Optoma ZH451 vs Optoma ZK450

Optoma ZK450 is better for gaming.

	Optoma ZH451	Optoma ZK450MSRP $5,749

Key differences
White light output
White light output	4,600 lm ISO	—
Native resolution
Native resolution	1080p (1920 × 1080)	—
Lowest input lag
Lowest input lag	8.6 msDerived	4.4 msDerived
HDR formats
HDR formats	—	HDR10, HLG
Fan noise
Fan noise	Max 31 dB(A) · Eco 29 dB(A)	Max 35 dB(A) · Normal 28 dB(A)
MSRP
MSRP	—	$5,749
Room fit80″100″120″150″
Distance to screen
Distance to screen	3.1–5.0 m	3.1–5.0 m
Picture
White light output
White light output	4,600 lm ISO	—
Claimed brightness (non-standard)
Claimed brightness (non-standard)	—	4,200 lm
Brightness uniformity
Brightness uniformity	75%	80%
Imaging technology
Imaging technology	DLP	DLP
Chip / panel diagonal
Chip / panel diagonal	—	0.65 in
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	3,000,000:1	300,000:1
Colour bit depth (per channel)
Colour bit depth (per channel)	10 bit	—
Gamma / EOTF presets
Gamma / EOTF presets	—	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)
Light-source life
Light-source life	30,000 h	Up to 30,000 h max
Light output control
Light output control	Steps	Steps
Cool-down time
Cool-down time	—	90 s
Optics
Throw ratio
Throw ratio	1.4–2.24:1	1.4–2.24:1
Image size
Image size	30–300 in	26–303 in
Projection offset
Projection offset	116%	116%
Zoom
Zoom	Optical	Optical
Zoom ratio
Zoom ratio	1.6×Derived	1.6×Derived
Focal length
Focal length	20.91–32.62 mm	20.91–32.62 mm
Aperture (f-number)
Aperture (f-number)	2.5–3.26	2.5–3.26
Focus
Focus	Manual	Manual
Autofocus
Autofocus	No	No
Vertical keystone
Vertical keystone	30°	30°
Horizontal keystone
Horizontal keystone	30°	30°
Corner correction
Corner correction	4-corner	4-corner
Motion & gaming
Max input refresh
Max input refresh	—	1080p: 240 Hz · 4K UHD: 60 Hz
Input lag
Input lag	1080p: 60 Hz 17 ms · 120 Hz 8.6 ms · 4K UHD: 60 Hz 16.9 ms	1080p: 60 Hz 16 ms · 120 Hz 8 ms · 240 Hz 4.4 ms · 4K UHD: 60 Hz 16 ms
Inputs & control
HDMI inputs
HDMI inputs	2 × HDMI 2.0	HDMI 2.0 · HDMI 2.0 (eARC)
Other video inputs
Other video inputs	VGA	—
Max input resolution
Max input resolution	4K UHD	4K UHD
Audio inputs
Audio inputs	3.5 mm	—
Control ports
Control ports	RS-232, 12 V trigger	RS-232
PJLink
PJLink	Class 2	—
Control-system drivers
Control-system drivers	Crestron, AMX	Crestron, AMX
Horizontal scan
Horizontal scan	15–135 kHz	15–140 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	3.5 mm, HDMI eARC
HDMI audio return
HDMI audio return	NoneDerived	eARCDerived
Physical & installation
Dimensions (W × D × H)
Dimensions (W × D × H)	274 × 216 × 114 mm	274 × 216 × 114 mm
Weight
Weight	2,998 g	3,000 g
Orientations
Orientations	Table, Ceiling, Rear, Portrait, 360°	Table, Ceiling, Rear, Portrait, 360°
Ceiling mount
Ceiling mount	M4, screws ≥ 10 mm	M4, screws ≥ 10 mm
Ingress protection
Ingress protection	IP6X	IP6X
Environment & power
Operating temperature
Operating temperature	0–40°C	0–40°C
Operating humidity
Operating humidity	0–80%RH	—
Altitude
Altitude	2,500 m · high-altitude mode	—
Power draw
Power draw	Max 170 W · Eco 120 W	Max 185 W · Eco 126 W
Standby
Standby	Up to 0.5 W	Up to 0.5 W
Networked standby
Networked standby	—	Up to 2 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
Fan noise
Fan noise	Max 31 dB(A) · Eco 29 dB(A)	Max 35 dB(A) · Normal 28 dB(A)
Safety & support
Laser class
Laser class	Class 1	Class 1
Risk group
Risk group	RG2	RG2
FDA laser notice
FDA laser notice	—	Notice 57
Marks
Marks	FCC	FCC
Warranty
Warranty	—	1 yr (light source 5 yr or 12,000 h)
User manual
User manual	https://region-resource.optoma.com/products/documents/mpTwkm9mUWvfsgMhppFmV04EqeoeeRYWmvKy7tBF.pdf	https://region-resource.optoma.com/products/import/Documents/cbd58627-8cc5-43de-9633-fa24cd20bd45.pdf
In the box
In the box
In the box	Power cord, Remote, Remote batteries, User manual	Power cord, Power adapter, Remote, Remote batteries, Quick start guide, User manual