Is a conversion lens a bad idea? - AVS Forum
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Old 02-07-2013, 02:48 PM - Thread Starter
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My Benq 7000 can't fill my screens 96" width because my room is only 13' deep. Would a conversion lens work well? The Benq is the only 3D DLP that will work for me since I can only put it on a rear shelf within the screen vertically. It is only being used for 3D. I only want DLP for 3D due to it's ZERO crosstalk. I use a ceiling mounted JVC for 2d. The JVC can't be shelf mounted because it's depth would block my rear wall speakers.

Thanks,
Tom

My equipment: JVC RS55 for 2D, BenQ W7000 for 3D, Carada 40x117 2.925:1 AR BW Criterion screen, Navatar .8 HD conversion lens, Darbee Darblet, region free Oppo BP93, Toshiba HD-A35 HD-DVD, JVC HD-DH5U D-Theater, Mitsubishi HS-HD 20000 DVHS, Pioneer CLD-97 LD player/AC-3 mod, B&K AC3 Demodulator
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Old 02-07-2013, 02:55 PM
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The issue is cost. A good conversion lens such as the Navitar Screenstar HDSSW065 costs almost as much as the BenQ W7000 does.
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Old 02-07-2013, 03:01 PM - Thread Starter
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I would be willing to spend the cash if I knew it would not degrade the picture and accomplish my goal.

My equipment: JVC RS55 for 2D, BenQ W7000 for 3D, Carada 40x117 2.925:1 AR BW Criterion screen, Navatar .8 HD conversion lens, Darbee Darblet, region free Oppo BP93, Toshiba HD-A35 HD-DVD, JVC HD-DH5U D-Theater, Mitsubishi HS-HD 20000 DVHS, Pioneer CLD-97 LD player/AC-3 mod, B&K AC3 Demodulator
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Old 02-07-2013, 03:35 PM
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The lens I mentioned will get the job done as you need it.
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Old 02-07-2013, 03:59 PM - Thread Starter
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Would their 0.8x lens also work in my setup? I see it's a little cheaper than the 0.65.

The W7000 zoomed all the way out gives an image around 85" wide. I would need 96" wide plus a little spillover just to be safe.

Tom

My equipment: JVC RS55 for 2D, BenQ W7000 for 3D, Carada 40x117 2.925:1 AR BW Criterion screen, Navatar .8 HD conversion lens, Darbee Darblet, region free Oppo BP93, Toshiba HD-A35 HD-DVD, JVC HD-DH5U D-Theater, Mitsubishi HS-HD 20000 DVHS, Pioneer CLD-97 LD player/AC-3 mod, B&K AC3 Demodulator
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Old 02-07-2013, 04:08 PM
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Yeah it should still work. All you need to do is figure out the closest throw distance possible for your screen size and multiply by .8 and that's how much closer you can put your projector.
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Old 02-07-2013, 04:19 PM - Thread Starter
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Thanks:)

Graig Peer had the .65 in the classifieds for around $1K. I just spoke with him and he said that it recently sold. Every single time I try to buy a projector on this form I'm always too late. I feel like crying.frown.gif

Tom

My equipment: JVC RS55 for 2D, BenQ W7000 for 3D, Carada 40x117 2.925:1 AR BW Criterion screen, Navatar .8 HD conversion lens, Darbee Darblet, region free Oppo BP93, Toshiba HD-A35 HD-DVD, JVC HD-DH5U D-Theater, Mitsubishi HS-HD 20000 DVHS, Pioneer CLD-97 LD player/AC-3 mod, B&K AC3 Demodulator
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Old 02-07-2013, 05:15 PM
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Quote:
Originally Posted by Tom Monahan View Post

Thanks:)

Graig Peer had the .65 in the classifieds for around $1K. I just spoke with him and he said that it recently sold. Every single time I try to buy a projector on this form I'm always too late. I feel like crying.frown.gif

Tom

No way to poke a hole in the back wall to get the Benq back a bit?

Location: Beaverton, Oregon
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Old 02-07-2013, 05:35 PM
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Quote:
Originally Posted by Tom Monahan View Post

Would their 0.8x lens also work in my setup? I see it's a little cheaper than the 0.65.

The W7000 zoomed all the way out gives an image around 85" wide. I would need 96" wide plus a little spillover just to be safe.

Tom

Yes the 0.8 will work for you Thomas. I sent you an email.

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Old 02-07-2013, 06:23 PM
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Another possibility is to fire the pj sideways and reflect it off of a first-surface mirror.

The image would be about 12" wide at a point that would add the requisite throw distance, so the mirror would need to 1.414 x 12 = 17" wide, and 7" tall.

I might have one close to that size from a RP project I bailed on; PM me if interested and I'll see if I can find it.

Noah
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Old 02-08-2013, 11:10 AM - Thread Starter
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Originally Posted by AV Science Sales 5 View Post

Yes the 0.8 will work for you Thomas. I sent you an email.

E-mail received. If I can get my w7000 ringing issue solved, I'll call you and order that 0.8 conversion lens. Thanks as always for the help.smile.gif

Tom

My equipment: JVC RS55 for 2D, BenQ W7000 for 3D, Carada 40x117 2.925:1 AR BW Criterion screen, Navatar .8 HD conversion lens, Darbee Darblet, region free Oppo BP93, Toshiba HD-A35 HD-DVD, JVC HD-DH5U D-Theater, Mitsubishi HS-HD 20000 DVHS, Pioneer CLD-97 LD player/AC-3 mod, B&K AC3 Demodulator
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Old 02-08-2013, 11:13 AM - Thread Starter
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Originally Posted by GoCaboNow View Post

No way to poke a hole in the back wall to get the Benq back a bit?

