subject. There are inevitably some light loss factor when couples the Converter to the 50mm MACRO but TTL metering will automatically compensate the light loss via drop in shutter speed (rather than calculating on lens speed. The compromise is the dimmer viewfinder as well as difficult to view when used with stopped down AE. The converter is not cheap - priced between USD250~270-00 for a good used unit from USD400-00+ for a new unit. That is all many would rather cough out extra for the alternative Canon EF 100mm f/2.8 USM MACRO as it has a constant aperture throughout the entire focusing range (maxiumum 1:1 RR). As a matter of fact, the latter has remained as Canon best seller macro lense even some would think the Canon EF180mm f/3.5L is better in many other variable factors as well as in its optical performance. Naturally, if you own a digital Canon SLR, a good compromise is to take a good look at another Canon EF-S 60mm f/2.8 USM MACRO which tailored for APS-C size sensor Digital SLRs and it goes direct to 1:1 RR without a Converter, which gives an overall good price and performance ratio However. when using this EF-S lens with a 35mm format film based SLR, it multiplies the primary focal length to arpprox. 1.5+X factor. So, dont try out-smart Canon..unless you own both a APS-C digital Canon as well as a film Canon and can live with a little vignetting during focusing on your filmed based Canon SLR.
I seldom do extreme close-up pictures. As I am awaiting for someone to contribute a good macro photo, Just treat this as a dummy picture as I don't think it is good enough to be used here. I don't like to make to seen as creating a privarte showcase of my own pictures in this site and would love to have other's better visual works displayed or replace this..
Private Visual works for another project on www.IMAGES.com.my
Technical Specification for Canon Life Size Converter EF: -
Type: - Autofocus Life Size Converter exclusively made for EF 50mm f/2.5 Compact MACRO
Focus Adjustment:- Autofocus
Manual Focusing:- possible via primary lens's manual focusing ring
Aperture range:- via primary lens
Closest Focusing Distance:- 0.24m (0.8 ft) film plane to subject
Maximum Magnification:- 1X (1:1)
Drive System:- AFD with primary 50mm lens
Distance Scales: nil. Make use of primary lens
Angle of View:- not applicable
Lens construction:- 3 Elements in 4 Groups
Number of Diaphragm Blades: - Nil
Minimum Aperture: - not applicable
Filter Attachment Size:- not applicable
Diameter:- 67.6 x 34.9mm ( 2.7" x 1.4")
Weight:- 160g/5.6 oz.
System Accessories:- Lens cap R F 3 standard cap; lens case/pouch: LP811 or ES-C9; Hard lens case: LHP-C10
Credit:- Richard Nicholls who has a Portfolio on his own. Image copyright 2006. All rights reserved. Please respect the visual property of the contributing photographer.
Canon Macrophotography Optic: EF 50mm f/2.5 Compact MACRO w/ Life Size Converter EF | EF 100mm f/2.8 MACRO | EF 180mm f/3.5L MACRO | MP-E65mm f/28 MACRO | External Link: - Canon EF-S 60mm f/2.8 USM Macro (www.photozone.de) | Relative: - Canon FD Macro Lenses 20mm 35mm 50mm 100mm 200mm or older S.S.C. range of macro lenses + Main Index Page on Canon FD lens Resources
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