JVC RS4500 (native 4K laser projector)

[AVSCraig]

Forgive me if this has already been discussed, but why don't the laser projectors use a dynamic iris?  I understand that dynamic laser is nice, but seems like that could be combined with DI for increased contrast ratio in some situations.

You would have to ask the people that engineer these projectors. Maybe I'll ask Rod Sterling of JVC next time I see him. 

[stanger89]

Forgive me if this has already been discussed, but why don't the laser projectors use a dynamic iris?  I understand that dynamic laser is nice, but seems like that could be combined with DI for increased contrast ratio in some situations.

Actually a DI would not be that big of a deal, but what would be nice is to have a manual iris, so you had the option of running with more light output from the laser, but toned down with a manual iris (like the RS640's have) that dramatically increased native contrast.

[Pultzar]

Actually a DI would not be that big of a deal, but what would be nice is to have a manual iris, so you had the option of running with more light output from the laser, but toned down with a manual iris (like the RS640's have) that dramatically increased native contrast.

I thought this was already the case?

[AVSCraig]

Actually a DI would not be that big of a deal, but what would be nice is to have a manual iris, so you had the option of running with more light output from the laser, but toned down with a manual iris (like the RS640's have) that dramatically increased native contrast.

It has a manual iris.

[AVSCraig]

A few screenshots from " Baby Driver " on 4K Blu-ray -

[AVSCraig]

[AVSMike]

Actually a DI would not be that big of a deal, but what would be nice is to have a manual iris, so you had the option of running with more light output from the laser, but toned down with a manual iris (like the RS640's have) that dramatically increased native contrast.

Unlike the Sony laser projectors, the 4500 does have a manual iris. That is why I run my 4500 with laser power on medium power with iris closed down. That way I get 23,000:1 native on my 4500. Then add the dynamic dimming and I get good black levels and contrast.

[AVSCraig]

" Get Out " on 4K Blu-ray. Good movie, great looking disc !

[Dylan Seeger]

Unlike the Sony laser projectors, the 4500 does have a manual iris. That is why I run my 4500 with laser power on medium power with iris closed down. That way I get 23,000:1 native on my 4500. Then add the dynamic dimming and I get good black levels and contrast.

That is very respectable performance. Definitely more contrast than the 5000ES. I'm sure it looks great!

[woofer]

I am very soon to join the Z1/RS4500 owners club..       Cancelled my JVC 20LTD...hopefully my  the Z1 gets shipped out next week..
I also have to get the Chief mount plate and modify ( beef up ) my existing wall mount...  Hope its all worth it...

[Madfloyd]

It will be! You will love it.

[AVSMike]

I am very soon to join the Z1/RS4500 owners club..       Cancelled my JVC 20LTD...hopefully my  the Z1 gets shipped out next week..
I also have to get the Chief mount plate and modify ( beef up ) my existing wall mount...  Hope its all worth it...

Chief does not make a mounting plate that fits the regular line of RPA or RPMA mounts. The custom plate that Chief makes for the RS4500, fits a large heavy duty mount. I have put this information in this thread earlier, but here it is again.Chief VCM105J Adjustabilty of this mount is excellent.
 Would be fine with using this mount with all of my projectors,
 if plates were available.

[Dylan Seeger]

That mount looks beastly!

[woofer]

Chief does not make a mounting plate that fits the regular line of RPA or RPMA mounts. The custom plate that Chief makes for the RS4500, fits a large heavy duty mount. I have put this information in this thread earlier, but here it is again.Chief VCM105J Adjustabilty of this mount is excellent.
 Would be fine with using this mount with all of my projectors,
 if plates were available.

This is the one available to me here in Aus..

[AVSMike]

That mount looks beastly!

It is and it matches the projector.