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De Oude Delft Deltamar 70mm f1.6
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PostPosted: Fri Nov 22, 2024 3:03 pm    Post subject: De Oude Delft Deltamar 70mm f1.6 Reply with quote
This is an aerial reconnaissance lens made for NATO in the late1960s. It is, according to Steve Cushing, a double gauss design. These are not common, but there is a seller on eBay with NIB lenses at a very reasonable price. I am not buying many lenses anymore, but this one I could not resist. My first tests indicate that it does have a very unique bokeh, and a look that I am quite fond of. See what you think.
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PostPosted: Fri Nov 22, 2024 4:36 pm    Post subject: Reply with quote
Very nice, congratulations!


PostPosted: Fri Nov 22, 2024 6:01 pm    Post subject: Reply with quote
Wonderful - thanks for showing! The background looks like liquid. Have seen similar rendering, but that‘s quite pronounced. Like it a lot.


PostPosted: Fri Nov 22, 2024 9:16 pm    Post subject: Reply with quote
So peculiar. Nice!


PostPosted: Sat Nov 23, 2024 12:36 am    Post subject: Reply with quote
Interesting lens. I'm much more familiar with Oude/Old Delft from their Alpa mount stuff, which is usually pretty interesting optically but typically relies on the annoyingly bad Alpa modular helicals.

This is a fixed-focus medium/large format lens that would be mounted in an aerial camera cone, correct? The bokeh presumably wouldn't have really been a concern, since those lenses are designed for near infinity focus use only, so the interesting look would be somewhat of a happy accident.


PostPosted: Tue Nov 26, 2024 11:09 am    Post subject: Reply with quote
BrianSVP wrote:
Interesting lens. I'm much more familiar with Oude/Old Delft from their Alpa mount stuff, which is usually pretty interesting optically but typically relies on the annoyingly bad Alpa modular helicals.

This is a fixed-focus medium/large format lens that would be mounted in an aerial camera cone, correct? The bokeh presumably wouldn't have really been a concern, since those lenses are designed for near infinity focus use only, so the interesting look would be somewhat of a happy accident.


Yes, correct.


PostPosted: Tue Nov 26, 2024 1:18 pm    Post subject: Reply with quote
kymarto wrote:


Yes, correct.


How have you adapted the lens? Via some kind of clamp-adapter or does it have a thread?

Old Delft is really a fascinating manufacturer, perhaps somewhat similar to Wild Heerbrugg from Switzerland. Not too many lenses produced but the ones they made highly regarded and very, very specialized and unique.

I‘ve recently tried to assemble a list of lesser known manufacturers from Europe and Old Delft has been one among three from the Netherlands. I wonder if there have been more though…

Perhaps I‘ll post the list here as well if someone is interested.


PostPosted: Tue Nov 26, 2024 5:37 pm    Post subject: Reply with quote
simple.joy wrote:
kymarto wrote:


Yes, correct.


How have you adapted the lens? Via some kind of clamp-adapter or does it have a thread?

Old Delft is really a fascinating manufacturer, perhaps somewhat similar to Wild Heerbrugg from Switzerland. Not too many lenses produced but the ones they made highly regarded and very, very specialized and unique.

I‘ve recently tried to assemble a list of lesser known manufacturers from Europe and Old Delft has been one among three from the Netherlands. I wonder if there have been more though…

Perhaps I‘ll post the list here as well if someone is interested.


At the moment it has a bunch of plastic sheeting wrapped around the rear barrel and it is force fit into a M65 helicoid. I've ordered a M58 helicoid and it will be easier to simply use a few wraps of PVC tape to hold it firmly down inside that


PostPosted: Thu Nov 28, 2024 8:44 am    Post subject: Reply with quote
kymarto wrote:


At the moment it has a bunch of plastic sheeting wrapped around the rear barrel and it is force fit into a M65 helicoid. I've ordered a M58 helicoid and it will be easier to simply use a few wraps of PVC tape to hold it firmly down inside that


Thanks! I know the "plastic sheeting adapter" all too well... Wink While I have hundreds of adapters, step-rings etc. there still are many lenses which require an improvised solution.


PostPosted: Fri Nov 29, 2024 7:02 pm    Post subject: Reply with quote
BrianSVP wrote:
Interesting lens.
...
This is a fixed-focus medium/large format lens that would be mounted in an aerial camera cone, correct? The bokeh presumably wouldn't have really been a concern, since those lenses are designed for near infinity focus use only, so the interesting look would be somewhat of a happy accident.


Aerial reconnaissance lens for the F-104 Starfighter (low level / high speed flight).
It was a system of three cameras / lenses mounted for right / center / left viewing.

Special rotating shutter with speeds up to 1/9000s developed in the late 1950s; see patent below.
The lens shown there may or may not be the said 1.7/70mm ...



