Optoma ZK750 or Christie 4K7-HS - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 2 Old 07-30-2019, 06:59 PM - Thread Starter
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Optoma ZK750 or Christie 4K7-HS

Would either of these projectors work in a home theater setting? Has anyone seen a demo of either projector?

Optoma ZK750:

Ultra Bright 4K UHD Laser Interchangeable Lens Projector.

  • Crystal clear 4K UHD image with 7,500 lumens
  • MultiColor Laser technology provides uncompromised brightness with richer colors
  • Integrated image warping and blending, and 3D playback ready
  • HDR10 with wide color gamut support
  • DuraCore technology: maintenance-free laser light source with IP6X-certified optical engine
  • Multiple interchangeable optical lens options 24/7, 360° and portrait mode operation
  • Class-leading chassis – compact, light and quiet

7,500 lumens 4K UHD professional installation projector
Embrace professional installation 4K UHD projection with the bright, 7,500 lumens Optoma ProScene ZK750. MultiColor Laser (MCL) light source technology employs blue and red laser diodes to deliver rich colors and outstanding contrast while maintaining high brightness, making it ideal for large venues, auditoriums, museums, houses of worship and digital signage.
HDR10 and DCI-P3 wide color gamut ensure 100-percent coverage of REC.709 color space with accurate colors for stunning visuals. DuraCore technology ensures reliable, virtually maintenance-free operation with an IP6X-certified optical engine and up to 30,000 hours (Eco) of laser light source life, providing lower total cost of ownership.
A variety of premium lens options, motorized lens-shift, zoom and focus with 360° and portrait operation ensure installation flexibility for virtually all needs. HDMI 2.0, DisplayPort 1.2a, HDBaseT and 3G-SDI inputs provide connectivity to highquality 4K HDR digital sources while LAN and RS232 enable control via Crestron, Extron, AMX or Telnet.

Christie 4K7-HS

General Information: The Christie® 4K7-HS combines the cost-savings of 1DLP® technology, the long operational life of laser and the image quality of 4K UHD resolution. The result is a high-performance 7,000 lumen, 4K UHD, HDR10 compatible laser projector that won't blow your budget.
What makes the 4K7-HS outperform the competition is the enhanced color performance thanks to the patented Christie BoldColor Technology. Colors appear natural and with the added fidelity of 4K UHD resolution, visuals are lifelike and clearer than ever.
The 4K7-HS features built-in Christie Twist™ for fast and easy multi-projector setups. For even more flexibility, the 4K7-HS has two expandable option card slots which can accommodate cards such as the Christie Terra input card; 3G SDI input cards; and HDBaseT input cards. Plus, with HDMI 2.0, Display Port 1.2 Inputs, you can feed the projector 4K60Hz content over a single HDMI or Display Port cable for simplified setup and cable routing.

Key features
  • 1DLP 4K UHD resolution - Benefit from high fidelity visuals at an affordable price
  • Christie BoldColor Technology - Enhanced color performance and saturation over standard laser phosphor projection
  • Compact and light - Small form factor and weighs less than 80 lbs. for easy shipping, lifting and installation
  • Long-life laser light source - Up to 20,000 hours of virtually maintenance-free operation
  • Blend and warp - Compatible with Christie Twist for quicker and easier multi-projector setups
  • Fully omnidirectional - Unrestricted design and installation flexibility
  • Expandable OPS slot - Customize the performance and flexibility with two expandable option card slots
  • Comprehensive connectivity - Full connectivity for popular formats including 3GSDI (optional) for added redundancies
  • Christie Virtual Remote 1DLP - Gives you wireless control from any smartphone or tablet
  • Advanced electronics - Firmware updates take only minutes

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post #2 of 2 Old 08-01-2019, 02:37 AM
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Originally Posted by flyguyjake
Hi Arrow,

What are your thoughts on these 2 projectors for home theater use? Given their 7K lumen output do you think this could calibrated to achieve really bright HDR performance?

The Optoma has (2) lasers, the Christie has a single laser.


In order to achieve good HIGH Dynamic Range (HDR) performance a HIGH Dynamic Range with respect to luminance is required. Makes sense right?

It is a misconception that all you need is a lot of light output to achieve good HDR performance. The peak light output influences the peak white level. This is only one half of the equation.

The peak luminance dynamic range is influenced by the ON/OFF contrast, which is the ratio between the peak white level luminance versus the corresponding black level luminance. Furthermore, the luminance dynamic range with respect to video content is governed by the contrast ratio performance throughout the range 0% Average Display Luminance (ADL) which is the ON/OFF contrast to 20% ADL, wherein typically over 90% of video content resides; with the remaining circa 10% of video content residing within the range 20% ADL - 50% ADL (which is the ANSI contrast ratio).

Therefore for good HDR performance there needs to be good performance with respect to the contrast ratio throughout the range 0% - 20% ADL, but most importantly 0% - 5% ADL, and especially 0% - 1% ADL.

Wherein, the fact of the matter is that the TI single chip 4M pixel shift resolution (it's not native 4K) 0.67" DLP chipset that features within these projectors has very low luminance dynamic range and poor contrast performance. The native ON/OFF contrast performance of the chipset measures only a paltry circa 500:1 - 800:1. The Christie 4K7-HS uses a lens iris to increase this, but only to circa 3,000:1. Wherein, the fact of the matter is that both of these projectors have poor contrast performance throughout both of the ranges 0% - 1% ADL and 0% - 5% ADL; and hence LOW luminance dynamic range. Consequently, unfortunately NEITHER of these two projectors will achieve good HDR performance.

You will achieve a bright image, yes, however, lots of light output is not all that is required to achieve good HDR performance, for the aforementioned reason. You need high white level luminance in combination with a low black floor. The both of these projectors will perform better with high ADL content though and will produce nice bright images. Just don't expect great HDR performance or blacks that look black with lower ADL content

Last edited by ARROW-AV; 08-02-2019 at 11:50 PM.
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