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Topic: Keystone Correction/Aspect Ratio Problem
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Joined: Dec 1, 2019
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Hello forum members, first time poster here!

I own a BenQ HT2550 projector, and to cut a long story short, due to a few oversights with my first home theatre setup I need to eliminate some keystoning present on my image with keystone correction.

The problem I am facing is that when I introduce keystone correction, the aspect ratio of the image is not maintained. For example, with no correction I am able to produce an exact 16:9 formatted image, however with a keystone of -5 the aspect ratio goes from 1.77 to 1.82 when measured, and I end up with a 1 inch bar at the top and bottom of the screen (i.e. for the same image width, the height is reduced).

In order for keystone correction to be useful shouldn't it maintain the same aspect ratio when adjusting the image, or is this a side effect of the correction process that I will have to live with?

Thanks for reading,

Lee.
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Joined: Mar 28, 2005
Posts: 12,659
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This is good to note, and you should email BenQ directly about this problem if it is occurring. They may be able to fix this through a firmware update (which you will need to load through USB)...

This isn't a 'normal' issue, but certainly points to the importance of avoiding the use of digital keystone correction if at all possible.

I realize this is too little too late for your specific installation, but hopefully reminds other who may come here to measure ten times and ask questions if they still aren't sure.

Yeah, there's just no real solution if you are in this place now, but sending BenQ an email and checking for firmware updates really can make a huge difference.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
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Joined: Dec 1, 2019
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Thanks for the feedback and the suggestion. I will contact BenQ about the issue and post back when I receive a response along with the outcome.