Several different models of Canon FD 135 mm lenses were produced by Canon Inc.

Canon Inc.

is a Japanese multinational corporation that specialises in the manufacture of imaging and optical products, including cameras, camcorders, photocopiers, steppers and computer printers. Its headquarters are located in Ōta, Tokyo, Japan.-Origins:...

 for the Canon FD

Canon FD

The Canon FD lens mount is a physical standard for connecting a photographic lens to a single-lens reflex camera body. The standard was developed by Canon of Japan and was introduced in March 1971 with the Canon F-1 camera. It was the primary Canon SLR lens mounting system until 1987 when the...

 lens mount

Lens mount

A lens mount is an interface — mechanical and often also electrical — between a photographic camera body and a lens. It is confined to cameras where the body allows interchangeable lenses, most usually the single lens reflex type or any movie camera of 16 mm or higher gauge...

. Two were produced in the original "Old FD" style with a silver locking ring for the breech lock mount at the base, while three models were produced as "New FD" lenses where the entire lens barrel rotated to lock the lens in place.

"Old" FD lenses

• 135 mm 2.5: introduced in 1971 as one of the first lenses in the new Canon FD
  Canon FD
  The Canon FD lens mount is a physical standard for connecting a photographic lens to a single-lens reflex camera body. The standard was developed by Canon of Japan and was introduced in March 1971 with the Canon F-1 camera. It was the primary Canon SLR lens mounting system until 1987 when the...
  
   mount. Like all of the very early Canon FD lenses, it does not indicate the type of coating on the front lens ring. All lenses from 1971 (indeed, from the very early 1950s forward) were coated in one form or another.
• 135 mm 2.5 S.C.: The marking for Spectra Coating (SC) was added in 1973.
• 135 mm 3.5:
• 135 mm 3.5 S.C. (I):
• 135 mm 3.5 S.C. (II):

New FD lenses

• 135 mm 2.0
• 135 mm 2.8
• 135 mm 3.5

Specifications

	FD					New FD
Attribute	2.5	2.5 S.C.	3.5	3.5 S.C. (I)	3.5 S.C. (II)	2	2.8	3.5
Coating	S.C.(unmarked)	S.C.	S.C.(unmarked)	S.C.	S.C.	S.S.C.	S.S.C.	S.S.C.
Maximum aperture Aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane. The aperture determines how collimated the admitted rays are,...	2.5	2.5	3.5	3.5	3.5	2	2.8	3.5
Minimum aperture Aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane. The aperture determines how collimated the admitted rays are,...	22	22	22	22	22	32	32	32
Weight	670 g	630 g	480 g	465 g	385 g	670 g	395 g	325 g
Length	91 mm	91 mm	83 mm	83 mm	85 mm	90.4 mm	78 mm	85 mm
Maximum diameter	69 mm	69 mm	66 mm	66 mm	66 mm	78 mm	63 mm	63 mm
Filter diameter	58 mm	58 mm	55 mm	55 mm	55 mm	72 mm	52 mm	52 mm
Groups/Elements	5/6	5/6	3/4	3/4	4/4	5/6	5/6	4/4
# of diaphragm Diaphragm (optics) In optics, a diaphragm is a thin opaque structure with an opening at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture... blades	8	8	8	8	6	8	8	6
Closest focusing distance	1.5 m	1.5 m	1.5 m	1.5 m	1.5 m	1.3 m	1.3 m	1.3 m
Release date	March 1971	March 1973	July 1970	March 1973	November 1976	May 1980	June 1979	June 1979