Pics of my 235:1 lens and DLP projector ! - AVS Forum
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post #1 of 24 Old 05-06-2001, 12:06 PM - Thread Starter
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Here are a couple of pics of my 235 scope lens and projector as promised in another thread.

The following dvd shots are using the full 800x600 dlp panel stretched to the proper ratio using the lens.
This gives me plenty of light output and enough pixel count for a bright smooth film like image.

Here is my Isco 35mm 235:1 lens. I paid $500.
http://www.avsforum.com/images/avs-lens1.jpg

This is the lens setting in the mount that came with the Isco 16x9 anamorphic lens. The projector is the Seleco HT200.

http://www.avsforum.com/images/avs-lens2.jpg

Here is the results. A couple of shots from the dvd Charlies Angels.
The image is 7 feet wide and is shot onto my light gray wall.
You cannot see any pixel structure from 6 feet away.

http://www.avsforum.com/images/avs-lens3.jpg

http://www.avsforum.com/images/avs-lens4.jpg


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[This message has been edited by David Bott (edited 05-06-2001).]
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post #2 of 24 Old 05-06-2001, 12:13 PM
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I don't seem to see the images.

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post #3 of 24 Old 05-06-2001, 12:23 PM
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Fixed. http://www.avsforum.com/ubb/smile.gif

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post #4 of 24 Old 05-06-2001, 12:33 PM
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Will that lens fit into a JVC M2000?

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post #5 of 24 Old 05-06-2001, 12:40 PM - Thread Starter
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Ken

The opening to the scope lens is on the small side.
It will work well with the M2000 if you chose the long throw lens option
but with the stock lens of 1.9 to 2.8 it will not.



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post #6 of 24 Old 05-06-2001, 12:43 PM
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I asked and you provided...

..it looks sensational (as I have previously indicated I have found a few variable prism devices and I have a plan...)... I would like to see these in larger resolution shots but this will do for now...

...it appears there is some barrel distortion (esp visible in the Bill Murray shot) but a unconsidered benefit is lack of halo etc.. This had not occurred to me but would be a welcome side effect...

Really looking forward to some 'turret' construction pics...

Where did you pick that up for $500 ???

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[This message has been edited by Phat Phreddy (edited 05-06-2001).]


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post #7 of 24 Old 05-06-2001, 12:44 PM
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Alan, I assume that it can't replace the lens with an adaptor. Is that true?

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post #8 of 24 Old 05-06-2001, 01:41 PM - Thread Starter
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Ken

If I understand your question correctly the answer is no.
This lens works as a stand alone and must be placed in front of the projectors primary lens.

Phat

You can find these at 35mm theater supply houses. Make sure you
get one with a short throw.

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post #9 of 24 Old 05-06-2001, 02:04 PM
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wow!! no words. yes, some words: http://www.avsforum.com/ubb/smile.gif

what did you as source: a Vigatec, a cinematrix, an htpc, to output a true 21:9 anamorphic ?

where on the net can these lenses be found , I mean, at those acceptable prices ?

thanks and congrats!!

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post #10 of 24 Old 05-06-2001, 02:31 PM - Thread Starter
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www.film-tech.com has a forum and a classified section.

I use a HTPC with the radian card.

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post #11 of 24 Old 05-06-2001, 04:13 PM
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Hi Alan

It looks great. But, do you have the pictures in a larger scale (if that's what you call it)?

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post #12 of 24 Old 05-06-2001, 04:24 PM
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Very nice Allen
Nice job

Would this work on a Dila or is the diameter of the lense too big for this lense to work.

Just trying to find a cheaper way for the pana?


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post #13 of 24 Old 05-06-2001, 05:05 PM
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Alan,

What are the specs (MM size, throw, etc) of your lens?

Also, in your research, have you found any 2.35:1 lenses with a big enough lens opening to work with the normal G15 zoom lens?

Like you, I can size the image fine for a 2:1, or 2.4:1 lens with my HTPC, but I'm more concerned with getting the corners of the image clipped off, barrel distortion, light loss, uneven-focus, and general quality.

-Dean.
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post #14 of 24 Old 05-06-2001, 06:17 PM
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Dean,

Your concerns are very valid. I have a few 35 MM CinemaScope lenses and none of them work very well with my projector. The main problems are cutting off the corners of the image, and focus.

The lenses I have are for longer throw applications found in a commercial theater. Alan's lens was designed for shorter throw applications like the smaller stadium style theaters.

