[rollei_list] Re: Planar, Xenotar, Summicron

  • From: "Peter K." <peterk727@xxxxxxxxx>
  • To: rollei_list@xxxxxxxxxxxxx
  • Date: Thu, 26 May 2005 13:45:26 -0700

Companies like Tokina made molded plastic elements for some zoom
lenses. Not sure of the compsite of plastic material for a lens
element, but they worked well. Of course they were created via molding
and far less expensive. The only problem with them was to avoid
leaving them in the sum or heat for any long time period and also to
avoide cleaning them alcohol.

Peter K

On 5/26/05, Fox, Robert <RFox@xxxxxxxx> wrote:
> Speaking of Leica, The BJP is reporting today that Leica is in deeper
> trouble than expected as they are delaying yet again the introduction if
> their top of the line digital slr.
>=20
> Why doesn't another photo company go after Leica for purchase?
>=20
> R.J.
>=20
> -----Original Message-----
> From: rollei_list-bounce@xxxxxxxxxxxxx
> [mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf Of Jerry Lehrer
> Sent: Thursday, May 26, 2005 2:19 PM
> To: rollei_list@xxxxxxxxxxxxx
> Subject: [rollei_list] Re: Planar, Xenotar, Summicron
>=20
> Richard,
>=20
> You have NOT written too much.  I read and enjoy
> it all.
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> Now, i understand that some Aspheric surfaces are
> cast and not ground at all!
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> What is your opinion of the much rumored Leica
> lenses which have "non-glass" (read; plastic) internal
> elements.  They are supposed to be fast and light weight.
>=20
> Richard Knoppow wrote:
>=20
> > ----- Original Message -----
> > From: "Ardeshir Mehta" <ardeshir@xxxxxxx>
> > To: <rollei_list@xxxxxxxxxxxxx>
> > Sent: Wednesday, May 25, 2005 8:09 PM
> > Subject: [rollei_list] Re: Planar, Xenotar, Summicron
> >
> > >
> > > On 25-May-05, at 7:24 PM, Richard Knoppow wrote:
> > >
> > >> [...]
> > >>
> > >> In any case, all of these lenses, five element and six
> > >> element
> > >> Planar/Xenotar, and the Leitz Summicron, are all members
> > >> of the
> > >> same family of lenses.
> > >
> > > MOST instructive. Thanks.
> > >
> > > BTW: does anyone (Richard?) know to which family the
> > > (modern) Canon
> > > EF 50 mm f/1.8 lens belongs? (I'm NOT speaking of the 50
> > > mm f/1.4 here.)
> > >
> > > (I'd like to know since I have one of those for my EOS
> > > Elan 7, and it
> > > comes highly recommended, optically speaking, even though
> > > it's quite
> > > inexpensive).
> > >
> > > Cheers.
> >
> >
> >
> >
> >
> >
> > I've written too much.
> >
> > ---
> > Richard Knoppow
> > Los Angeles, CA, USA
> > dickburk@xxxxxxxxxxxxx
> >
> > ---
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--=20
Peter K
=D3=BF=D5=AC
---
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