[ham]

I am being encouraged to mount my PJ behind the far wall from my screen. It'll wind up 32 ft from the screen itself, which I'm hoping to be a 116" dalite dropdown, poss HP.


I'd like a JVC PJ but they run out of throw for that size screen at about 29-30 ft, and I've been advised to get a tele adapter. The Navitar are supplementary lenses either 1.25 or 1.5. Since there is some light loss with zoom, it seems to me that if the 1.25 and 1.5 lens have the same light loss it's a no brainer to use the 1.5 and relax the PJ lens a bit, further conserving lumens. But no one seems to know the transmission of the 1.25 or the 1.5. Any info here?


Also are there any issues with distortion in the 1.25 vs the 1.5?


alternatively, can someone recommend a reasonably priced PJ with RS-1 real world lumens (I suppose the RS2 is too weak to support this distance) and no visible screen door at 12 ft that has a motorized long throw lens? I've had no luck--only the infocus 777, which I think has screen door from what I've read, and is 720p.

 

[Alan Gouger]

I own several Navitar lens and have used them quit a bit over the years. I require a long throw with my projectors firing through a port hole in the back of the room. Most HT projectors still use what I call presentation lens and throws which always happen to fall to short for my needs. To date only 3 chip DLP have offered lens throw selection.

I have never measured the light loss from using such a lens but to my eye it is not visible. These lens are first class and do not add any chroma aberration or focus issues of any sort. They are very high quality all glass lens.

First rule of thumb never uses any glass or add ons including filters but if the need calls for it these lens deliver. I do not think you will see any performance loss from using one.

 

[darinp2]



Quote:
Originally Posted by ham /forum/post/14178842


I am being encouraged to mount my PJ behind the far wall from my screen. It'll wind up 32 ft from the screen itself, which I'm hoping to be a 116" dalite dropdown, poss HP.


I'd like a JVC PJ but they run out of throw for that size screen at about 29-30 ft, and I've been advised to get a tele adapter.

Since you are within about 10% for throw, how about making the screen 10% wider?


And what is your reason for wanting to mount behind the back wall? Is it mostly for noise, because I think most people consider the RS1 to be pretty quiet, especially if it would be way behind you if you mounted it on the back wall.


--Darin

 

[ham]

It's a drop down screen, and I'm out of room at the top--ceiling is a truncated vault and that's the limit I can go.


Re the back wall, I'd prefer to do something different as well. The only alternative, which I also need to research, is a drop down ceiling mounted lift for the PJ--ceiling is 13 ft high, and it'd have to drop 6 ft. That would give me more placement options but also introduce another piece of motorized equipment. However, that could be the best solution, and would let me use an RS2.

 

[darinp2]



Quote:
Originally Posted by ham /forum/post/14180074


Re the back wall, I'd prefer to do something different as well. The only alternative, which I also need to research, is a drop down ceiling mounted lift for the PJ--ceiling is 13 ft high, and it'd have to drop 6 ft. That would give me more placement options but also introduce another piece of motorized equipment. However, that could be the best solution, and would let me use an RS2.

Just figured I would throw out the idea of using an equipment stand behind the viewers, with the projector on top shooting over people's heads. I don't know the room layout and not sure how that would work, or whether you've already thought of that.


--Darin

 

[ham]

I looked into putting an Auton TV lift in a credenza behind the sofa, but there is a pool table about 5 ft away--would run the risk of hitting the PJ. So the dropdown might be the best solution.

 

[noah katz]

Assuming you were going to get a 16:9 screen, another option might be to go with a wider AR, like 2:1 or 2.35:1, though there's additional complexity w/a VP needed to handle the AR adjustments.