Originally Posted by joef
Would something like the Epson G7905U make more sense? I see it supports different lenses that I could potentially use to push up the fl into the 30 range if necessary while still having a pretty good screen size for our seating area. I just don't have a sense of how many fl I really need. My kid is young so the earlier I can start movies the better re: his bedtime, although I guess that changes pretty quickly...
The 24-30' throw is pretty fixed; that's the range I have to work with here. The area between the screen and projector is pretty much wide open so there is some flexibility in terms of viewing distances. The only other option would be to keep the projector on a cart or something so it could be closer to the screen; I was just hoping to be able to leave it in place more or less permanently...the more work I have to do to use it, the less it will get used.
Thanks for the insights re: the 5040. I wasn't sure I was using the calculator properly but your numbers more or less matched up with what I was plugging in so I think I'm a bit more confident playing around with it now.
I still don't have a frame of reference to figure out what the brightness will be and whether I'd be satisfied. The 5040 seems like a great little machine, I'm just nervous I won't be happy with the output. I'm thinking about getting a light meter so I can get a sense of what the ambient light measures at various times/conditions.
I have one more question...I'd love to be able to watch football on Sundays out in the courtyard...pipe dream? Or can something like retractable sun shades potentially make it feasible?
Well, the foot lambert is a luminance measurement and simplistically, it's a product of the screen and projector combination. So some target bench marks for you would be:
Commercial theaters - approximately 12-16 fL.
A plasma screen TV - approximately 30-40 fL.
LCD TV's - approximately 70-100 fL.
So with some ambient light you're going to want to be in at least the 30-40fL range.
What I can tell you are generalizations as I don't really know what the actual environment really is and you've said two different things; you won't use it until the sun goes down but you also want to watch Sunday football with ambient light.
If you go for the higher fL for daytime/ambient light, then it maybe too bright for night viewing. You could use a filter to reduce the output however.
In general, projectors and sunshine/ambient light don't mix too well. There are special screen materials that can help with the ambient light and combined with high lumem output projectors can over come some of the issues. Expect to pay a few thousand dollars for the best screens the size you're after with the properties you need for ambient light rejection. You can DIY for less money but the results may not be as good.
With your budget, you could go for either Epson and be ok based on the appropriate screen size for the brightness level you're after with some ambient light. And then maybe you buy a 75"-85" TV to wheel out for football if the sun is shining.
Edit: Different lenses don't "push up the fl".