I don't know if Dukane has a different manual than JVC or I'm just not getting it. In the JVC manual, it shows two tables -- one for 4:3 screens and the other for 16:9 screens. I have a 16:9 screen, so do I use that table or the 4:3 table?
Also, the tables list projection distance vs. min and max diagonal lengths of the screen. There is no width or height although it can be derived, I guess, from the diagonal lengths. Also, the projection distances jump in 3 to 4 foot increments on the tables -- not enough granularity for my small theater room.
Anyways, if anyone knows the formula for calculating what I asked for -- I'd be mighty gratelful. An example calculation (using my numbers) would even be better..
How much closer is the throw distance using the ISCO -- 33% shorter?
JVC's 16:9 tables are likely based on the assumption that you're using a 1365x768 pixel area. In other words, for the same throw distance, the 16:9 screen width will be the same as a 4:3; but the height of the 4:3 screen will be 33% larger.
The ISCO, on the other hand, will leave the height the same, but increase the width by 33%.
So to use JVC's tables properly in your situation, ignore the 16:9 table completely. Instead, use the 4:3 table to compute the optimum throw distances for a 65" x 49" screen.
With an ISCO I, you are pretty much limited to max throw. I am at 18 feet for my 60" x 107" screen. I understand that you can use more of the zoom with the ISCO II. You may get more pincushion as you move closer to the screen.
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