S


PostPosted: Fri Nov 29, 2024 7:08 pm    Post subject: Reply with quote
Something for the hardcore collectors out there - the Delft lenses available for the said 70mm aerial camera were:

* 38mm 1:2.8
* 52mm 1:2.7
* 64mm 1:1.8
* 70mm 1:1.6
* 75mm 1:1.7
* 100mm 1:1.1
* 150mm 1:2.8
* 300mm 1:2.8

Should be interesting stuff for any medium format digital sensor ...

S

EDIT: There are some pretty interesting images out there. This one was taken on Feb 9, 1962, with the Delft 1.7/70mm at 1/5500s and 9 fps. Airplane flying 920 km/h at a height of 30 m above ground. Film Kodak Tri-X (70mm).



PostPosted: Sat Nov 30, 2024 7:38 am    Post subject: Reply with quote
stevemark wrote:


Aerial reconnaissance lens for the F-104 Starfighter (low level / high speed flight).
It was a system of three cameras / lenses mounted for right / center / left viewing.

Special rotating shutter with speeds up to 1/9000s developed in the late 1950s; see patent below.
The lens shown there may or may not be the said 1.7/70mm ...



S


Thanks for the additional information. If I remember correctly Zeiss used a really similar three-part setup for their S-Topar 80 mm f/2 lenses, which were also used for the same purpose. Another crazy expensive lens though and really challenging to adapt.

stevemark wrote:
Something for the hardcore collectors out there - the Delft lenses available for the said 70mm aerial camera were:

* 38mm 1:2.8
* 52mm 1:2.7
* 64mm 1:1.8
* 70mm 1:1.6
* 75mm 1:1.7
* 100mm 1:1.1
* 150mm 1:2.8
* 300mm 1:2.8

Should be interesting stuff for any medium format digital sensor ...

S

EDIT: There are some pretty interesting images out there. This one was taken on Feb 9, 1962, with the Delft 1.7/70mm at 1/5500s and 9 fps. Airplane flying 920 km/h at a height of 30 m above ground. Film Kodak Tri-X (70mm).



If someone has the 100 mm f/1.1 lens, it would be awesome to do a comparison with the Wild Falconar 9.8 cm f/1.4 - I have to admit that would be a shootout to my liking! Wink


PostPosted: Sat Nov 30, 2024 11:46 am    Post subject: Reply with quote
stevemark wrote:
Something for the hardcore collectors out there - the Delft lenses available for the said 70mm aerial camera were:

* 38mm 1:2.8
* 52mm 1:2.7
* 64mm 1:1.8
* 70mm 1:1.6
* 75mm 1:1.7
* 100mm 1:1.1
* 150mm 1:2.8
* 300mm 1:2.8

Should be interesting stuff for any medium format digital sensor ...

S

EDIT: There are some pretty interesting images out there. This one was taken on Feb 9, 1962, with the Delft 1.7/70mm at 1/5500s and 9 fps. Airplane flying 920 km/h at a height of 30 m above ground. Film Kodak Tri-X (70mm).


Is it the the 70mm or 75mm? Little mix-up on aperture values...

Yes, the image is interesting- for a whole lot of reasons!
Odd they went to severely pushed Tri-X over the old Recording film for high contrast imagery.
Still, there is a lot of detail in the image.
Just kind of curious as to what we are looking at here- is it a negative scan- or a repro photo from a book or magazine?

I can't remember if Tri-X was rated for 320 yet in '62. I've read some confusing material in the old photo rags that suggests the rating may have been for 200-250.

-D.S.


PostPosted: Sat Nov 30, 2024 2:43 pm    Post subject: Reply with quote
30m? That would have been ground-shakingly low, especially at those speeds. Hoo boy.

stevemark wrote:
Something for the hardcore collectors out there - the Delft lenses available for the said 70mm aerial camera were:

* 38mm 1:2.8
* 52mm 1:2.7
* 64mm 1:1.8
* 70mm 1:1.6
* 75mm 1:1.7
* 100mm 1:1.1
* 150mm 1:2.8
* 300mm 1:2.8

Should be interesting stuff for any medium format digital sensor ...

S

EDIT: There are some pretty interesting images out there. This one was taken on Feb 9, 1962, with the Delft 1.7/70mm at 1/5500s and 9 fps. Airplane flying 920 km/h at a height of 30 m above ground. Film Kodak Tri-X (70mm).



PostPosted: Sat Nov 30, 2024 11:02 pm    Post subject: Reply with quote
There are Images of tanks taken with said camera at 45 feet / 15 m, about 800 km/h and 15 fps .... Probably while testing the rig.
When I was a kid we we're living near a testing site for the (now famous) Gepard anti aircraft "Tank" and it's Radar system. Swiss airforce Hawker Hunters, Mirage III S and Northrop F-5E we're flying comparably low (clearly <100m) over our house. How I know that? Well, standing just at the test site (situated 130m above our house) and watching the incoming airplanes it was obvious that they came in much lower than the test site, probably 50-75m above our house.

Yeah, it was loud - but it was Cold War Back the and we were proud to have a reasonably strong Air force ...
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