RE: [Rollei] Why the 6-element lens for 3.5Fs

["Kotsinadelis, Peter (Peter)" <peterk >]

Jerry, there go my virgin eyes....no more caffeine for you late in the
day. :-)


> -----Original Message-----
> From: Jerry Lehrer [mailto:jerryleh  ]
> Sent: Thursday, May 01, 2003 7:49 PM
> To: rollei  us
> Subject: Re: [Rollei] Why the 6-element lens for 3.5Fs
> 
> 
> Richard
> 
> I say it again!  In 1952, I saw a H'blad Ektar apart at Oscar
> Heinemann's
> shop.  It was FIVE (5) elements.  OH said that it looked just like a
> Medalist lens.  Maybe the first Ektars were 4 element Tessars, but
> the later ones were not.  There is no need to count F**$^@g 
> reflections
> when the lens is apart and you can see the cemented surfaces.
> 
> I can supply no more than my eyewitness report.
> 
> End of discussion!
> 
> Jerry
> 
> Richard Knoppow wrote:
> 
> > ----- Original Message -----
> > From: "Kotsinadelis, Peter (Peter)" <peterk  >
> > To: <rollei  
> > Sent: Thursday, May 01, 2003 2:39 PM
> > Subject: RE: [Rollei] Why the 6-element lens for 3.5Fs
> >
> > >
> > >
> > > Was the Tessar for the 'blad any good? Better than the
> > Ektar lenses they
> > > were using?
> > >
> > > -----Original Message-----
> > > From: todd [mailto:todd_belcher  ]
> > > Sent: Thursday, May 01, 2003 2:22 PM
> > > To: rollei  us
> > > Subject: Re: [Rollei] Why the 6-element lens for 3.5Fs
> > >
> > >
> > > Richard, I think QG has the 2.8 Tessar in an early
> > Hasselblad mount and
> > > does not mean the 2.8 Tessar as found in the Rollei TLR.
> > >
> > > todd
> > >
> >   That would be interesting. AFAIK, the Hasselblad Ektars
> > were Heliar type lenses of the type designed by Fred Altman
> > and covered under USP 2,279,384. Altman states that he used
> > the extra element to obtain better control of rim rays,
> > which is what is needed when making a fast lens.
> >   Other examples of this lens are all f/3.5 however.
> >   It would be of considerable interest to me to know for
> > certain what the construction is. Someone who has one could
> > count the reflections and tell whether it is a Heliar or
> > something else.
> > ---
> > Richard Knoppow
> > Los Angeles, CA, USA
> > dickburk  
> 
> 

------------------------------