Hektor 5cm 2.5
Old 07-17-2015   #1
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Hektor 5cm 2.5

I have been looking at offerings of some Hektor lenses. Some lenses have f=5cm and others have F=5cm. Are both genuine Leica or is one Russian made? Haw can you tell them apart? One seller states there is nor serial number on the lens. Did some very early lenses have no SS?

Also, is this lens really worth the $1000 (average) asking price?
Why not just $200?
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Old 07-17-2015   #2
Erik van Straten
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Some Hektors 50mm f/2.5 have a "5cm" and others a "50mm" engraving. The Leica I model A with a Hektor instead of an Elmar has the "50mm" engraving. These Leicas are very rare and very expensive. Later the lens was made in screwmount until it was superseded by the Summar 50mm f/2. These Hektors have the "5cm" engraving.
The Hektors 50mm/5cm are relatively rare: about 10.000 pcs were made in the years 1930 - 1933.

Optically they are very interesting. They have six elements in three groups. Six surfaces are cemented. This makes the lens quite contrasty. It is a triplet, but rather complicated.
After the war some of them were coated, but so far I've never seen one.

Erik.
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Old 07-17-2015   #3
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I have just discovered a RFF thread from 2008 on the same topic, Erik. In it, comparisons were discussed between the Hektor and the Summar.
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Old 07-17-2015   #4
Erik van Straten
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OK Raid.

Leica II, Hektor 50mm f/2.5, Tmax400.

Erik.

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Old 07-17-2015   #5
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Love the recurrent round lines in this Erik, always impressed with the quality and consistence of your work.
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Old 07-17-2015   #6
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I love the B&W rendering and glow, Erik.
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Old 07-17-2015   #7
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Thank you, Giulio and Raid!

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Old 07-18-2015   #8
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If you really want rare, look for the F2 version (see aperture settings engraving) and 11 O'clock infinity lock.

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Old 07-19-2015   #9
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True Hektor 50 2.5 with Leica Standard, traveled with in Thailand:

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Old 07-19-2015   #10
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Quote:
Originally Posted by goamules View Post
If you really want rare, look for the F2 version (see aperture settings engraving) and 11 O'clock infinity lock.

Thanks got the tip.
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Old 07-19-2015   #11
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Quote:
Originally Posted by Erik van Straten View Post
OK Raid.

Leica II, Hektor 50mm f/2.5, Tmax400.

Erik.


Beautifully composed portrait Erik. As mentioned, the circular shapes are very pleasing.
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Old 07-20-2015   #12
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You've already seen some of my results over at Leicaplace, Raid.

Unfortunately my image host is down at the moment. I'll post a few more from that roll later.
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Old 08-22-2015   #13
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Leica II, Hektor 50mm f/2.5, Tmax400.

Erik.

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Old 08-22-2015   #14
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Erik,

Your photographs are always a joy to see, and your comments are very instructive.

Thank you for sharing !

Regards,

Luddite Frank
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Old 08-23-2015   #15
Erik van Straten
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Thank you, Luditte Frank!

If other members have Hektor 50mm shots, please post them here.

Leica II, Hektor 50mm f/2.5, Tmax400.

Erik.

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Old 08-23-2015   #16
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Mine's undergoing reconstructive surgery at the moment.
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Old 08-23-2015   #17
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Quote:
Originally Posted by Mr_Flibble View Post
Mine's undergoing reconstructive surgery at the moment.
I hope it will be all right soon.

Leica II, Hektor 50mm f/2.5, Tmax400.

Erik.

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Old 08-24-2015   #18
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It is in good hands and I should have it back in a few weeks.
The front element will be properly recurved and the formula will be recalibrated. The play in focusing helical will be tightened up as well.
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Old 08-24-2015   #19
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This reminds me of the British photographer James Ravilious. Wonderful work, Erik!!

Quote:
Originally Posted by Erik van Straten View Post
I hope it will be all right soon.

Leica II, Hektor 50mm f/2.5, Tmax400.

Erik.

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Old 08-24-2015   #20
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Quote:
Originally Posted by Mr_Flibble View Post
It is in good hands and I should have it back in a few weeks.
The front element will be properly recurved and the formula will be recalibrated. The play in focusing helical will be tightened up as well.
I'm very curious were you did send it to!

Erik.
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Old 08-24-2015   #21
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Quote:
Originally Posted by maddoc View Post
This reminds me of the British photographer James Ravilious.
Thank you, Gabor, I admire Ravilious!

Erik.
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Old 08-24-2015   #22
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It's with Malcolm Taylor in the UK.
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Old 08-24-2015   #23
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Erik, beautiful tones, everything I love about b/w photography!
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Old 08-24-2015   #24
Erik van Straten
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Thank you, Rayt.

