Optoma ZK431ST vs Optoma ZK451

Optoma ZK451 is in stock.

	Optoma ZK431ST	Optoma ZK451$1,599 · Amazon Buy

Key differences
White light output
White light output	—	4,500 lm ISO
Throw ratio
Throw ratio	0.5:1	1.4–2.24:1
HDR formats
HDR formats	—	HDR10, HLG
Fan noise
Fan noise	Normal 35 dB(A) · Eco 29 dB(A)	Max 35 dB(A) · Eco 29 dB(A)
Best price
Best price	—	$1,599
Room fit80″100″120″150″
Distance to screen
Distance to screen	1.1 m	3.1–5.0 m
Picture
White light output
White light output	—	4,500 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 aspect
Native aspect	16:9Derived	16:9Derived
Addressable resolution
Addressable resolution	4K UHD (3840 × 2160)	4K UHD (3840 × 2160)
Dynamic contrast
Dynamic contrast	2,000,000:1	2,000,000:1
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
3D
3D	Yes	Yes
3D formats
3D formats	Frame packing, Side-by-side, Top-bottom	Side-by-side, Top-bottom, Frame sequential
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-source life
Light-source life	30,000 h eco	30,000 h eco
Light output control
Light output control	—	Steps
Cool-down time
Cool-down time	—	90 s
Optics
Throw ratio
Throw ratio	0.5:1	1.4–2.24:1
Image size
Image size	30–300 in	30–300 in
Projection offset
Projection offset	114%	116%
Zoom
Zoom	None	Optical
Zoom ratio
Zoom ratio	—	1.6×Derived
Focal length
Focal length	7.51 mm	20.91–32.62 mm
Aperture (f-number)
Aperture (f-number)	2.8	2.5–3.26
Focus
Focus	Manual	Manual
Autofocus
Autofocus	—	No
Vertical keystone
Vertical keystone	15°	30°
Horizontal keystone
Horizontal keystone	15°	30°
Corner correction
Corner correction	4-corner	4-corner
Grid warp
Grid warp	Yes	Yes
Auto setup
Auto setup	—	Fit to screen, Obstacle avoidance
Motion & gaming
Input lag
Input lag	1080p: 60 Hz 16.7 ms · 120 Hz 8.6 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
Max input resolution
Max input resolution	4K UHD	4K UHD
Control ports
Control ports	RS-232, 12 V trigger	RS-232
Control-system drivers
Control-system drivers	—	Crestron, AMX
Horizontal scan
Horizontal scan	15–150 kHz	15–150 kHz
Vertical scan
Vertical scan	24–240 Hz	24–240 Hz
Smart platform
Ethernet
Ethernet	Yes	Yes
Audio
Speaker power
Speaker power	15 W	15 W
Speakers
Speakers	1	1
Audio outputs
Audio outputs	3.5 mm	3.5 mm
HDMI audio return
HDMI audio return	NoneDerived	NoneDerived
Physical & installation
Dimensions (W × D × H)
Dimensions (W × D × H)	274 × 216 × 109 mm	274 × 216 × 114 mm
Weight
Weight	2,900 g	2,900 g
Orientations
Orientations	360°	Table, Ceiling, Rear, Portrait, 360°
Ceiling mount
Ceiling mount	M4, screws ≥ 10 mm	M4, screws ≥ 10 mm
Dust filter
Dust filter	—	None
Ingress protection
Ingress protection	—	IP6X (light engine)
Sealed optical engine
Sealed optical engine	—	Yes
Environment & power
Operating temperature
Operating temperature	0–40°C	0–40°C
Altitude
Altitude	3,048 m	3,048 m
Power draw
Power draw	Max 178 W · Eco 125 W	Max 178 W · Eco 124 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 35 dB(A) · Eco 29 dB(A)	Max 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	—
FDA laser notice
FDA laser notice	Notice 57	Notice 57
Marks
Marks	FCC	FCC
Warranty
Warranty	5 yr	3 yr (light source 5 yr or 12,000 h)
User manual
User manual	—	https://region-resource.optoma.com/products/documents/LaU8Uwg9XFPmrLtSBvohDroL18wojvZr27JsfxCM.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

Optoma ZK431ST

Optoma ZK451$1,599 · Amazon

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