What the heck is this thing?/Parellipshere Question

Schniapereli

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Nov 19, 2006
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Provo, Utah, United States
I found a full box of this thing and I have no idea what it is. I do not have a digital camera, but I did my best to draw it on Paint. :mrgreen:

It's just a lens behind a donut, which can be fastened to something by tightening the rubber and metal layes around it. (sandwich around what you want to clamp it to.)

It doesn't fit any of our fixtures, but I found a peice of one next to where we used to keep some parellipses.

I will try to get a digital picture.

But, what the heck is it called? What does it do? When do you use it?


Also, what was a parellipse used for? Do they still use them sometimes today? When would you use one? (is that the right spelling?)

If you know anything else about either, then please share. :grin:
 

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Van

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Hmm Can't be exactly sure. ok i'm sort of guessing. Possibly a degree changing lens for the paralipsphere ? I'mnot sure. Nice drawing though. As for thier original use Paralipspheres were an alternative to a Leko-lite, and were used the same way. I believe there are still a few left in the 2 world trade center theatre here in portland. I worked in that theatre for 7 years and we about 20 something para's < I Aint gonna keep typing it > we used them on evry show. They're not the greatest in the world but they work.
I can't say I ever saw that particular attachment however.
 

Schniapereli

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Nov 19, 2006
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Provo, Utah, United States
...I always call them parellipses... I can never remember their real name.

I'm not sure if it was for one of the PS's, but that's what I'm assuming since I know almost nothing about them. I cannot find anything on the internet.
(the only results are to this site.)
 

dbn

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Jan 4, 2005
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Derry, NH, USA
I'm guessing, too, but it looks like Van may be right. These look like they may be lenses that were intended to mount inside the barrel of an instrument via a narrow slot and slide back and forth for variable focus or zoom. The rubber layers and the tightening wing-nut look like they would accomodate holding the lens assembly stable within the barrel, by means of the slot. Or maybe it was a fixed position, rather than a slot. No way of telling, really.

I've never come across anything like this in my travels. Thanks for posting this. It has high entertainment value. :)
 

Van

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P.S. If I can get over to the world trade center I'll shoot a picture of some para-lipse-sphere's < god what a stupid name for a fixture>
 

Schniapereli

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Provo, Utah, United States
We have some old Paralipspheres, but they are broken, and do not seem to have a lamp bases, or a place to put them...

For others who are curious to know more about them, I have found this so far on the internet.

"The Paralipsphere is a further improvement of the ERS. It replaces the portion of the Ellipsoid behind the bulb with a parabolic reflector focused on the filament, and additionally replaces the portion of the Ellipsoid immediately surrounding the aperture with a spherical reflector focused on the bulb. Para(bola)+(El)lip(soidal)+Sphere = Paralipsphere. From a lighting design point of view, Paralipsphere's are merely a more efficient ERS, but from a technical point of view they are an interesting and significant variation."

...and that's about it.

I am going to stay after school one of these days (when I don't have too much homework) and I'm going to try putting the lense thingy in different fixtures, (hopefully, also take some pictures) and then report back to ya'll. :grin:
 

Van

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"The Paralipsphere is a further improvement of the ERS. It replaces the portion of the Ellipsoid behind the bulb with a parabolic reflector focused on the filament, and additionally replaces the portion of the Ellipsoid immediately surrounding the aperture with a spherical reflector focused on the bulb. Para(bola)+(El)lip(soidal)+Sphere = Paralipsphere. From a lighting design point of view, Paralipsphere's are merely a more efficient ERS, but from a technical point of view they are an interesting and significant variation."

:grin:
Hmm I don't know if I would call them an "Improvement" but they were definately different. Wow I tried like crazy and could find anything on the internet. I bow to your superior Google-ing skills.:p
 

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Heres some info on the 7367A Parellipisphere that I pulled of Wyg (and from what I could remember about them from using them 8 or so years ago). It was made by Electro Controls, is a zoom fixture (19 to 33 degs) though if I remember the zoom was a very loose term. Strangely they look very similar to the source4 zoom. But yes, the folks at cast got a hold of one and took the time to test it and get it into wyg.
 

sound_nerd

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Nov 24, 2004
Location
Toronto Ontario
We've got a dozen or so of them, although they were taken out of inventory this year and moved to the back of the lighting storage area....they never get used.
I'll try and take a few pictures tomorrow, get them up on here for those of you who don't know what they are.
 

ship

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P.S. If I can get over to the world trade center I'll shoot a picture of some para-lipse-sphere's < god what a stupid name for a fixture>
Didn't that place like go away a few years back? (This was only for entertainment response value quesioned... I realize that there is more than two towers to the complex.)

