AVS Forum Special Member
Join Date: Aug 2005
Location: Brisbane, Australia
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Only just found this, so sorry for the late response.
The slide is a variable compensation control for different display brightness. There is no hard rule for where it needs to go as it is meant to be used to optimize your display in your set up. An LED back lit TV might allow it to be pushed up to 1000nits where a projector wants it closer to 300.
Default is 300, but that does not mean it limits to just 300 nits. If it did, then the range should be going well past 1600nits.
From my findings, 250 actually worked the best on most HDR-10 titles with my projector.
The lower you go, the harder the tone mapping has to work and as a result, you may experience white crush and a flash where the crushed detail is briefly visible. I found this to be the most annoying aspect and the only "cure" is to raise contrast on the display, and readjust this control. It never fully solves the issue though as different studios master at different levels and it almost seems to be a title by title adjustment.
I love my Constant Image Height system!