No.

The back wall is shared with my living room. If I were single I would do it.

Tom

My equipment: JVC RS55 for 2D, BenQ W7000 for 3D, Carada 40x117 2.925:1 AR BW Criterion screen, Navatar .8 HD conversion lens, Darbee Darblet, region free Oppo BP93, Toshiba HD-A35 HD-DVD, JVC HD-DH5U D-Theater, Mitsubishi HS-HD 20000 DVHS, Pioneer CLD-97 LD player/AC-3 mod, B&K AC3 Demodulator
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Old 02-08-2013, 11:20 AM - Thread Starter
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Thanks, but WAY over my head.

Tom

My equipment: JVC RS55 for 2D, BenQ W7000 for 3D, Carada 40x117 2.925:1 AR BW Criterion screen, Navatar .8 HD conversion lens, Darbee Darblet, region free Oppo BP93, Toshiba HD-A35 HD-DVD, JVC HD-DH5U D-Theater, Mitsubishi HS-HD 20000 DVHS, Pioneer CLD-97 LD player/AC-3 mod, B&K AC3 Demodulator
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Old 02-09-2013, 02:00 AM
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Originally Posted by Tom Monahan View Post

Thanks, but WAY over my head.

Tom

He's just talking about putting the projector off to one side and pointing it at a mirror.
Here's a super-crude drawing that I whipped up in 30 seconds to illustrate.

http://img824.imageshack.us/img824/4571/frontmirror.png

This approach is probably about 10x cheaper than going with a lens and much less likely to have distortion since a flat mirror is a lot easier to make than a distortion-free lens.

Copyright is not property, it is merely a temporary loan from the public domain.
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Old 02-09-2013, 02:59 PM - Thread Starter
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Very cool. Thanks for taking out the time to do that. Unfortunately, it wouldn't wok in my room.

Tom

My equipment: JVC RS55 for 2D, BenQ W7000 for 3D, Carada 40x117 2.925:1 AR BW Criterion screen, Navatar .8 HD conversion lens, Darbee Darblet, region free Oppo BP93, Toshiba HD-A35 HD-DVD, JVC HD-DH5U D-Theater, Mitsubishi HS-HD 20000 DVHS, Pioneer CLD-97 LD player/AC-3 mod, B&K AC3 Demodulator
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Old 02-09-2013, 03:12 PM
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Quote:
Originally Posted by JerryW View Post

He's just talking about putting the projector off to one side and pointing it at a mirror.
Here's a super-crude drawing that I whipped up in 30 seconds to illustrate.

http://img824.imageshack.us/img824/4571/frontmirror.png

This approach is probably about 10x cheaper than going with a lens and much less likely to have distortion since a flat mirror is a lot easier to make than a distortion-free lens.

Where could one obtain a mountable mirror at 45 degrees (like depicted)? Do people get their protractor out and measure for themselves and glue one piece of mirror at the appropriate angle to the wall?
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Old 02-11-2013, 12:24 PM
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10 points for Jerry smile.gif
Quote:
Originally Posted by Seegs108 View Post

Where could one obtain a mountable mirror at 45 degrees (like depicted)? Do people get their protractor out and measure for themselves and glue one piece of mirror at the appropriate angle to the wall?

The mirror would require stable mounting to the wall or a stand, same as the pj.

Mysteries such as where to procure such an arcane device can be solved by targeted application of internet search technologies

Noah
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Old 03-03-2013, 04:17 PM - Thread Starter
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It was expensive, but boy that .8 Navitar is a heck of a lens. I see zero reduction in any picture category with it in place. Now I can have the 7000 fill my entire scope screen for 3D and animation 2D. Probably the best thing about it is ease of placement. I can easily switch it to use on my 2D JVC projector. I use constant height zoom with a 2.4:1 screen. Now with the Navitar, I can zoom the JVC out enough to move to a 2.77 ish scope screen for films like Ben Hur. Even 2.81 for How the West Was Won could work. This would eliminate all horizontal black bars leaving just side bars to mask..



Thanks to all for answering my questions gentlemen.smile.gif

I order from Mike and he was willing to ship Priority so I could get it yesterday.

By the way, the size and weight of this thing was shocking. If ever a lens looked like it is worth over 1k, this is it.

If AVS sells what I'm looking for, I will always buy from them. Mike Garrett is one one of the finest people I have dealt with in my 48 years of life. ORDER FROM HIM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Tom

My equipment: JVC RS55 for 2D, BenQ W7000 for 3D, Carada 40x117 2.925:1 AR BW Criterion screen, Navatar .8 HD conversion lens, Darbee Darblet, region free Oppo BP93, Toshiba HD-A35 HD-DVD, JVC HD-DH5U D-Theater, Mitsubishi HS-HD 20000 DVHS, Pioneer CLD-97 LD player/AC-3 mod, B&K AC3 Demodulator
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Old 03-07-2013, 03:35 PM
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By the way, the size and weight of this thing was shocking. If ever a lens looked like it is worth over 1k, this is it.

Ya, the Navitar lenses are impressive items - you got a nice piece of glass !! biggrin.gif

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