| ktulu909 |
Between last night and today,If done alot of reading,but I still need a question answered.I dont know how far back most of you are setting up your projecters.
THis is my room.And I need a projecter.I have a panel (not bad for a starter its a Infocus powerveiw 950),but I need a projecter still.The target wall is 10'wide X8'tall and the only location in the room is 16.5' away from that wall.I dont know if a OHP will suffice or is even adjustable enough to be that far back,as I dont know **** about OHP's except to get one that is 4,000+lumens.
Any one that can jump in here and throw me in the right direction would be GREATLY appreciated.
Thanks in advance,
Ktulu909 |
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| Hezz |
ktulu909,
At 16.5 feet away the average overhead projector will through too big of an image for your wall. You will need to find a way to put the projector closer to the wall or else build or modify a OHP with a longer focal length lens.
Hezz |
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| vudutek |
yup, i'm in about the same situation. my pj is going to be about 15' from the wall/ screen, and i'm only looking for about an 8' diagonal.
based upon what i've read, and doing the math for the optics i have, my current setup will throw an approx 14' image on the wall.
i'm assuming i'm going to need to use a plano-convex in front of my triplet (317mm FL) to reduce the size. is this correct? |
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| ktulu909 |
What about any of the MK plans at diylabs,would any of those suffice.I really dont know enough about optics to calculate a focal range of a lens,but Id like to hear from anyone who might be set up this far away from the wall.This is all pretty new to me but I think im getting a grip on some of it.For a situation like this what type of lenses am I looking at?
Thanks,
Ktulu909 |
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| ktulu909 |
| Does anyone have a setup from this far away working decent?Also,how long are my posts moderated? |
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| ktulu909 |
| One more question.about how far do I need to have the OHP for a nice 8' X 6' screen?? |
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| edrnrman |
| with the diylabs setup i had about 10.5 ft is a pretty big screen about 72 in diagonal so the father back the bigger it will be i did notice a big diffrence with the triplett lens from diy versus ohp lens could be futher back from screen with ohp lens than the triplett. i would say my first lens setup i was probably 12 to 13 ft back for the same size picture. but was nowhere near as pretty a picture as the triplett lens gives. |
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