Prismasonic HD-6000M vs Panamoph UH480 - AVS Forum
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post #1 of 6 Old 05-01-2012, 05:11 AM - Thread Starter
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Hi all,

I'm looking at these two lenses and needed some input. I'm shooting (not all purchased yet) 54" x 130" (140 diag) screen with an Epson 6010. My throw distance is 17.5'. Also will be using most of the lens shift to keep the projector higher.

I noticed on the UH480 that I'm just on the edge of the "optimal" throw distance. On the HD-6000 I didn't notice any range mentioned.

My questions are

1) which one is better given my situation? About the same?
2) will using lens shift give me any issues with the lenses?

Thanks!

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post #2 of 6 Old 05-03-2012, 04:56 AM
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My understanding is the HD6000 is a cylindrical lens design which is fundamentally better than the UH480's Prism based design, so it should definitely be the better lens. The tricky part is if it's enough better to justify any additional cost (I haven't kept up with the HD6000 prices).

Vertical lens shift shouldn't be a problem as long as its not "excessive".

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post #3 of 6 Old 05-03-2012, 06:15 AM
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Yzfbossman,

Here is the pdf of the UH480 Owners Manual And Install Guide.

http://www.panamorph.com/library/pro...SYS_Manual.pdf

It has all the info regarding Throw Distance, Throw Ratio and Lens Shift.


...Glenn
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post #4 of 6 Old 05-03-2012, 07:17 AM
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There are some 480 owner's who bought the prismasonic lens, they have posted some comparisons in the Prismasonic owner's thread:

http://www.avsforum.com/avs-vb/showt...hlight=rboster

If you use the search within a thread engine and UH480 or 480 or panamorph as your individual search words, you'll for their posts.

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post #5 of 6 Old 05-03-2012, 07:57 AM - Thread Starter
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Thanks guys

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post #6 of 6 Old 05-04-2012, 12:17 AM
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Quote:
Originally Posted by stanger89 View Post

My understanding is the HD6000 is a cylindrical lens design which is fundamentally better than the UH480's Prism based design

In brief, the lenses used in a cylindrical lens are just that - lenses, each with its own focal length (positive and negative in the case of an A-Lens). As I understand it, when the two lenses are aligned, both the pos and neg focal lengths are cancelled resulting in a device with infinite focus.

Prisms don't have a focal length so rely on additional elements being added to allow focus.

Quote:
Originally Posted by stanger89 View Post

Vertical lens shift shouldn't be a problem as long as its not "excessive".

It may or may not have a bearing and will be set up/projector dependent.

What I found with my own set up which has the projector shelf mounted level to the top of the screen (projector is not inverted in this case) is that my extreme lens shift usage (due to the way the projector is mounted) results is a slightly painful set up and alignment proceedure. As we all know, the HE A-Lens creates pincushion which kind of looks like )( only horizontally. When the A-Lens/projector is mounted high (as is the case with mine), the pincushion tends to be uneven, so it common practice to tilt the A-Lens towards the centre of the screen. However, too much tilt and the shape of the pincushion goes from )( to )), so even with a curved screen, you will get geometry issues.

When I built my curved screen, I made it with adjustments for both the top and bottom, so I could correct )) by offsetting the amount of curve top to bottom. I would rather not do that, so learned how to "optically" balance the pincushion to )( and let the curve of the screen do what it is supposed to do. The end result is no geometric distortions and lovely straight horizontal lines.

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