Fixed lens for 16:9 - AVS Forum
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post #1 of 7 Old 09-03-2013, 06:15 PM - Thread Starter
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I am building a new theater and am contemplating doing a scope screen.
I could use the projector's zoom feature to switch between 1.78 and 2.35, or I could thrown down 2.5k for a cinevista and scale the image for 1.78.

Which of these two methods would result in the highest quality image?
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post #2 of 7 Old 09-04-2013, 09:37 AM
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Quote:
Originally Posted by Decelerate View Post

I am building a new theater and am contemplating doing a scope screen.
I could use the projector's zoom feature to switch between 1.78 and 2.35, or I could thrown down 2.5k for a cinevista and scale the image for 1.78.

Which of these two methods would result in the highest quality image?

Of course the anamorphic lens since that gives an "optical zoom", with no loss of quality.

Using the projector to stretch is "digital zoom", which means you're just stretching the pic in horizontal and vertical directions. This results in loss of quality.
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post #3 of 7 Old 09-04-2013, 10:45 AM
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Originally Posted by smuggymba View Post

Of course the anamorphic lens since that gives an "optical zoom", with no loss of quality.

Using the projector to stretch is "digital zoom", which means you're just stretching the pic in horizontal and vertical directions. This results in loss of quality.

I think your heart is in the right place, but you're using entirely the wrong terminology and giving inaccurate information.

Here are two tutorials on the subject with pictures.

http://www.highdefdigest.com/news/show/2798
http://www.highdefdigest.com/blog/constant-image-height-refresher-2013/
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Originally Posted by Decelerate View Post

I am building a new theater and am contemplating doing a scope screen.
I could use the projector's zoom feature to switch between 1.78 and 2.35, or I could thrown down 2.5k for a cinevista and scale the image for 1.78.

Which of these two methods would result in the highest quality image?

The ideal scenario for maximum quality is to use an anamorphic lens for scope content which can be removed for non-scope content.

The zoom method will significantly cut your image's brightness. If you have a bright enough projector, this may not be a concern. However, it will also be problematic on the small handful of Blu-rays with alternating aspect ratios (The Dark Knight, The Dark Knight Rises, Tron Legacy, Transformers: Revenge of the Fallen Walmart exclusive Blu-ray).

A fixed lens like the CineVista (reviewed here) will compromise 16:9 content, because you'll be forced to scale it down to 1440x1080 resolution. Some people may not find that objectionable. Only you can decide what's important to you.

Josh Z
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post #4 of 7 Old 09-04-2013, 10:54 AM
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What matters is the message - anamorphic is better than zoom. I might have been a little less technical, I agree smile.gif Still learning.
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post #5 of 7 Old 09-05-2013, 01:09 PM
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Quote:
Originally Posted by Decelerate View Post

I am building a new theater and am contemplating doing a scope screen.
I could use the projector's zoom feature to switch between 1.78 and 2.35, or I could thrown down 2.5k for a cinevista and scale the image for 1.78.

Which of these two methods would result in the highest quality image?

It's hard to answer without knowing specifics - screen size, projector model, throw distance, etc. Generally speaking a fixed lens like the CineVista will optimize for 2.35:1, while zooming optimizes for 16:9.

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post #6 of 7 Old 09-05-2013, 01:58 PM
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Quote:
Originally Posted by smuggymba View Post

What matters is the message - anamorphic is better than zoom. I might have been a little less technical, I agree smile.gif Still learning.

No worries. We all have to start somewhere.

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post #7 of 7 Old 09-17-2013, 06:34 PM - Thread Starter
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Ok
I am still undecided on the projector choice. But here is a general question.
In order to keep the options open for either using the zoom method or an A-lens, should I calculate the mid throw distance for my projector using the 1.78 screen width or 2.35 screen width?
I am just trying to figure where to install my projector for the zoom method and A lens methods to work.
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