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[Rollei] The Truth About the Sixth Element ...



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RUGers

I thought the forwarded reply on "The Sixth Element" may
be germane to a previous question on Planars.

Jerry

http://www.photo.net/bboard/q-and-a-fetch-msg.tcl?msg_id=001CcP&topic_id=35&topic=Medium%20Format%20Digest

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<a href="/pvt/home.tcl">My Workspace</a> : <a href="/community/index.tcl">Community</a> : <a href="/community/forums.tcl">Forums</a> : <a href="q-and-a.tcl?topic=Medium Format Digest">Medium Format Digest</a> : One Thread

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<p>
<h3>The Truth About the Sixth Element ...</h3>
<p>

<blockquote>
Dear Rollei Luminaries,

<p>

I have been for some time unable to reach conclusion on the matter of 
the captioned subject, am now turning to this pool of Rollei resource 
for help.

<p>

The execution of the Planar design since its inception by Paul 
Rudolph in 1890&#39;s has had 3 very rough incarnations (in my naive 
eyes). This was a brilliant symmetrical design with flatness of field 
being one of its great achieved design objectives. It began as a six 
element design, and became 5 element for decades in the Rollei TLR 
configuration. This was seen in 6 elements in the later series. A 7 
element Planar is seen commonly in SLR designs and it is thought that 
the extra elements goes towards a slight retrofocus bias so that the 
obligatory SLR mirror clearance maybe achieved (Is this why there is 
a perception in some quarters that an &#34;equivalent&#34; comparison of 
modern executions between the 2.8GX and the 600X 80/F2.8 Planars 
yield to the &#34;purer&#34; more symmetrical TLR implementation?)

<p>

I have read several previous sources from Arthur Evans, Ian Parker 
(both not particularly noted for accuracy beyond doubt) and sites on 
the web. Here is what I have gleaned:

<p>

- - In 1965, Rollei introduced a 6th element to the Rolleiflex 3.5F 
series in both the Planar and Xenotar executions of the lens and NOT 
the 2.8F series.

<p>

The various explanations that I have read include:

<p>

- - that it is not really a 6th element, but a colour 
correction &#34;filter&#34;. This explanation comes from the thinking that 
circa 1965, colour films were becoming more popular and the Rollei 
engineers wanted to correct for a perceived colour cast in the 
results of the 3.5F. It further goes to state that multi-coating was 
just becoming available, but was seen to be too costly vs. an 
addition of a simple filter element.

<p>

- - The second explanation that I have come across is that the 3.5F was 
not as sharp out to the edges as the 2.8F and this 6th element was 
placed to correct for this problem.

<p>

I have further read that the last few batches of 2.8 and 3.5Fs were 
multicoated just before discontinuation of the series.

<p>

To this my questions are:

<p>

1) Are there perceptible differences between the 5 and 6 element 3.5F 
pictures in terms of edge definition, or colour cast? And is there a 
perceived deficiency of the early 3.5F vs. the 2.8F lens executions 
enough to warrant a new/amended design (with its attendant added 
cost) so late in the life of the 3.5F series? This is perhaps the 
first and most important question.

<p>

2) Why would the 3.5F have a colour cast (if indeed it does), where 
the 2.8F does not?

<p>

3) What is the truth in the REAL reason for the 6th element?? Was it 
a combination of what I have stated or something else?

<p>

4) Is there truth in the multi-coating of the last batches??

<p>

I would be grateful for your expert opinions.

<p>

Thanks one and all. Look forward to what you have to say.

<p>

TC
<br>
<br>
- -- <a href="/shared/community-member.tcl?user_id=48227">TC Khoo</a>, January   06, 2001; 09:24 P.M. Eastern



</blockquote>


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