Can i use this to convert a 720p hdmi to 1080i sdi?

Yes you can. Mini Converter UpDownCross HD has the ability to convert any SD or HD video format with up, down, or cross conversion via SDI and HDMI. See page 83 on Blackmagic Converters Manual. https://www.blackmagicdesign.com/manuals/Converters/Blackmagic_Converters_Manual.pdf

The output matches the monitor; which monitor? i will input a laptop hdmi out to 2 different switchers; 1 via hdmi 1 via sdi.

"Output supports EDID of the monitor". https://en.wikipedia.org/wiki/Extended_Display_Identification_Data This simply means that the converter does not output a fixed format via HDMI, rather it will communicate with the connected display to handshake on what resolution the monitor prefers. If your outputs are going direct to switchers and not to a display/TV, then this should not affect you and converter will simply output what you set it up to do.

Will this converter let me use my iphone camera or apple tablet camera into atem mini switcher?

Im not sure because the mini switcher allows you to switch video outputs during streaming. The UpDownCross use one signal and let you distribute that signal through the sdi out and hdmi out..

Does this device come with a power supply?

the one i ordered through here did

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Mini Converter UpDownCross HD

Product ID: 70737398

Details

Brand
Blackmagic
Maximum Supply Voltage
36 Volts (DC)
Minimum Supply Voltage
6 Volts
Mounting Type
Handmontage
Number of Pins
125

⚡Low 5W power with wide 6-36V input range

🔄Universal SD/HD video format conversion

🔌Dual SDI & HDMI I/O with reference sync

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Description

🎥 Convert Like a Pro, Stay Ahead of the Stream!

COMPACT PRO GRADE BUILD - Lightweight 247g stainless steel chassis designed for reliable hand-mounting in any setup.
PLUG PLAY VERSATILITY - Dual SDI and HDMI inputs/outputs plus reference input for flawless synchronization.
POWER ANYWHERE ANYTIME - Ultra-efficient 5W power consumption with universal 6-36V DC supply and global adapters.
SEAMLESS VIDEO FORMAT MASTERY - Convert any SD or HD video format effortlessly with industry-leading Teranex algorithms.
FUTURE PROOF SOFTWARE UPGRADES - Keep your converter cutting-edge with easy internal software updates across Mac and Windows.

The Blackmagic Design Mini Converter UpDownCross HD is a compact, professional-grade video converter that seamlessly transforms any SD or HD video format to another. Featuring dual SDI and HDMI inputs/outputs, built-in reference sync, and high-quality Teranex conversion algorithms, it ensures flawless video workflows. With ultra-low 5W power consumption and a wide 6-36V DC input range, it’s perfect for versatile setups worldwide. Compatible with Mac and Windows, it supports easy software upgrades, all housed in a durable stainless steel chassis backed by a 2-year warranty.

Specifications

ASIN	B07C2QMH6W
Best Sellers Rank	#66 in Digital-Analog Converters #144 in Video Converters
Brand Name	Blackmagic Design
Compatible Devices	Monitor
Customer Reviews	4.7 4.7 out of 5 stars (354)
Global Trade Identification Number	09338716005417
Interface	HDMI
Item Weight	247 Grams
Manufacturer	Blackmagic Design
Material Type	Stainless Steel
Maximum Supply Voltage	36 Volts (DC)
Minimum Supply Voltage	6 Volts
Model	BM-CONVMUDCSTD/HD
Mounting Type	Handmontage
Number of Channels	16
Number of Pins	125
Part Number	BM-CONVMUDCSTD/HD
Smart Home Compatibility	Not Smart Home Compatible
UPC	818206535185
Unit Count	1.0 Count
Warranty Description	2-Year Warranty

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49444F

Duties & taxes included

In stock

Sold byAmazon French PolynesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to French Polynesia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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