Originally Posted by LarryChanin
Just to clarify, in this case of closing the iris you mentioned earlier that ANSI contrast would decrease, not increase. So I guess the the blacks would be less deep.
Yes, the ANSI contrast would decrease so blacks within a brighter scene
would be less deep. The absolute black level will be lower for fade to black and very dark scenes.
Originally Posted by erkq
Just to clarify: A bright image does not create white crush. A poorly calibrated gamma curve does. Mis-matched video level can too, but that's pretty obvious something's wrong.
White crush is more likely caused by having the contrast set too high. However, if the gamma is too low at the higher IREs you will lose detail.
Originally Posted by Canary_Jules
One question. If closing the iris reduces ANSI and increases ON/OFF contrast what effect would using an ND2 or other ND filter have?
Adding an ND filter will reduce ANSI contrast (due to inevitable reflections back into the projector's lens, even with a coated filter there will still be some). The cheap resin type filters are very poor in this case (I tried one with a previous projector and a quality glass coated Hoya was muchh better in this regard). However an ND filter will not
increase on/off contrast, so this is where having a manual iris wins over filters.
PS. I don't consider that I'm an 'expert' just answering some of the points raised since my last post.