User Tools

Site Tools


photo:vivitar450mmf4.5

Table of Contents

Vivitar Series 1 450mm f/4.5 Asph Solid Cat mirror lens

introduction

  • this super telephoto lens introduced in the mid 1980's is a catadioptric mirror lens, and as with all such mirror lenses, share the following characteristics:
    • manual focus
    • fixed aperture (in this case f/4.5)
    • virtual elimination of chromatic aberration as uses mirror rather than lenses
      • also means focus position for infrared photography is the same as for light photography
    • central mirror:
      • allows much more compact lens length as the optic path is reflected internally twice
      • by necessity, blocks some of the light and thus causes:
        • decrease in image contrast
        • characteristic “doughnut” shaped bokeh imagery in out of focus areas
  • their ruggedness is partially due to their solid, one-piece construction, unlike most production mirror lenses

specs

  • 450mm focal length and field of view (5.6°) at infinity focus
  • fixed f/4.5 aperture
  • 11 lens elements, 7 groups - unusual use of aspherical plastic elements in its design
  • 97mm front filter
  • closest focus 3.65m
  • 35.5mm rear filter thread
  • T2 lens mount thread
  • 117mm diameter, 152mm long and 1.64kg
  • cost ~$US800 in 1986

reviews

photo/vivitar450mmf4.5.txt · Last modified: 2014/05/18 09:12 by gary1