As Shawn Kelly has pointed out before, the aperture size of the lens needs to be large in order to account for the wide variety of projectors being used for home theater.
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post #15 of 24 Old 05-06-2001, 06:27 PM - Thread Starter
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As Joe pointed out the aperture on most projectors including the Dila will not work with a stock 35mm scope lens. The Seleco dlp with its long throw is one of the few that will.
I also bought a long throw replacement lens for my Dwin Transvision from isco. This is a direct replacement lens made for this projector and now I can use my scope lens with this projector as well!



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post #16 of 24 Old 05-06-2001, 08:25 PM
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Now that Phil Simms, er, Alan Gouger, has ingenuity.
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post #17 of 24 Old 05-06-2001, 09:08 PM
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Hi Alan,

if money is no object, is there any scope lens out there by isco or other companies that has large enough diameter that we could use in front of our dila stock lens. if would great to know such lens exists so we could, at least, dream about it. thanks

seng
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post #18 of 24 Old 05-07-2001, 12:59 AM
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wow , THIS is something to write home about http://www.avsforum.com/ubb/wink.gif

I am now for a few months buying all sorts of lenses, and already have a collection of them, mostly primaries with anamorphic atachments, and I think of taking the original lens out of the projector and completely replacing it.
You have your original lens intact? or did you replace it all?
Anyone else ever tried this with some other lenses? Schneider lenses are top and therefore quite expensive, and hard to get, I regulary check filmech and this did slip by, a great buy I must say, congratulations! http://www.avsforum.com/ubb/smile.gif
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post #19 of 24 Old 05-07-2001, 02:45 AM
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Alan, where is this scope described on http://www.iscooptic.de/english.html and what is its exact name because I don't find it !

Thanks
Emmanuel
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post #20 of 24 Old 05-07-2001, 04:37 AM
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I think you can find more abou these lenses here:
http://www.schneideroptics.com/projection/mppro.htm

as this is a schneider lens.
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post #21 of 24 Old 05-07-2001, 06:51 AM - Thread Starter
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Yes I have a Schneider MC cinelux series.
It can focus down to 17 feet.

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post #22 of 24 Old 05-07-2001, 08:01 AM
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I found this on http://www.schneideroptics.com/projection/es/es.htm which is the URL for the new "ES Cinelux Anamorphic 2X MC projection lens"

Apparently, these lens seems OK for HT because "they have a tube diameter of 70.65mm and their minimum projection distance is 3 meters (9 feet). Because of their wide focal length and focusing range, they are the solution for wide screen multiplex theatres, as well as screening rooms."

So the anamorphic attachment is the ES Super Cinelux Anamorphic 2X (producd id 52-017744) and costs $2600.

Is this lens OK ?

I also saw dedicated Digital Projection lenses (Cine-Digitar products) for D-cinema. there is a 1.5x Anamorphic lens and a 1.9x anamorphic lens.

Emmanuel


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post #23 of 24 Old 05-08-2001, 01:24 PM
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Alan,
I think you may have created a Frankenstein here. http://www.avsforum.com/ubb/biggrin.gif

Guys, let me briefly share a few things with you.

1) I also own a short throw MC Cinelux.

2) The picture (with scope movies) does look good.

3) Problem is, the lens stretches the image horizontally by 2X.

4) As a result, scope movies are more like 2.66:1, than 2.35:1.

5) To regain the correct geometry, you have to drop about 12.5% of the horizontal resolution.

6) Whether or not you drop horizontal resolution, you have still magnified vertical pixel gap by 2X. This is visible in SVGA machines. It produced what looked like aliasing on my DL450. I've been told that on a D-ILA this isn't an issue.

7) To avoid vignetting, you need to have a very tiny image on the scope lens. This means you either need to buy a projector which already has a long throw, or you need to change the projector's lens. This change will lengthen the throw, perhaps significantly.

8) Don't forget this lens makes sense only if you use it to watch 2.35:1 (scope) material. For 1.85:1 movies, you will need to either remove the (cinemascope) lens, or drop a lot of horizontal resolution.

I was very impressed with the image through a cinemascope lens. But I think the Panamorph or ISCO lenses will give the best overall results, with the least effort. http://www.avsforum.com/ubb/wink.gif
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post #24 of 24 Old 05-08-2001, 03:26 PM
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Wow! I sure wish this lens would work on a D-ILA, that would be interesting to see. I would love to use a 2.0:1 or higher aspect ratio screen.

Brian

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