I have 2 vga devices i need to connect so i bought a moread hdmi to vga adapter. but i'm getting a no signal when using the adapter. any suggestions?

Most HDMI to VGA adapters are one way only. You'll need to look for VGA to HDMI adapter instead. With a quick search I found "Vention VGA to HDMI". Also linked below. https://www.amazon.com/Monitor-Connector-VENTION-Adapter-Computer/dp/B08GZ159FJ?th=1

Is there a source that compares the models of this series? The chart you included above has very little information.

you can check Epson's website. Just know you get what you pay for and don't be cheap when buying a projector.

What are the throw ratio and zoom ratio for this projector?

Throw Ratio Range: 1.04 – 1.26 ------------------------------------- What's In The Box: PowerLite 1781W projector power cable, computer cable (VGA) USB cable projector remote control with batteries soft carrying case user manual CD EasyMP® software CD Quick Setup Sheet registration card Specifications Projector: Projection System: RGB liquid crystal shutter projection system Projection Method: Front/rear ceiling mount, Front/rear desktop Driving Method: Poly-silicon TFT Active Matrix Pixel Number: 1,024,000 dots (1280 x 800) x 3 Color Brightness - Color Light Output: 3,200 lumens White Brightness - White Light Output: 3,200 lumens Aspect Ratio: 16:10 Resolution: 1280 x 800 (WXGA) Resize: 640 x 480 (VGA), 800 x 600 (SVGA), 1024 x 768 (XGA), 1280 x 1024 (SXGA), 1400 x 1050 (SXGA+), 1440 x 900 (WXGA+), 1600 x 1200 (UXGA), 1680 x 1050 (WSXGA+) Lamp Type: 214 W UHE Lamp Life: 7,000 hours (ECO Mode), 4,000 hours (Normal Mode) Throw Ratio Range: 1.04 – 1.26 Size - projected distance: 30" – 300" (2.2 – 26.8 ft) USB Plug 'n Play: Projector is compatible with PC and Mac® computers Contrast Ratio: Up to 10,000:1 Color Reproduction: Up to 1.07 billion colors General: Operating Temperature: 41 ° to 95 °F (5 ° to 35 °C) Weight: 4.0 lb Projection Lens: Type: Optical Zoom (Manual)/ Focus (Powered) F-number: 1.58 – 1.70 Focal Length: 13.52 – 16.22 mm Zoom Ratio: Optical zoom 1.0 – 1.2 Projector Details: Display Performance: NTSC: 480 line PAL: 576 line (depends on observation of the multi-burst pattern) Input Signal: NTSC/NTSC4.43/PAL/M-PAL/N-PAL/PAL60/SECAM SDTV/HDTV Interfaces: 1x HDMI (Supports MHL® connectivity) Computer/component video: 1x D-sub 15 pin Composite video: 1x RCA USB Type A: 1x PC-free USB and other USB Type B: 1x USB Plug ‘n Play Fan Noise: 39 dB (Normal Mode), 30 dB (ECO Mode) Audio Output: 1 W mono speaker Remote Control: Features: Power, Source Search Selection, Computer, Video, A/V Mute, Freeze, User ID, Auto, Aspect, Color Mode, NUM, Page Up and Down, E-zoom, Volume, Help, Menu, Enter, ESC and Pointer functions Operating Distance: 19.7 ft Operating Angle: Right/left: Front: ± 60 degrees; rear: ± 30 degrees Power: Power Supply Voltage: 100 – 240 V ±10%, 50/60 Hz Power Consumption: 309 W (Normal Mode), 217 W (ECO Mode)

Brand Name	Epson
Item Weight	4 pounds
Product Dimensions	11.5 x 8.4 x 2.1 inches
Item model number	PowerLite 1781W
Batteries	1 Lithium Ion batteries required. (included)
Is Discontinued By Manufacturer	No
Color Name	Black
Special Features	Portable, Lightweight
Item display height	6 inches

PowerLite 1781W WXGA, 3,200 lumens color brightness (color light output), 3,200 lumens white brightness wireless 3LCD Portable Projector , Black

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