Panamorph DCR-J1 and DCR-S1

[randman]

What AT screen is a true " 1.2 gain "? I do see an increase in pixel density with my DCR lens. That was more subtle though than the increase in brightness.
Dimensions and settings for aspect ratios are spelled out here pretty well - Panamorph 4K/8K Cinema Format Home Theater Projector Lenses

Screen Innovations Slate 1.2 ALR (at least the specs say it's got a 1.2 gain). 

[randman]

I'll be mounting my JVC DLA-RS1000 this week (finally getting HT done after moving houses). 

I'm considering mounting the projector so that its lens will be around 8" from the back of the rear wall (I'd like to have some space to account for front exhaust). 

Just in case I decide to get the DCR-J1, I'd like to make sure that there is sufficient space between the projector and the rear wall and to be able to easily mount the lens without having to move the projector. 

Some questions:

1. How much depth does the DCR-J1 add to the front of the JVC projector?

2. In addition to the depth of the lens assembly, I suppose I need a little more free space so that I can mount the lens onto the projector without having to move an already mounted projector. So, does anyone have any recommendations on how much space to leave between the projector lens and back of rear wall to easily mount the lens?

The projector is so heavy that I really don't want to move it once it's mounted!

[AVSCraig]

I'll be mounting my JVC DLA-RS1000 this week (finally getting HT done after moving houses).

I'm considering mounting the projector so that its lens will be around 8" from the back of the rear wall (I'd like to have some space to account for front exhaust).

Just in case I decide to get the DCR-J1, I'd like to make sure that there is sufficient space between the projector and the rear wall and to be able to easily mount the lens without having to move the projector.

Some questions:

1. How much depth does the DCR-J1 add to the front of the JVC projector?

2. In addition to the depth of the lens assembly, I suppose I need a little more free space so that I can mount the lens onto the projector without having to move an already mounted projector. So, does anyone have any recommendations on how much space to leave between the projector lens and back of rear wall to easily mount the lens?

The projector is so heavy that I really don't want to move it once it's mounted!

Is your projector in a hush box or somewhere that you can't just mount the lens to the front of the projector? 

[DLCPhoto]

The DCR-J1 just mounts to the front of the Projector, so the distance from the back isn't relevant. The 1.4x throw distance they recommend is from the front of the Projector's lens, not the DCR, so the added depth of the DCR-J1 doesn't need to be considered in this calculation.

I added the regular DCR to my NX7, which requires a plate to be attached to the projector's bottom area, and I was able to do this without removing the NX7 from the ceiling mount. The DCR-J1 is even simpler in this regard.

[randman]

My projector will be in a storage room behind the Home Theater. There is a hole between the two rooms. Here's a picture (projector not mounted yet):

Panamorph DCR-J1 and DCR-S1

I'll be putting a framed glass (with 6mm glass) from hometheatreglass.com to keep fan noise out of the HT room.

So, I was thinking of having 8" between the projector lens and the rear wall. Would 6" to 8" between the lens and the rear wall be sufficient room to be able to easily mount the lens  without having to move the projector?


Edit: my screen width is 123" and the storage room is 19' from screen, so my throw is 1.9 or so. I shouldn't have to worry about barrel distortion at this distance. I'm more concerned about havingenough space to physically mount the lens into the projector since I really don't want to mess with moving the projector in the future, given how heavy it is.