Vertical Offset Calc Check - BenQ 1070 - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 6 Old 05-12-2016, 07:03 AM - Thread Starter
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Vertical Offset Calc Check - BenQ 1070

I want to make sure I understand this perfectly because I am in a height limited room (~7'). I am using a BenQ 1070 as an example and reading from their owners manual.

(using page 16: http://www.projectorcentral.com/pdf/...anual_7265.pdf)


Manual says (mm):

For 120 inch diag 16:9 screen, lens position is 75mm (2.95 inched)

I take that as the vertical distance between the mid lens DOWN to top of screen s/b 2.95 inches. Correct?
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post #2 of 6 Old 05-12-2016, 07:09 AM
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When the projector is mounted upside down, the center of the lens needs to be about 3" to 5" above the top of the screen. The W1070 has lens shift so it can be adjusted a couple of inches up or down from that point. So perhaps 2" to 7" as a typical range of motion using lens shift.

3" to 5" is a pretty typical height range and the inclusion of that lens shift means you don't have to be exactly exact.

Middle of lens to top of image is correct.

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post #3 of 6 Old 05-15-2016, 12:23 PM
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Quote:
Originally Posted by meegwell View Post
I want to make sure I understand this perfectly because I am in a height limited room (~7'). I am using a BenQ 1070 as an example and reading from their owners manual.

(using page 16: http://www.projectorcentral.com/pdf/...anual_7265.pdf)


Manual says (mm):

For 120 inch diag 16:9 screen, lens position is 75mm (2.95 inched)

I take that as the vertical distance between the mid lens DOWN to top of screen s/b 2.95 inches. Correct?
So good that you asked!
I had the same question for my W1070+, its manual does not tell that much as the one for W1070.
There is a figure explaining it, look closer: 75mm is the allowable maximum distance from the center of the lens and the view area in case of a 120 inch screen. This is "E". In case of ceiling mounting the 75mm should be counted of course from the top of the screen, while in case of floor installation, it should be counted from the bottom of the screen.

As it is a distance and not an angle given, I have one concern; none of the manuals mention if it has to be considered for the average throw distance (in your example it is 3494mm), or something else...
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post #4 of 6 Old 05-15-2016, 07:50 PM
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Quote:
Originally Posted by meegwell View Post
I want to make sure I understand this perfectly because I am in a height limited room
Height limited now? Didn't you start a thread titled "Width Limted" also? https://www.avsforum.com/forum/117-2-...-9-screen.html

I guess most rooms are both height and width limited in a literal sense...
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post #5 of 6 Old 05-16-2016, 04:38 PM - Thread Starter
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Originally Posted by NxNW View Post
Height limited now? Didn't you start a thread titled "Width Limted" also? https://www.avsforum.com/forum/117-2-...-9-screen.html

I guess most rooms are both height and width limited in a literal sense...
Yes! It is a basement with low ceiling. My width limit is not a room width issue but rather an issue with a built in desk. The room is probably 16 x 29. Anyhow, that width limited thread has taken on a life of its own!
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post #6 of 6 Old 05-16-2016, 04:42 PM - Thread Starter
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To the left and right of the built in speakers are now built in desks - that gives me about 110" max w to work with.

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