Canon FD Resources - Extenders
FD Extender 2X-A, FD 2X-B & FD 1.4X-A

 

Extenders are small auxiliary lenses that can quickly convert the focal lengths of your interchangeable lenses by mounting it between a primary lens attached and the camera body via the lens mount.

extenderoldfd.jpg
A 400mm lens will become an 880mm or converting a 880mm to a 1,600mm ! Adding an extender between the lens and the camera body increases the focal length of the lens by either 1.4 times or 2 times, depending on the power of the extender used.

Some useful resources/manual prepared by Christian Rollinger:

Canon FD 1,4X Extender (1982)
Canon FD 2A/2B Extender (1980)
Canon Macrophoto Adaptor Manual (1980)
Canon FD Extension Tube M Manual

One distinctive characteristic of Extenders is they do not change the closest focusing distance of the master lens and this increase the shooting flexibility. They can convert a super telephoto into an ultra-telephoto. Combining the FD 2X-A, FD 2X-B, and FD 1.4X-A extenders with various master lenses, unique applications become possible which enhance the distinctive characteristics of the master lenses.

The diagrams below showing the respective extenders' lens constructions and how these extenders convert focal lengths. The lens constructions are designed to form a concave lens. Most lenses are convex in order to bend the entering light rays towards the center and form an image on the film. When installed between the primary master lens and the camera, the concave extender bends the incoming light rays less sharply and thus extends the point at which the image is formed and thus extends the focal lengths of convex lenses.

extenderchart.jpg
These dedicated extenders also incorporate provisions for correcting aberrations and best is to use as advice. i.e. individual extender to only use it within certain group of lenses.

The FD 2X-A extender doubles the focal length of the prime lens and is designed for use with any lens with a 300mm focal length or longer, including zoom lenses with 300mm within their range. Using the FD 2X-A converts the 880mm lens to 1600mm, while retaining a minimum shooting distance of 14 meters. The FD 2X-B extender doubles the focal length of any lens with a focal length of less than 300mm, including zoom lenses with 200mm within their range. The FD 1.4X increases the focal lengths of all lenses with focal lengths of 300mm or greater by 1.4 times.
FD2XA-B/FD2XBa.jpg
Of course, these Extenders retain most of the AE function even when mounted to any of the Canon AE bodies or shooting in AE modes because signals coming out of the master lens can also be relay to the camera body.

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.

A draw back for using an Extender is, as in the case of both the FD 2X-A and FD 2X-B which doubles the focal length of the prime lens, this ability also cause the loss of 2- f/stops throughout the aperture range. This is because the extender makes the lens longer and more light is lost as the light travels from the front of the lens to the film plane. Naturally but also require to note this: when an extender is attached, the depth of field is also be reduced by half. To lenses with smaller maximum aperture, this might pose some problem in focusing especially when used with focusing screens that has split image rangefinder as the split image may darken and cause focusing difficult. The FD 1.4X-A extender only causes a reduction of the given aperture by one f/stop, so the loss of brightness in the viewfinder is less significant.

But overall, these extenders still present an attractive and cheap alternatives as they can effectively doubles the number of lenses you have. Another key advantage is being, they are made extremely compact and easy to take along with telephoto lenses for shooting athletic games, landscapes, scenery, etc.


extend14xview.jpg
Extender FD 1.4X-A

The FD 1.4X-A is a rear converter designed to step up by 1.4 times the focal lengths of prime lenses with 300mm focal lengths or greater. It shows its maximum optical performance when combined with one of Canon's L-series lenses. While 2 f/stops are sacrificed for the use of the double power extenders, using the FD 1.4X-A makes it possible for you to enjoy telephoto effects at the price of only one f/stop.

This extender combines with multicoated lenses without generating ghost images and flare, and it transmits all AE information to the camera body. Warning: This particular Extender may not be working with older models of FD lenses (or FL-Modified lenses). Please refer to the spec sheet for complete compatibility issues.

14xoptic.jpg
Specifications:

Construction: 3 groups 4 elements
Coating: SSC (super spectra coating)
Magnification: 1.4x

Used with lenses: Telephoto lenses 300mm and longer *
Function: Auto Aperture, Full aperture metering (AE operation when used with ALL Canon automatic SLR cameras.
Length x max. diameter
: 34.6mm x 54mm
Weight: 210g

UPDATE: - From : Greg Volan (gvolan@mac.com)

" .. Thank you for posting the helpful information about Canon FD tele-extenders. As I read the pages, I observed the statement that the FD 1.4X-A extender can be used with ALL FD lenses 300mm or greater. Unfortunately, because it would be a useful combination, the 1.4X-A will not work with the FD 400mm f4.5 lens. The lens has a masking plate at its rear which prevents the protruding lens system of the extender from being mounted. I hope this comment will be helpful to some"... . Regards, Greg

UPDATE 2: Robert Glenn Middleton (the_redd_groyne@hotmail.co.uk)

"... If you read the Canon instruction leaflet for the FD 1.4X extender, you will see that the 400/f4.5 lens is not the only FD lens that this extender will not fit, due to the rear rectangular baffle plate. However, the 400/f4.5 is the only lens that Canon state cannot be modified by removing the said baffle. They offered a modification service for the other lenses, especially the L series. I seem to recall that the baffle on the 800mm L series was easy to remove. For anybody interested, Christian Rollinger's Canon FD site contains the aforesaid instruction leaflet
...".




Extenders FD 2X-A and FD 2X-B These all purpose rear converters double the focal lengths of master lenses while maintaining the master lenses' original minimum focusing distance. The FD 2X-A extender doubles the focal length of any lens with a 300mm focal length or longer, including zoom lenses with 300mm within their range. The FD 2X-B extender doubles the focal length of lenses with a focal length shorter than 300mm including zoom lenses with 200mm within their range.

FD2XA-B/FD2XA6.jpg
All AE information signals derived from a master lens can be transmitted to the camera body. However, Canon recommends that the New FD 300mm f/2.8L to be used with the Extender FD 2X-B instead. The Extender FD 2X-B is supplied as a kit when you purchase the 300mm f/2.8L lens brand new but since it has been discontinued, some dealers may not bundle the Extender with the lens.
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.

Specifications:

Extenders FD
2X-A
Construction: 4 groups 6 elements
Coating: SSC (super spectra coating)

Magnification: 2X
Used with lenses: Telephoto lenses 300mm and longer
Function: Auto Aperture, Full aperture metering (AE operation when used with ALL Canon automatic SLR cameras.
Length x max. diameter: 35.2mm x 64mm
Weight: 210g

FD2XA-B/FD2XA5.jpg FD2XA-B/FD2XA1.jpg FD2XA-B/FD2XA2.jpg  
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.

Specifications: Extenders FD 2X-B
Construction: 5 groups 7 elements
Coating: SSC (super spectra coating)

Magnification: 2X
Used with lenses: Less than 300mm and zooms with 200mm in their range.
Function: Auto Aperture, Full aperture metering (AE operation when used with ALL Canon automatic SLR cameras.
Length x max. diameter: 43mm x 64mm
Weight: 240g

 
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.

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