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      This is a fun lens produced in 
      the late 1960s.   Almost 3 feet in length (when assembled), this 
      is really a "long focus" lens consisting 
      of a barrel with focus collar and a 2 element, 1 group doublet in front.  
      This is not a light weight piece of glass.  
      
      
            
      
      While F8 would be
      considered slow by today's standards, the lens holds its own for surfing
      photographs.  In fact, most of the early surf shots were taken with
      lenses of similar optical construction.  I purchased this lens used in 
      the early 70's from a photographer who did assignments for Vivitar.  
      I have never seen or read about another 
      Vivitar 800 mm lens of this type.     
              
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