Old 08-30-2015   #41
goamules
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Quote:
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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. ...

a Cook Triplet (a true triplet - also called an anastigmat). ...
Lens enthusiasts usually describe designs based on their air-separated groups. So a lens with three distinct groups, or three individual single elements, are called "triplets". Just as any lens with only one group (or element) is called a Meniscus, though technically that would be a single piece of glass.

You are also misleading the role of Cook when you say, "a true triplet also called an anastigmat".

That term, and the first anastigmat lenses were by Paul Rudolph at Zeiss, the first lenses that used the new Jena glass, in the late 1880s. They were the first lenses that had no astigmatism, so they came up with that name. Later, ANY lens that was corrected for astigmatism started to be called "Anastigmat", with many companies infringing on Zeiss' term. So Zeiss came up with a new name for their lenses, Protars.
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Old 08-30-2015   #42
Erik van Straten
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Thank you Garrett and David for this interesting information.

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

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Old 08-30-2015   #43
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I'll grant you we are discussing lens history here, and thus are blurring optical history and optics - not quite the same subject - at least as far as terminology is concerned and I'll leave it at that!

In any event, back to the Hecktor itself. It does (regrettably) seem that the going price of a 5 cm model with clean glass is at least $800 now. I've always been intrigued as well by the Hektor 2.8 cm - such a tiny wide, although based on my experience with the uncoated Zeiss Tessar 2.8 cm (F8) for Contax I'd opt for a coated Hektor 2.8 cm. I'm really impressed at how small and light these early Leica lenses are - even ones that are rather demanding optically to manufacture.


Quote:
Originally Posted by goamules View Post
Lens enthusiasts usually describe designs based on their air-separated groups. So a lens with three distinct groups, or three individual single elements, are called "triplets". Just as any lens with only one group (or element) is called a Meniscus, though technically that would be a single piece of glass.

You are also misleading the role of Cook when you say, "a true triplet also called an anastigmat".

That term was coined by Paul Rudolph at Zeiss for their famous first lenses that used the Jena glass, in the 1890s. They were the first lenses that had no astigmatism, so they came up with that name. Later, ANY lens that was corrected for astigmatism started to be called "Anastigmat", with many companies infringing on Zeiss' term. So Zeiss came up with a new name for their lenses, Protars.
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Old 08-31-2015   #44
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The Leica Way by Andrew Matheson, an old book that has been reprinted several times has depth of field scales for most of our favourite focal lengths.

But surely, the depth of field for a given focal length, at a given distance and at a given aperture is the same whatever the lens?

See this and there must be loads of others:

http://www.cambridgeincolour.com/tut...calculator.htm
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Old 08-31-2015   #45
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Managed to source a 22mm screw-in filter for the Hektor. But it's a hefty Y3 filter, though.
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Old 08-31-2015   #46
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hektor

Such a beautiful glow. It seems to just hang in the air in most of these shots regardless of subject matter…. a veritable time machine of imagery…. Change the car model , hair style, clothing design and your in the '30's. Priceless.
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Old 08-31-2015   #47
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Thank you, Imagedowser!

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

Erik.

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Old 08-31-2015   #48
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I was just finishing off a roll of Ektar 100 with my Hektor last night. We'll see how it looks in color. Hektor-Ektar, has a good sound to it.
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Old 08-31-2015   #49
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22mm filter, the same on summaron 35/3.5 ltm?
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Old 08-31-2015   #50
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Leica II, Hektor 50mm f/2.5, Tmax400.

Erik.

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Old 08-31-2015   #51
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As with any lens, it is more about where you point it and how you print it.
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Old 04-27-2016   #52
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Wide open, then stopped down twice.



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Old 04-27-2016   #53
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Leica II, Hektor 50mm f/2.5, Tmax400.

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Old 05-02-2016   #54
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"Achtung Panzer!"
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Old 05-02-2016   #55
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Rick, nice shot. Is this somewere in Germany?

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Old 05-02-2016   #56
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Houffalize in Belgium actually. This Panther tank was pulled out the river some time after the war.

Path up to the castle in La Roche
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Old 05-03-2016   #57
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Strange to turn a tank of the enemy into a monument. In Germany I've never seen tanks as monuments: they were the losers. In Russia however I've seen T34 tanks as monuments. Saves sculptors.

