I am looking to get the HD1000U and pair it with the PMS or NPL mountdirect mounts. I am in the process of designing the HT room and had a quick question on the zoom aspect to make sure I got it right.

I have a 85" ceiling. Assuming a 3.5" drop with the PMS, using the Mits calculator suggests that I can get a 100" diag screen (bottom being 23.6" from the floor and top being 72.6" from the floor). It also tells me that I can place the projector anywhere from 12' to 14.5' from the screen. Since I am still in the design phase and I can have some electrical outlets put in on the ceiling as well have my HDMI and component video lines run through right now and have some additional reinforcement in that area to hang the projector from the ceiling, I was going to choose 13' from the screen as the placement for my projector.

My question, in a longwinded manner, is whether the bottom and top of the projection on the screen will be the same irrespective of where I place the projector in the 12-14.5' range as long as I adjust the zoom to have the same diagonal? At 13', I'd need a zoom of 1.11X to get a 100" diag. At 12', I'd need a zoom of 1.20X to get the same 100" diag. Will they both project at the same spot on the wall?

Thanks much for your help in explaining this concept.

Will they both project at the same spot on the wall?Yes.

Image offset is a constant per centage of screen height. It matters little how you get there.

Be aware that the best PQ is obtained when using the minimum amount of zoom (smallest image); the contrast ratio is about 17% better than at full zoom and the focus will be sharpest.

The price is that you will lose about 60% of the brightness at minimum zoom, which you have to factor into your image brightness calculations.

Yes.

Image offset is a constant per centage of screen height. It matters little how you get there.

Be aware that the best PQ is obtained when using the minimum amount of zoom (smallest image); the contrast ratio is about 17% better than at full zoom and the focus will be sharpest.

The price is that you will lose about 60% of the brightness at minimum zoom, which you have to factor into your image brightness calculations.


While technically true I have found the effect of zoom on PQ to be minimal with the exception of brightness ( I have the Mits and have experimented).

I would not hesitate to use zoom with this PJ.