Hi guys,

I was just wondering if placing the projection lens in a hole in the front of the box would work? This would work by just moving the lens in and out of that hole to focus...is there enough travel? My lens will be about 3m (10ft) from the wall i'm projecting to.

See the picture for a description.

Cheers

unless i am misunderstanding your question, this has been covered several times and for a while...people call it box-in-a-box design. tons of people use it.

yep...you're misunderstanding my question

what i meant was, the front of the box is flat. There is no box within a box, just a hole in the front where the triplet sits firmly in, and the only thing that moves is the triplet itself, in and out of the hole. no box, no threaded designs, no pvc pipes. Just a hole and the triplet.

So is it possible? Is there enough travel?

Cheers

let's say you need a minimun of 0.5cm so the triplet does not fall down. The LL standard triplet has 2cm of tubular housing you can move throw. This gives you 1,5cm adjust no more.

now let's say you want a maximun of 100" imagesize (so triplet goes at 36,8cm from the lcd and 8' throw) then if you move the triplet 1,5cm, so lcd is 38.3cm from triplet, this will give you 6.3' trhow and 76" diagonal image.

So your range would be 76" to 100" image at 6.3' to 8' throw. (but it depends on where you want the average trhow, I just took the 100" as refernce)

is it what you were asking for?