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Old 05-03-2016   #58
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There are a few more Panthers out there, one in Breda (donated to the city by the Polish 1st Armored Division) for example. And I know of one other in the Belgian Ardennes. In La Gleize, a King Tiger sits in front of the museum there.


Hektor 5cm f/2.5, close to wide-open, Fomapan 100
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Old 05-03-2016   #59
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Quote:
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Thank you, David and mdarnton. A good scanner - and adaptation of the histogram - is important too.

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

Erik.


I just discover this wonderful thread.
Erik, many wonderful photos you posted here.
Could you elaborate a little bit more on the technique of "adaptation of the histogram?
Thanks.
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Old 05-03-2016   #60
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Thank you, Trung. The software of the Epson scanners has a densitometer. You can mesure every single part of the negative. First, go to the Epson software and set the histogram-curve to 0 - 255. Then, find with the densitometer the lightest spot of the negative and adapt it to a value slightly lower than 255 with the white triangle. Then, find with the densitometer the darkest spot of the negative and set that with the black triangle one step above 0. Then use the grey triangle to set the darkest spot to 1. You should now have the right adaptation of the histogram. Set your monitor to maximum brightness to do this.

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Old 05-03-2016   #61
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Thank you Erik,

I will have to figure around a bit as I use Nikon Scan for Coolscan 5000. I hope it has same feature as the Epson's.


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Old 05-04-2016   #62
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I will have to figure around a bit as I use Nikon Scan for Coolscan 5000. I hope it has same feature as the Epson's.

The densitometer is a godsend. I use an Epson V600.

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Old 05-04-2016   #63
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The Two-year-old Terror that is my Nephew
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Old 05-04-2016   #64
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Hektor on Sony A7, Nephew

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Old 05-04-2016   #65
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Leica II, Hektor 50mm f/2.5, Tmax400.

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Old 05-04-2016   #66
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Slightly off topic, but also the Hektor 73mm deserves a place under the sun.

Leica II, Hektor 73 mm f/1.9, Tmax400.

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Old 05-04-2016   #67
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That's a marvellous photograph, Erik. Great range of light and lovely interplay between the two kids. Also, a very interesting child's trike.
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Old 05-04-2016   #68
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Thank you, Peter!

Erik.
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Old 05-05-2016   #69
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I found I like the slightly soft look of the Hektor 5cm with extension tubes for macro shots.



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Old 05-05-2016   #70
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What is the current market price of a clean Hektor, and is it even possible to find a clean one after all these years? I can never get enough 50mm lenses with character.
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Old 05-05-2016   #71
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What is the current market price of a clean Hektor, and is it even possible to find a clean one after all these years? I can never get enough 50mm lenses with character.


After going through this thread, I was curious enough to check ebay for this lens and I was shocked with asking price is in range 700-$1,000
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Old 05-05-2016   #72
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I am not surprised. Such RFF threads have results. Potential buyers/sellers see possibilities that were unknown to them before they saw such a thread.
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Old 05-05-2016   #73
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They were never that common

http://www.reddotcameras.co.uk/screw...-f25-l-39.html

You still sometimes see them on a camera for less than this for both.

(which is a truly awful piece of English!)
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Old 05-05-2016   #74
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They've always been expensive and collectible. It was Leica's first fast lens, and not made for long.
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Old 05-05-2016   #75
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Hektor 5Cm/2.5

wide-open...
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Old 05-05-2016   #76
Erik van Straten
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Leica II, Hektor 50mm f/2.5, Tmax400.

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Old 05-05-2016   #77
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It is a good available light lens too.

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

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Old 05-06-2016   #78
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Rick, I thought it was great shot too but felt that the 82nd Airborne looked too well fed. Then I remembered where they came from...look at bunch of British servicemen from the mid forties and by comparison they appear to have been starved!

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Old 05-08-2016   #79
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Oh, I agree, especially when you think about the most common sizes of original uniform pieces; Like size 36 Jackets. But yes, the US Army was the best fed army at the time.
On the other hand it's a good thing that there's not much weight and age discrimination in the re-enactment world.

I shot some film with my user IIIc and the Hektor over the weekend at the Hembrug (former) weapons & munitions plant. I hope to get round to developing them somewhere later this week.


If small tangents are allowed; I'm still trying to get the hang of the 2,8cm f/6.3 Hektor lens.
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Old 05-08-2016   #80
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Too many modern bits in the background though
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