Originally Posted by Th601
Noob question. On the webinar for the new line of JVC projectors it was stated that 50fL is the target for brightness and HDR. The screen I will be getting is rated at 1.3 and is 130” diagonal CinemaScope. On VideoCalc app it says my fL would be 58fL. I’ve debated getting a lens until I saw where you said Kris had to dial it back. Are there any other advantages in getting the lens?
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So many factors to bring into play there. I assume you’re target projector is the N7, as that has a specified 1,900 lumens?
- it will only deliver those lumens at minimum throw, any greater throw distance and the lumens will reduce.
- It will only deliver those lumens uncalibrated. I’m not sure how much the new line lose through calibration, but I’d factor in 10%.
- it will only deliver those lumens in first use. As the bulb ages, particularly as you’ll be running on high lamp to hit those numbers, the output will drop. Again, I don’t know how the new units are holding up in that regard, but I’d expect to lose 10-15% in the first few hundred hours.
- Are you sure you’re screen delivers a 1.3 gain? Many manufacturers quote a figure higher than the materials achieve in reality.
Long and short of it, you are likely to be well under 50FtL when you eventually physically measure it. The DCR lens will likely give you a large enough light boost to negate all of those factors.
Also one overriding point on a JVC projector, is having more light than you need is actually a very good thing. It allows you to clamp down the manual iris further, increasing your on/off contrast for the same target light level.