This is the third version of this lens. It can be identified by the serial number which begins *83 (nominally 583xxxxx - 1985, 683xxxxx - 1986)
It has a 'ZOOMLOCK' feature that allows the focal length to be set at a fixed position.
Maximum Reproduction Ratio; 1:4 at 200mm
Maximum Barrel Diameter; 67.5mm
It differs from the similar lens without 'ZOOMLOCK' in that the front element does not rotate whilst focusing.
The first *64 version has a similar optical layout but has a different front end, longer zoom grip and is slightly longer and heavier.
The second *69 versions are similar in external appearence with a similar optical layout but are of different internal mechanical construction.
Posted by: boggy Date of publication: 22.07.2013