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Meet the Anamorphic Lens Cap (Old Delft Delrama 8 CP 1,5)

Delrama Old Delft Oude Delft 8mm 1.5x

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#1 Julian

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Posted 10 February 2013 - 09:33 PM

Somewhere last year I stumbled upon a lot of Delrama 8 CP 1,5 lenses, made by the Dutch company Old Delft.

 

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A tiny fixed focus 1,5x anamorphic for 8mm camera's. It uses curved prisms and mirrors instead of cylincrical lenses. I bought them with some diy projects in mind...

 

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Sadly, the Delrama's are in pretty bad shape, as you can see. It isn't fungus, it is the silver on the mirrors that is detoiriated. You can't clean it, you'd have to redamp the mirrors to fix it. I never really looked into it, since it seems an expensive process.

So they have been lying around here for a while... Today I decided to experiment a bit more with them. The Delrama's have a screw mount that is exactly the same size as a C-mount lens. I don't have any lenses where I can fit it onto directly, but since it's so small and light, I decided to sacrifice a simple plastic lens cap from one of my Minolta's. I cut a hole into it, just large enough to fit the filter thread. It holds the Delrama pretty well.

 

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On the last picture it is attached to my Minolta 58mm f/1.4. It seems to need a pretty long lens. With the 58mm and the GH2 it works fine, but on my 35mm it's like looking trough a tunnel.

 

I also 'modified' a Computar 25mm f/1.8 C-mount lens. I superglued a C-mount extension ring to the inner part of the lens barrel (that doesn't move while focusing). I loosely screw the Delrama on top of that, align it and then tighten it with the little clamp.

 

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This results in a tiny anamorphic combination, but it only works in EXTC. Also, I think I'll have to modify the Computar lens, since it doesn't quite focus to infinity. It's a funny little combination though.

 

I took the Anamorphic Lens Cap and the Computar Anamorphic out for some test shots:

 

 

In hindsight I should have used a profile with more contrast, this was all shot at smooth -2-2-2-2. The damaged Delrama's probably make the image even flatter. But the light was already pretty flat.

 

I have no idea how it would compare to a Delrama in pristine conditions, but even with the damaged mirrors these liltle ones still look usable in some way. It is nice to be able to rack focus them.

 

I'm not sure what the minimum focus distance is. I read 4 meters somewhere, but I think it's closer to 2 meters. I also tried holding some diopters in front of the lens, with a +1 diopter I could focus at 0,5 meters.



#2 Eric Gaston

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Posted 11 February 2013 - 08:03 AM

Nice i also have the 8mm and the 16 mm. My copies are also with damaged silver. I've got to find someone who can resilver the prisms.



#3 Julian

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Posted 11 February 2013 - 12:25 PM

Let me know when you find someone or a place :) I heard damping mirrors is a 'common' practice for astronomers.



#4 QuickHitRecord

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Posted 11 February 2013 - 12:52 PM

It's nice to see a write up about these. I haven't seen people posting much info about them at all. The ability to rack focus is nice. I'm curious though, since this seems to be an optical effect created by mirrors, how do the flares look?



#5 Julian

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Posted 11 February 2013 - 07:43 PM

Just went out to shoot some bright lights. It looks definitely different because of the mirrors. A lot of reflections going on, interesting effects.

 

 

Good thing is, I used the Konica Hexar 40mm f/1.8 for this clip (at f/1.8) and it works without vignetting!

Shot on Panasonic GH2, unhacked @ iso 3200.

 

Also, the focus seems fine from about 2 meters distance without diopters.



#6 EeeCeeGee

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Posted 12 February 2013 - 08:05 AM

Let me know when you find someone or a place :) I heard damping mirrors is a 'common' practice for astronomers.

I found one in Diemen, close to you I guess since the footage you posted is from Amsterdam  :)

 

here's the url

 

http://www.ferrywink...las-verzilveren



#7 QuickHitRecord

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Posted 12 February 2013 - 12:21 PM

Just went out to shoot some bright lights. It looks definitely different because of the mirrors. A lot of reflections going on, interesting effects.

 

Those ARE unique looking flares. I can't quite put my finger on why they look so different. They don't show up when you'd expect them to (i.e. when you were pointing the camera into headlights) and they look solid. As in, they don't look like light but rather like something physical and tangible emanating from your light sources. Cool!



#8 Julian

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Posted 12 February 2013 - 04:35 PM

The flare seems to show up in the lower and upper parts, because of the mirrors. Actually it also gives a pretty nice effect when you use lenses that are too wide, so you can actually see the mirrors inside the anamorphic.

 

Here's an example, not my video, it's made with a 16mm Delrama and a 20mm f/1.7 Panasonic:

 



#9 Julian

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Posted 04 March 2013 - 11:55 PM

Shot some more with the Anamorphic lens cap. Still experimenting. Tried some focus pulls.

 

 

Panasonic GH2 - Driftwood Moon Trail 5 hack (HBR 25 fps)
Minolta 58mm f/1.4 - mostly at f/2.8, some at f/2 and f/4. ISO 160 - 2500.

Footage is ungraded, I did apply unsharp mask though.



#10 Julian

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Posted 05 March 2013 - 11:05 PM

Same footage as a few post above, this time with funky color grading (DaVinci Resolve Lite), some grain and unsharp mask (Premiere).

 







Also tagged with one or more of these keywords: Delrama, Old Delft, Oude, Delft, 8mm, 1.5x

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