[rollei_list] Re: Planar vs. Planar
- From: Laurence Cuffe <cuffe@xxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 03 Mar 2010 23:06:29 +0000
Thanks Richard, thats pretty much what I thought.
One other comment on the planar lens design:
My understanding is that the original Planar got a poor press because
of internal reflections, which finally came under control when
elements could be given anti reflective coatings. I think Kingslake
is my source for this.
All the best
Laurence Cuffe
On 3 Mar 2010, at 20:06, Richard Knoppow wrote:
----- Original Message ----- From: "Laurence Cuffe" <cuffe@xxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Wednesday, March 03, 2010 8:40 AM
Subject: [rollei_list] Re: Planar vs. Planar
I'm looking at a lens described as follows
This is old! Engraving on barrel states: No. 6989 Ross, London and
then Planar 1:4 f205mm 8 inch with Zeiss Patent underneath. Must be
c.1880
on the english version of Ebay. I would, from the history, assume
that the seller has got his dates wrong, however does any one know if
Zeiss marketed a different lens with the sam name earlier?
All the best
Laurence Cuffe
On 3 Mar 2010, at 14:14, Richard Knoppow wrote:
The US patent for the Planar 583,336 is dated 1897 and the
British patent is dated a year earlier. I suspect the engraving on
the lens barrel is worn and has been mis-read. Ross had the British
manufacturing concession from Zeiss just as did Bausch & Lomb in
the US and Krauss in France. This was done probably to avoid high
trade tariffs. The original Planar was an f/4.5 lens but may have
been made a bit faster.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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