Comtemplating the 2.35:1 screen... - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #21 of 88 Old 01-28-09, 12:40 PM
Mark Techer
 
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Re: Comtemplating the 2.35:1 screen...

Correct. There are two basic modes you need to do this -Vertical Stretch and Horizontal Squeeze. Then you can watch both 1.78:1 and 2.37:1 with the lens in place and switch ARs with the remote of the projector...

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post #22 of 88 Old 01-28-09, 01:15 PM Thread Starter
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Re: Comtemplating the 2.35:1 screen...

With all of the projectors I have owned... I didn't have to switch AR with the remote... it was automatic. Would this be something different, or are you familiar with this projector?
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post #23 of 88 Old 01-28-09, 01:23 PM Thread Starter
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Re: Comtemplating the 2.35:1 screen...

I know I am full of questions, but this has my interest indeed.

Are you familiar with Home Theater Brothers lens that is $610 shipped?

What do they mean by: Best results are achieved with throw ratios above 1.7?

Thanks for all the help!
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post #24 of 88 Old 01-28-09, 04:48 PM
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Re: Comtemplating the 2.35:1 screen...

The HTB lens is the one I suggested at $600.00..
By all accounts, It's quite a good lens...

The TR they mentioned is the recommended minimum TR to keep pincushion to a minimum..
You can have a slightly lower TR and still be able to use the lens, but you will have a little bit more pincushion effect..

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post #25 of 88 Old 01-28-09, 05:41 PM Thread Starter
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Re: Comtemplating the 2.35:1 screen...

What is 1.7 in relation to though?

Projector needs to be mounted 1.7 times the width of image?

120" width... projector needs to be mounted at least 17' from screen?
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post #26 of 88 Old 01-28-09, 05:53 PM
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Re: Comtemplating the 2.35:1 screen...

That is correct..

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post #27 of 88 Old 01-28-09, 06:19 PM
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Re: Comtemplating the 2.35:1 screen...

I should have mentioned that the image width refers to the width of a !6:9 image..

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post #28 of 88 Old 01-28-09, 07:57 PM Thread Starter
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Re: Comtemplating the 2.35:1 screen...

Well... even if it was for the 2.35:1 image of my proposed 120-122" screen, which would be about 17'... that is not a problem. Most likely I will end up being at 17' 6" for a zoom of 1:1 at 16:9.

I am still a little confused about what has to be done on the HC6500 in order to switch between formats, if anything. Hopefully it is just a push of a button, or maybe nothing. I don't want to have to focus the image every time I change the format... or adjust lens shift. I am assuming I will have CIH, but not sure. I probably just need to research the projector features more and find someone who owns one and is using a lens.
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post #29 of 88 Old 01-28-09, 09:36 PM
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Re: Comtemplating the 2.35:1 screen...

When you said the AR is Automatically changed, I have to assume that you are referring to 16:9 screens where the Scope AR is simply letter boxed. CIH means that there are no black bars and because the image is 33% wider than a 16:9 image of the same height, you do have to select a different opperating mode. When using a lens on the Panny projectors, you switch between 4 x 3 and Zoom1. You do not use the 16:9 mode with the lens in place. Yes I am familiar with these projectors.

Your TR is found by dividing the native 16:9 image width into the distance between the screen surface and the projector's lens. Therefore, if your Scope screen is 118" wide, then the 16:9 portion will be 88.5". You then can times 88.5 by the TR to find the mounting distance you need, or you divide that into the distance from the screen to the projector's lens to work out the TR.

88.5 x 1.7 = 150.45". I personally would be looking to extend the TR to at least 2.0:1 to reduce the pincushion and even help reduce some of the CA that you might see from a 2 prisms (2 element) lens. The CA reduction is due to lessening the angles of the beam. CA will always be visible in such a lens, but if you can reduce it, then you should make the effort to do so...

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post #30 of 88 Old 01-28-09, 11:51 PM Thread Starter
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Re: Comtemplating the 2.35:1 screen...

Quote:
Mark Techer wrote: View Post
When you said the AR is Automatically changed, I have to assume that you are referring to 16:9 screens where the Scope AR is simply letter boxed.
Yes... if I insert a 16:9 AR DVD, it shows 16:9... if I insert a 2.35:1 or 2.40:1 DVD, it has black bars on top and bottom. If I insert a 4:3 DVD, it has black bars on both sides. No buttons are required to push... no focus adjustment... no lens shifting... just insert and press play.

Quote:
Mark Techer wrote: View Post
CIH means that there are no black bars and because the image is 33% wider than a 16:9 image of the same height, you do have to select a different opperating mode. When using a lens on the Panny projectors, you switch between 4 x 3 and Zoom1.
So... does the anamorphic lens give me CIH?

Quote:
Mark Techer wrote: View Post
You do not use the 16:9 mode with the lens in place.
So why does Mitsubishi state that you do not have to remove the lens to view 16:9 images?

From Mitsubishi:
Quote:
The HC6500 has Mitsubishi's dual anamorphic modes, which allow the user to forego the articulated track usually paired with an anamorphic lens. Instead, the HC6500 scales all content for proper display through an anamorphic lens, and the lens remains deployed at all times.

Quote:
Mark Techer wrote: View Post
Your TR is found by dividing the native 16:9 image width into the distance between the screen surface and the projector's lens. Therefore, if your Scope screen is 118" wide, then the 16:9 portion will be 88.5". You then can times 88.5 by the TR to find the mounting distance you need, or you divide that into the distance from the screen to the projector's lens to work out the TR.

88.5 x 1.7 = 150.45". I personally would be looking to extend the TR to at least 2.0:1 to reduce the pincushion and even help reduce some of the CA that you might see from a 2 prisms (2 element) lens. The CA reduction is due to lessening the angles of the beam. CA will always be visible in such a lens, but if you can reduce it, then you should make the effort to do so...
So... if I want my 16:9 AR image to be 102" wide, the projector should preferably be mounted at 204" (or 17'). So my 17.6' is looking good.

What is CA? I thought the image with this lens setup is supposed to be much better than without it. It sounds like it might be hindered in some way or another.
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