Optoma ZH451ST vs Optoma ZK431ST

Optoma ZH451ST is in stock.

	Optoma ZH451ST$1,698.98 · Amazon Buy	Optoma ZK431ST

Key differences
White light output
White light output	4,200 lm ISO	—
Native resolution
Native resolution	1080p (1920 × 1080)	—
Lowest input lag
Lowest input lag	8.4 msDerived	8.6 msDerived
HDR formats
HDR formats	HDR10, HLG	—
Fan noise
Fan noise	Normal 36 dB(A) · Eco 29 dB(A)	Normal 35 dB(A) · Eco 29 dB(A)
Best price
Best price	$1,698.98	—
Room fit80″100″120″150″
Distance to screen
Distance to screen	1.1 m	1.1 m
Picture
White light output
White light output	4,200 lm ISO	—
Claimed brightness (non-standard)
Claimed brightness (non-standard)	—	4,100 lm
Brightness uniformity
Brightness uniformity	75%	75%
Imaging technology
Imaging technology	DLP	DLP
Native resolution
Native resolution	1080p (1920 × 1080)	—
Native aspect
Native aspect	16:9Derived	16:9Derived
Addressable resolution
Addressable resolution	—	4K UHD (3840 × 2160)
Dynamic contrast
Dynamic contrast	2,000,000:1	2,000,000:1
Colour bit depth (per channel)
Colour bit depth (per channel)	10 bit	—
Gamma / EOTF presets
Gamma / EOTF presets	2.2, 2.4	2.2, 2.4
HDR formats
HDR formats	HDR10, HLG	—
Colour management (CMS)
Colour management (CMS)	6-axis	—
Picture certifications
Picture certifications	ISF, Filmmaker Mode	—
3D
3D	Yes	Yes
3D formats
3D formats	Side-by-side, Top-bottom, Frame sequential	Frame packing, Side-by-side, Top-bottom
3D glasses sync
3D glasses sync	DLP-Link	DLP-Link
Light source
Light source
Light source	Laser (phosphor)	Laser (phosphor)
Emitter
Emitter	Blue laser + phosphor	—
Light engine
Light engine	DuraCore	—
Light-source life
Light-source life	30,000 h	30,000 h eco
Light output control
Light output control	Steps	—
Constant brightness mode
Constant brightness mode	Yes	—
Cool-down time
Cool-down time	90 s	—
Optics
Throw ratio
Throw ratio	0.5:1	0.5:1
Image size
Image size	30–300 in	30–300 in
Projection offset
Projection offset	116%	114%
Zoom
Zoom	Digital	None
Focal length
Focal length	7.51 mm	7.51 mm
Aperture (f-number)
Aperture (f-number)	2.8	2.8
Focus
Focus	Manual	Manual
Autofocus
Autofocus	No	—
Vertical keystone
Vertical keystone	15°	15°
Horizontal keystone
Horizontal keystone	15°	15°
Corner correction
Corner correction	4-corner	4-corner
Grid warp
Grid warp	—	Yes
Motion & gaming
Input lag
Input lag	About 1080p: 60 Hz 16.7 ms · 120 Hz 8.4 ms · 4K UHD: 60 Hz 16.7 ms	1080p: 60 Hz 16.7 ms · 120 Hz 8.6 ms · 4K UHD: 60 Hz 16.7 ms
Inputs & control
HDMI inputs
HDMI inputs	2 × HDMI 2.0	2 × HDMI 2.0
Other video inputs
Other video inputs	VGA	—
Max input resolution
Max input resolution	4K UHD	4K UHD
Control ports
Control ports	RS-232, Wired IR, 12 V trigger	RS-232, 12 V trigger
PJLink
PJLink	Class 1	—
Control-system drivers
Control-system drivers	Crestron	—
Horizontal scan
Horizontal scan	15–135 kHz	15–150 kHz
Vertical scan
Vertical scan	24–120 Hz	24–240 Hz
Smart platform
Ethernet
Ethernet	Yes	Yes
Audio
Speaker power
Speaker power	15 W	15 W
Speakers
Speakers	1	1
Layout
Layout	Mono	—
Audio outputs
Audio outputs	—	3.5 mm
HDMI audio return
HDMI audio return	—	NoneDerived
Physical & installation
Dimensions (W × D × H)
Dimensions (W × D × H)	274 × 216 × 114 mm	274 × 216 × 109 mm
Weight
Weight	3,000 g	2,900 g
Orientations
Orientations	Portrait, 360°	360°
Ceiling mount
Ceiling mount	M4, 10 mm screws	M4, screws ≥ 10 mm
Ingress protection
Ingress protection	IP6X	—
Environment & power
Operating temperature
Operating temperature	0–40°C	0–40°C
Altitude
Altitude	2,500 m · high-altitude mode	3,048 m
Power draw
Power draw	Max 170 W	Max 178 W · Eco 125 W
Standby
Standby	Up to 0.5 W	Up to 0.5 W
Power supply
Power supply	External adapter	External adapter
Mains input
Mains input	100–240 V · 50/60 Hz	100–240 V · 50/60 Hz
DC input
DC input	—	19.5 V
Fan noise
Fan noise	Normal 36 dB(A) · Eco 29 dB(A)	Normal 35 dB(A) · Eco 29 dB(A)
Safety & support
Laser class
Laser class	Class 1	Class 1
Risk group
Risk group	RG2	RG2
Hazard distance
Hazard distance	1 m	1 m
FDA laser notice
FDA laser notice	—	Notice 57
Marks
Marks	FCC	FCC
Warranty
Warranty	—	5 yr
User manual
User manual	https://region-resource.optoma.com/products/documents/0NL94Q0vvVEJVe7dxQKlMzhtuURlT8FwUXNkLi8y.pdf	—
In the box
In the box
In the box	Power cord, Remote, Remote batteries, Quick start guide	Power cord, Remote, Remote batteries, Quick start guide
Remote
Remote	IR	—

Optoma ZH451ST$1,698.98 · Amazon

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Optoma ZK431ST