FD Resources - High Zoom Ratio lenses
New FD 150-600mm f/5.6
This is the largest and furthest reach FD zoom lens. It has a maximum focal length of 600mm, a zoom ratio of 4 and is the first SLR zoom lens employing an internal focusing mechanism.
Because focusing moves an element in the middle of the focusing component only 33.8mm, the lens is very well balanced.
The use of UD glass with low dispersion and low index of refraction has made possible a maximum aperture of f/5.6. Zooming and focusing are performed with a single knob. The lens has an unusual design and making it one of the most unique type in its class. This lens posseses all the exterior appearance of a lens within the 'L' family, but it was not highlighted in any of the official catalogue, strange... or may be mine are older catalogues ...???
NOTE:- Info on the NEWER autofocus version
Generally, the focusing mechanism in the complicated optical systems of zoom lenses is operated by rotating the front lens group. This focusing mechanism is simple and works well with ordinary zoom lenses. However, if it were employed in lenses with very long focal lengths and large maximum apertures, the size and weight of the focusing lens element would cause the helicoid to turn with difficulty, restricting the minimum focusing distance and preventing smooth operation.
This is where the internal focusing mechanism comes in. With this new mechanism, focusing is performed by moving the middle group of the focusing element over a mere 33.8mm range. This ensures smooth operation of the focusing ring and reduces the minimum focusing distance to 3 metres. Furthermore, the total length of the lens is not influenced by focusing, which gives the lens better balance. In short, this is the ideal focusing system for long focal lengths such as this.
The New FD 150-600mm f/5.6L zoom lens combine bright image reproduction capabiliy, which is exceptional for a lens of its size, with compactness and portability. It is important, however, to hold the lens absolutely steady while shooting to guarantee good image quality. As the lens is usually used for sports photography where active pursuit of a subject is common, the use of a tripod is required as well as a motor drive or power winder and cable release is highly recommended.
Focal length: 150-600mm
Aperture ratio: 1:5.6
Lens Construction: 15 groups with 19 elements
(including 8 UD glass elements)
Coating: S.S.C. (super spectra coating)
Angles of view: Diagonal: 16°20' - 4°10' Vertical: 9°10'ñ2° 20'
Horizontal: 18°40' - 3° 30'
Distance scale: (m) 3 (Magnification 0.07 x at 150mm. 0.26x at 600mm) to 100.OO (ft);
Focusing mechanism: Rotation of knob
Zooming: Sliding of knob, mechanical compensation system
Minimum aperture: f/32. A
Filter type: Rear section biterholder, drop in type (with 34 mm exclusive filter Regular 1X)
Hood: Built-in type
Cap: Exclusive (CF2-0716)
Function: Auto Aperture, Full aperture metering (AE operation when used with ALL Canon automatic SLR cameras.
Length x max. diameter: 468mm x 128mm
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