Cylindrical A-Lens Owner's Thread - Page 23 - AVS Forum | Home Theater Discussions And Reviews
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post #661 of 662 Old 06-17-2017, 07:09 PM
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I decided to pull that little CN made 1.33x A-Lens apart as it never seemed to focus. What I discovered was by flipping the lenses and adding a bit of length to the barrel, that this would focus aa sharp as my own MK5.

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post #662 of 662 Old 07-07-2017, 06:06 AM
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What patterns do you guys use to check the focus of the system?
I found these in the service menu of my BenQ to be really helpful.

One of the most annoying things to me is when text, particularly rolling credits change in focus from bottom to top. The vertical lines pattern is the easiest way to see if there is a problem. Other patterns just help prove over all focus.

NB the projector defaults to native lamp which looks really green and the camera had made those other artifacts visible.
The camera may not be showing true focus of the image.


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