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C mount Sopolem Lens


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#1 Gary Y

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Posted 02 July 2014 - 11:38 AM

Hello

In brief I have inherited a large amount of cameras and lenses in various formats from my late father.

One lense is a 23 -115mm f/2,6 Rank Taylor Hobson Monital Sopelem C-mount zoom lens,

I would like some info if possible and whether it is of any value,

I have limited knowlwdge of the subject so any info would be much appreciated.

Thanks


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#2 Jean-Louis Seguin

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Posted 02 July 2014 - 06:01 PM

I've heard of this particular lens but it might be a standard 20-100mm lens modified with a weak 1.15x teleconverter.

Jean-Louis
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#3 Charlie Peich

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Posted 03 July 2014 - 09:19 AM

Gary and Jean-Louis,

 

Some info on the RTH Monital 23 - 115mm Sopelem lens. This is from a 1970 - 1971 catalogue :

 

IMG_20140703_0001_zps4e2bd73b.jpg

 

 

 

IMG_20140703_0002_zps01fb2871.jpg

 

IMG_20140703_0003_zps26012ff6.jpg

 

IMG_20140703_0004_zpsfe3e10ee.jpg

The M series Zoom lenses for 16mm film consisted of the following (from a 1972 S.O.S. catalogue):

 

IMG_20140703_0007_zps3a67b064.jpg

 

 

I attached the spec sheet for the Monital 5 to 1 Pocket Zoom, 17 - 85mm f 3.8 M series lens.

 

The 5 to 1 referenced in the above description for the 23 - 115mm is the most likely the 2.0 version of the 18 - 85mm.

 

 

 

 

IMG_20140703_0005_zps5c84ed76.jpg

 

IMG_20140703_0006_zps394fba05.jpg

 

 

 

Gary, do a search in this forum for 'Sopelem', there is some discussion of the quality of Monital zooms.

 

 

Charlie


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#4 Freya Black

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Posted 03 July 2014 - 10:27 AM

Models with the side finder are kinda cool but generally these lenses are considered to be inferior to actual Taylor Hobson lenses made by Taylor Hobson in the UK.

 

Might be worth something to someone, same for the cameras and other lenses.

 

Freya


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#5 Dom Jaeger

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Posted 03 July 2014 - 09:15 PM

You must have a nice stash of old cine literature Charlie! Thanks for putting that up.

 

Sopelem were a French company created in the 60s by the merger of Som Berthiot and another optical company called OPL. Rank Taylor Hobson were only the international distributers. According to Charlie's literature, the 23-115 was "a lower price zoom offered for less exacting applications than the M series". It was designed for CCTV Vidicon tube cameras of the day which had far less resolution than 16mm film, so it could be manufactured to lower specifications than the lenses made for film cameras.

 

The one advantage for today's market is that it would have been designed to have an image circle diameter of at least 16mm, for use with 1" Vidicon tubes, which was larger than the image circle required for 16mm cameras. So these days you could advertise it as "covering Super 16", which is what people need in order to use an old lens with some of the new Super 16 size sensor cameras that are available. Like Jean-Louis surmised, it was probably based on a 20-100 design, with a 1.15x extender added to increase the image circle.


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#6 Jean-Louis Seguin

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Posted 04 July 2014 - 06:30 AM

Wow! Great stuff! Thanks Charlie.

Jean-Louis
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