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  #1  
Old 25th June 2020, 07:06 AM
High Sierra High Sierra is offline
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Default Omicron-EL 105mm f5.6

Can anyone tell me something about this lens - performance, who built it, etc. Anything really. I can't find anything online. I believe it was made for Omega but that is all the information I have apart from it being a metal bodied lens with a very nice click to its aperture ring.
Pete
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Old 25th June 2020, 08:19 AM
Nat Polton Nat Polton is offline
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From Photo Cornucopia.
The Big List of Enlarging Lenses by John Jovic.

OMEGA OMICRON EL105, F5.6 / 105MM
APERTURE RANGE 5.6 - 45
LENS CONSTRUCTION 6-4
OPTIMUN MAGNIFICATION AND MAGNIFICATION RANGE 2-10
ILLUMINATED APERTURE NO
NUMBER OF APERTURE BLADES 8
MOUNTING THREAD 39X1/26
FILTER SCREW THREAD 40.5 X 0.5
APPROXIMATE DATE 1975

All five lenses listed under Omicron have the same size thread.
If you know, could you let me know what the 1/26 is in the thread specification.

All credit to the above named author.

Cheers.
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Old 25th June 2020, 08:43 AM
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Quote:
Originally Posted by Nat Polton View Post
If you know, could you let me know what the 1/26 is in the thread specification.
I believe that would refer to the thread pitch. So there are 26 “peaks” of thread per inch. A number of sources quote the Leica enlarger standard thread as 39mm 26TPI.

Bill

Last edited by Bill; 25th June 2020 at 08:46 AM.
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Old 25th June 2020, 09:35 AM
High Sierra High Sierra is offline
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Quote:
Originally Posted by Nat Polton View Post
From Photo Cornucopia.
The Big List of Enlarging Lenses by John Jovic.

OMEGA OMICRON EL105, .........
.......specification.

All credit to the above named author.

Cheers.
Thanks Nat.
Does anyone know how this lens performs? (although it's a bit late as I've bought it )
Pete
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Old 25th June 2020, 01:07 PM
Nat Polton Nat Polton is offline
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Quote:
Originally Posted by Bill View Post
I believe that would refer to the thread pitch. So there are 26 “peaks” of thread per inch. A number of sources quote the Leica enlarger standard thread as 39mm 26TPI.

Bill
Thank you Bill.
Just looked at my Durst M605 manual and that confirms what you have said about threads per inch.
26 TPI is about one thousands of an inch short of 1mm.
What balm pot of a designer decided to mix up imperial and metric dimensions? Crazy.
Cheers.
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Old 25th June 2020, 02:56 PM
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Possibly Oskar Barnack?

Bill
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Old 27th June 2020, 12:18 AM
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Quote:
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Possibly Oskar Barnack?

Bill
Or Lockheed Martin...

(Sorry - really obscure reference )
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Old 27th June 2020, 06:46 AM
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Or Lockheed Martin...

(Sorry - really obscure reference )
Martin Baker? (Continuing the aircraft maker theme.)

Found this on Wikipedia "True Leica Thread-Mount (LTM) is 39 mm in diameter and has a thread of 26 turns-per-inch or threads-per-inch (tpi) (approximately 0.977 mm pitch) of Whitworth thread form......... The mount was developed by Oskar Barnack at Leica to provide a system that would allow for the exchange of lenses on their new small film cameras (Leica Type 1 and Leica Type 2),........".

Last edited by Bill; 27th June 2020 at 07:08 AM.
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