AVS Special Member
Join Date: Aug 2005
Location: Brisbane, Australia
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Regardless if you are using an A-Lens of not, you can sit 2x the image. Note the word image and not screen. Because both the zoom shrink method have light spill top and bottom of the Scope screen, so you need to be 2x of the image.
So if you have a 5' tall screen, with an A-Lens you can sit 10'. Zoom or Shrink will have you no closer than 13' 4".
I love my Constant Image Height system!