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moudugnou a écrit :
J'ai juste une question con, ça le fait sur plusieurs films/extraits ?
DAVID555 a écrit :Shacrad il est de combien le gain de ton ecran?
Un gain élevé peut provoquer un effet de spot central puisqu'il y canalise la luminosité (gain 1.5, 50% de la lum au centre de l'écran).
However, I really don't recommend using this PJ at dead centre as you get the worst ANSI contrast in this position and these models aren't blessed with the highest figure to start with. Manni01 actually measured this somewhere on the HD750 thread and I've had practical experience of the effect as at dead centre (to help when I used to zoom...although I did get better ): I found that at dead centre when there were end credits scrolling down the screen I could see a reverse 'ghost' image going the opposite way a little to one side of the screen. Moving my HD350 to level with the top of the screen and applying the appropriate amount of lens shift cured this issue and by inferance improved ANSI contrast as any bright parts of the image that 'ghost' over dark parts would raise the black levels in those parts. Unfortunately you do get the sharpest image at dead centre, so it is a compromise...enough lens shift to cure the ghosting, but not enough to noticably decrease the sharpness.
Grubert a écrit :J'ai trouvé un cas similaire sur AVSforum:However, I really don't recommend using this PJ at dead centre as you get the worst ANSI contrast in this position and these models aren't blessed with the highest figure to start with. Manni01 actually measured this somewhere on the HD750 thread and I've had practical experience of the effect as at dead centre (to help when I used to zoom...although I did get better ): I found that at dead centre when there were end credits scrolling down the screen I could see a reverse 'ghost' image going the opposite way a little to one side of the screen. Moving my HD350 to level with the top of the screen and applying the appropriate amount of lens shift cured this issue and by inferance improved ANSI contrast as any bright parts of the image that 'ghost' over dark parts would raise the black levels in those parts. Unfortunately you do get the sharpest image at dead centre, so it is a compromise...enough lens shift to cure the ghosting, but not enough to noticably decrease the sharpness.
Tu es au zéro lens shift? (càd projo pile au centre de l'image)?
shacard a écrit :Grubert a écrit :J'ai trouvé un cas similaire sur AVSforum:However, I really don't recommend using this PJ at dead centre as you get the worst ANSI contrast in this position and these models aren't blessed with the highest figure to start with. Manni01 actually measured this somewhere on the HD750 thread and I've had practical experience of the effect as at dead centre (to help when I used to zoom...although I did get better ): I found that at dead centre when there were end credits scrolling down the screen I could see a reverse 'ghost' image going the opposite way a little to one side of the screen. Moving my HD350 to level with the top of the screen and applying the appropriate amount of lens shift cured this issue and by inferance improved ANSI contrast as any bright parts of the image that 'ghost' over dark parts would raise the black levels in those parts. Unfortunately you do get the sharpest image at dead centre, so it is a compromise...enough lens shift to cure the ghosting, but not enough to noticably decrease the sharpness.
Tu es au zéro lens shift? (càd projo pile au centre de l'image)?
Merci pour cette recherche Grubert.
Malheureusement mon 750 est positionne au cente de l'ecran. J'essaierai de l'installer sur la petite table basse devant les sieges pour voir si en utilisant le lenshift ca a un impact.
Tu as le lien vers le post en question sur avs ?
A+
Grubert a écrit :Le lien était bien dans mon post (clique sur le "AVSforum" en bleu et souligné )
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