Snap a photo of what you are doing, Seen similar sub-lensed stuff in other brands including on my Linenbacher projectors but never played with any such stuff yet.

None of the sub lenses / slide lenses I'm thinking about on the other hand have any rubber parts so I might be way off in some gear I have never seen before.
 

ship

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Illinois
We have some old Paralipspheres, but they are broken, and do not seem to have a lamp bases, or a place to put them...
For others who are curious to know more about them, I have found this so far on the internet.
"The Paralipsphere is a further improvement of the ERS. It replaces the portion of the Ellipsoid behind the bulb with a parabolic reflector focused on the filament, and additionally replaces the portion of the Ellipsoid immediately surrounding the aperture with a spherical reflector focused on the bulb. Para(bola)+(El)lip(soidal)+Sphere = Paralipsphere. From a lighting design point of view, Paralipsphere's are merely a more efficient ERS, but from a technical point of view they are an interesting and significant variation."
...and that's about it.
I am going to stay after school one of these days (when I don't have too much homework) and I'm going to try putting the lense thingy in different fixtures, (hopefully, also take some pictures) and then report back to ya'll. :grin:
Big question is who makes the fixture, and what's the link to the website? Either or both answers will fill in a lot of info about the fixture or at least form a base of research to start with.
 

propmonkey

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Jul 22, 2004
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Milwaukee, WI
i enjoy them. i mean theyre from the 70's so you cant expect a great deal. the ones i use are 26-36 degree zooms.
 

ship

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Heres some info on the 7367A Parellipisphere that I pulled of Wyg (and from what I could remember about them from using them 8 or so years ago). It was made by Electro Controls, is a zoom fixture (19 to 33 degs) though if I remember the zoom was a very loose term. Strangely they look very similar to the source4 zoom. But yes, the folks at cast got a hold of one and took the time to test it and get it into wyg.
Believe I have an old Electro Controls catalog hanging about, What's the model number of the fixture? I'll have a look in the catalog but doubt it's old enough. Anything in Photometrics Handbook? Beyond that, what does "Wyg" mean?
 

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Van

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Didn't that place like go away a few years back? (This was only for entertainment response value quesioned... I realize that there is more than two towers to the complex.)
.
We Have a World Trade Center Complex here in Portland. 3 buildings connected by really cool sky bridges. Built in the 70's has a really cool look and a really crappy crappy theatre that I worked in for 7 years. It's actually a very intimate theatre. but the only access to load in to backstage is through an elevator. A man-sized elevator.
 

DarSax

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May 3, 2006
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Bethesda MD
Doo bee doo. Parellipshere information in the image below, sorry it's so small-attachment size limit.

To my knowledge, the Parellipsphere isn't a Paralipsphere. The former is a name of a fixture, the latter is a type of fixture (based on Schniapereli's comment). Parellipspheres are ellipsoidal reflector zoom spotlights.

And, for that matter, I don't think what you have is part of the Parellipsphere's lens train assembly. That general shape looks similar to the moving zoom lens on the Parellip, but the proportions are wrong and Parellip's dont have any rubber parts to speak of. If I get a chance tomorrow I'll pop open one of ours to see better what it looks like.
 

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ship

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wow! that's quite the fixture. Very much looks high tech in a Dr.Who (old school) type of way.

Nope, ... no idea anything about this fixture, I was more thinking a plano-convex based Fresnel looking fixture with a lens train sticking out of it. Interesting that it has an ellipsoidal reflector type rear end shape yet it's not using one, and a much more modern zoom front end. Very strange instrument. Be very interested in reading more if you can straighten out the graphics part of the spec for it.

Seen stuff like it - believe from Colortran in if memory serves some very inefficient dual ended RSC or Mini-can, never seen something the same exact look before.

Would love to tinker with your project - you have my jelousy on this one.