Anamorphic lenses - AVS Forum
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post #1 of 9 Old 04-10-2001, 11:47 AM - Thread Starter
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I've been thinking about getting a D-ILA projector and want to get the most out of it as is possible. I have a limited throw distance (17 feet) and am thinking of doing the anamorphic lens thing to get a wider image. The panamorph is a bit out of the question since it only compresses the image. Most of the material I will be watching will be widescreen. Due to my budget, an ISCO II is out of the question for now. I have searched through past messages on the forum and found that the ISCO II seems to be the only candidate with regards to stretching the image with a D-ILA and I'm wondering why. I have seen a few ananmorphic lenses quite cheap on eBay and am wondering why many if not all of them cannot be used. My questions are:

How big (diameter) is the lens on a D-ILA (G10 or G11)?

What is the size (diameter) of the ISCO II (the side that goes next to the D-ILA lens)?

Are there any throw distance/zoom issues with the ISCO II and D-ILA?

What is the minimum size anamorphic lens that will work with a D-ILA?

Thanks for any info..

-- John
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post #2 of 9 Old 04-12-2001, 10:16 AM - Thread Starter
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Bump!

Anyone?

-- John
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post #3 of 9 Old 04-12-2001, 12:08 PM
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John:

Sorry, but I don't have the answers to your questions. Did you try JVC's web site?

I was curious about one thing, though. How big a screen do you want? If you're sitting between the projector and the screen, the projector should accomodate any reasonable image size you'd want. However, if you want the screen sized to be appropriate for viewing from more than 17 feet away, then it would make sense to expand the image...

Actually, you can use the JVC lens calculator to calculate throw distance/screen size. With a G11 at 17 feet, it shows that you could get a screen 8.9 feet wide!

- Dave
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post #4 of 9 Old 04-12-2001, 01:39 PM
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John,

Many people have tried the inexpensive anamorphic lenses, but being designed for small digital cameras they are too small for the exit image coming from the D-ILA which is about 3" wide and 2" tall (depending on image format). Plus many of the cheaper lenses have visibly lower picture quality.

I have the ISCO I lens and it looks very good, but cost $1300 a few months ago. If you are interested, I'd be willing to sell it for $750.

The ISCO II ($1450) has a bit clearer picture, and a 1.33 (rather that 1.44 horizontal stretch of the ISCO I), and less pincushioning (slight bowing of the picture at the corners), being a larger lens.

My G15 is 19 feet away from my 13' wide screen, so you can get a good sized image with a relatively short throw distance. The ISCO lens is slightly softer that the straight D-ILA picture, but more detailed (with full panel resolution)and notably brighter, looking more like a high-end CRT FPTV (and film). From further than 8' away there is no visible pixel gap with the 16:9 lens.

-Dean.
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post #5 of 9 Old 04-12-2001, 03:54 PM
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Dean,

what specific "inexpensive anamorphic lenses" are you referring too ? The lens in my NEC LT-84 is only about 2.2 inches in diameter and would be a good test bed for such lenses. Could you provide a little more information on them ?

Thanks,

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Sergio R.

Sergio Rivera - "It can always look better."
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post #6 of 9 Old 04-12-2001, 05:08 PM - Thread Starter
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Thanks for the replies!

Dave T:
I just did a re-measurement and my throw distance will be closer to 16 feet which would give me a little over 8 feet width. That's not bad and I may just be content to live with it but I would like to get the extra anamorphic width (my width will be limited to 11.5 feet) as well as the brightness from using an anamorphic lens. I will be sitting under the projector.. about 14-15 feet away from the screen.

Dean:
Thanks for the info. I may take you up on that Isco depending on how much my D-ILA will eventually cost along with calibration and screen.

LMDA1:
The lenses I'm refering to are:

http://cgi.ebay.com/aw-cgi/eBayISAPI...tem=1229288587
http://cgi.ebay.com/aw-cgi/eBayISAPI...tem=1228406996

-- John

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post #7 of 9 Old 04-12-2001, 08:09 PM
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John,

Even at 16' you will get a 72" x 96" 4:3 screen at 120" diag, which translates to a 54" x 96" 16:9 screen. That's pretty big! http://www.avsforum.com/ubb/smile.gif

With a 8' wide screen you really need the room to be about 14' wide so you can get the speakers in without them being in the way. (Unless of course you plan on building everything into the front wall) http://www.avsforum.com/ubb/frown.gif Which of course is the worst possible way to setup speakers if you really care about both music and movies.

Any-whew... unless you are wanting some sort of monster screen I think you'll do fine with your throw distance.



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www.premieraudiovideo.com

Later,

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post #8 of 9 Old 04-12-2001, 09:26 PM - Thread Starter
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I only have 11.5 feet width of projection wall available. The wall is really over 20 feet wide but there is a wet bar on one side and a fireplace on the other that hinder use of a bigger screen. I do not think I would want to go beyond 11 feet anyway. My speakers are a little bigger than bookshelf so I can place them above the fireplace and wet bar or in front of them. I'm not too worried about speaker placement. I would like to get the most out of my screen and projector though. That's why I'm trying to investigate more about anamorphic lenses.

I've come to the conclusion that any anamorphic lens for a D-ILA must be about 3 inches in diameter to properly capture and expand the whole image. There aren't too many lenses that will do this.

Thanks..

-- John
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post #9 of 9 Old 04-16-2001, 09:00 PM
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I have an ISCO-2 and it is indeed huge. It does do a great job though.

Dean's ISCO-1 sounds like a good deal.

Phil
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