Leica II, Hektor 50mm f/2.5, Tmax400.

Erik.

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Old 08-24-2015   #25
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One from the fomapan 100 test roll, aperture limited to f/4.5 (any smaller would bring out the fuzziness of the scratched up center on the front element)

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Old 08-24-2015   #26
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Erik, these are lovely tones. Did you use any filters on the Hektor, yellow or otherwise? Which one will fit on an Hektor?
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Old 08-24-2015   #27
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Thank you, Raid and Rayt.

Rayt, I never use a filter. I do the scanning myself. I adapt the histogram of the picture with the software of the scanner (Epson).

The filter size of the Hektor I don't know. It is quite a lot bigger than the filter size of the Elmar, but smaller than that of the Summar.

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Old 08-24-2015   #28
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Hello,
Just as the 5cm f3.5 Elmar had a series of 19mm Leitz screw filters produced to fit the lens allowing the aperture to be changed without removing the filter, Leitz also produced 22mm screw filters of the same type to fit the 5cm f2.5 Hektor but these are quite rare.
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Old 08-24-2015   #29
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Thank you, Pan F, I tried to find the filter size in the reference-books, but to no avail.

Rick, your shot looks very promising. I hope the lens comes out really fine.

Leica II, Hektor 50mm f/2.5, Tmax400.

Erik.

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Old 08-24-2015   #30
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The whole process should cause a little focus shift, but nothing radical.
I felt the lens was rare enough to have it restored properly.

On the R-D1 it behaved quite well too when used at a suitably large aperture.
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Old 08-29-2015   #31
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Leica II, Hektor 50mm f/2.5, Tmax400.

Erik.

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Old 08-29-2015   #32
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A great shot Erik!
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Old 08-29-2015   #33
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Erik, the tonality of your work is beautiful. How much of that is the lens, and how much your technique, do you think? Already, you got me to order 100' of TMax-400, a film I rejected a couple of decades ago, and the first roll is almost through.

I hope you say it's technique--I don't need yet another 50mm lens.
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Old 08-29-2015   #34
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OK, never mind. Been to Flickr. Everything Erik does has the same beauty. Maybe the lens helps, but it's not the lens.
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Old 08-29-2015   #35
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Thank you, David and mdarnton. A good scanner - and adaptation of the histogram - is important too.

Erik.
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Old 08-29-2015   #36
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Quote:
Originally Posted by Erik van Straten View Post
Some Hektors 50mm f/2.5 have a "5cm" and others a "50mm" engraving. The Leica I model A with a Hektor instead of an Elmar has the "50mm" engraving. These Leicas are very rare and very expensive. Later the lens was made in screwmount until it was superseded by the Summar 50mm f/2.
The Hektors 50mm are relatively rare: about 10.000 pcs were made in the years 1930 - 1933.

Optically they are very interesting. They have six elements in three groups. Six surfaces are cemented. This makes the lens quite contrasty. It is a triplet, but rather complicated.
After the war some of them were coated, but so far I've never seen one.

Erik.
A lens with six elements cannot be a triplet. Wonderful shots regardless.
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Old 08-30-2015   #37
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Quote:
Originally Posted by David Murphy View Post
A lens with six elements cannot be a triplet.
Why not? The first and second, the third and fourth and the fifth and sixth are glued together.

Look it up. A Hektor is a triplet. 100% sure.

Erik.

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Old 08-30-2015   #38
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Leica II, Hektor 50mm f/2.5, Tmax400.

Erik.

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Old 08-30-2015   #39
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Erik the Hektor diagram, as you have displayed it, has six lens elements in three cemented pairs - or "groups" if you prefer that terminology. It is a triplet composed of doublets so-to-speak. My suspicion is that the doublets are probably each achromats. An achromat is a lens doublet (cemented or air spaced) that acts like a single lens element with very little chromatic aberration.

Small cemented achromats are more economical to manufacture than air spaced achromats, which could have been a theoretically superior design, but very challenging technologically for 1930. My suspicion is that the designer of the Hektor may have been trying to extend the concept of a Cook Triplet (a true triplet - also called an anastigmat). The Cook Triplet was a moderately sophisticated lens design by the standards of the early 20'th century.

Anyway, all the techno babble aside, the Hektor is really a beautiful piece of retro technology which I was hardly aware of it till Raid instigated this thread. Now I want one too!
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Old 08-30-2015   #40
Erik van Straten
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The Hektor was the masterpiece of Max Berek, the chief optical designer at Leitz. He named his creation after his dog.

There were also Hektors of 28mm, 73mm and 135mm. The optical lay-out of the 73mm is very much like the 50mm. It had the very high speed of f/1.9.

Erik.
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