Joined
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7,125 Posts
Here are my reviews of the following SONY and JVC projectors:
• SONY 295/270ES
• SONY 885/760ES
• JVC RS540/X7900
• JVC RS4500/Z1
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JVC RS4100 / NZ9 (#1):
High Laser, Maximum Zoom, Iris 0
JVC RS2100 / NZ7 (#2):
High Laser, Maximum Zoom, Iris 0
JVC RS2100 / NZ7 (#1):
High Laser, Maximum Zoom, Iris 0
THE IMPORTANCE OF FULL RANGE CONTRAST MEASUREMENTS
ON/OFF contrast and ANSI contrast by no means tell you the whole picture as far as contrast and black levels performance is concerned. Why? Because neither ON/OFF nor ANSI in themselves directly describe what is the contrast and black levels performance of actual video content.
ON/OFF contrast and ANSI contrast are the two extreme ends of the contrast range that applies to video content. The ON/OFF Contrast only gives you the black level on a completely black picture (full field black). Similarly, the ANSI Contrast only gives you the black level at what is typically the extreme upper limit of video content brightness. Where typically 99% of video content falls in-between these.
Consequently, in order to properly evaluate and understand what is the comparative contrast and associated black levels performances regarding different video display devices, including projectors, we need to take measurements with respect to the whole range of ADL (Average Display Luminance), being defined as the average on-screen brightness after gamma correction.
ON/OFF contrast corresponds to an ADL of 0%; and ANSI contrast corresponds to 50% ADL.
The average ADL of movies is circa 8% – 9.6%. About 11% of video content resides under 1% ADL; 50% within the range 0% - 5% ADL; and 90% within the range 0% - 20% ADL, making this range to be the most important.
Here is an illustrative example; where this particular image measures 5.9% ADL:
For further details regarding the importance of full range contrast measurements and the absolutely superb ADL contrast study carried out by Florian & Anna of PROJECTION DREAMS ( @Soulnight ) see: Brightness of movies (ADL) and contrast measurements
😉
• SONY 295/270ES
• SONY 885/760ES
• JVC RS540/X7900
• JVC RS4500/Z1
-------------------------------------------------------------------------------------------------------
JVC RS4100 / NZ9 (#1):
High Laser, Maximum Zoom, Iris 0

JVC RS2100 / NZ7 (#2):
High Laser, Maximum Zoom, Iris 0

JVC RS2100 / NZ7 (#1):
High Laser, Maximum Zoom, Iris 0

THE IMPORTANCE OF FULL RANGE CONTRAST MEASUREMENTS
ON/OFF contrast and ANSI contrast by no means tell you the whole picture as far as contrast and black levels performance is concerned. Why? Because neither ON/OFF nor ANSI in themselves directly describe what is the contrast and black levels performance of actual video content.
ON/OFF contrast and ANSI contrast are the two extreme ends of the contrast range that applies to video content. The ON/OFF Contrast only gives you the black level on a completely black picture (full field black). Similarly, the ANSI Contrast only gives you the black level at what is typically the extreme upper limit of video content brightness. Where typically 99% of video content falls in-between these.
Consequently, in order to properly evaluate and understand what is the comparative contrast and associated black levels performances regarding different video display devices, including projectors, we need to take measurements with respect to the whole range of ADL (Average Display Luminance), being defined as the average on-screen brightness after gamma correction.
ON/OFF contrast corresponds to an ADL of 0%; and ANSI contrast corresponds to 50% ADL.
The average ADL of movies is circa 8% – 9.6%. About 11% of video content resides under 1% ADL; 50% within the range 0% - 5% ADL; and 90% within the range 0% - 20% ADL, making this range to be the most important.
Here is an illustrative example; where this particular image measures 5.9% ADL:

For further details regarding the importance of full range contrast measurements and the absolutely superb ADL contrast study carried out by Florian & Anna of PROJECTION DREAMS ( @Soulnight ) see: Brightness of movies (ADL) and contrast measurements
😉