Will these work for 300ohm to 75ohm outdoor antenna to coaxial connection?

300 ohm cable is generally twin-axial balanced line and does not have connectors. Generally a transformer us needed. These connector are 50 ohms, so there will be a mismatch to 75 ohm cable. Not a big deal for receive applications. Most 75 ohm coax cable takes F type connectors. "These are not the connectors you are looking for" IF you need 50 ohm SMA to BNC, adapters, these have worked fine for me.

Will these work for sdi video camera connections?

For SDI you usually RG-59 or RG-6 and SMA is really for much lower performance thinner RF cable so it will work for a short run but probably not optimal

Yes .... you may use these adapters in a 50ohns cable

SMA to BNC Kits 2 Set RF Coaxial Adapter Male Female Coax Connector 8 Pieces

Product ID: 254877374

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Details

Brand
exgoofit
Cable Type
Coaxial
Compatible Devices
for SDR PC
Connector Type
BNC Coaxial RF
Special Feature
Gold Plated

✨Gold-plated connectors

📡50Ω impedance

🔌8 adapters

Description

🔗 Connect with Confidence!

COMPLETE SET - Includes 8 essential adapters to cover all your coaxial connection requirements.
DURABLE DESIGN - Crafted with gold-plated copper for enhanced corrosion resistance and longevity.
HIGH EFFICIENCY - Experience superior transmission with a low VSWR, ensuring minimal signal loss.
BROAD APPLICATION - Perfect for a variety of devices including WiFi, ham radios, and base stations.
VERSATILE CONNECTIVITY - Seamlessly connect BNC antennas to SMA radios for all your RF needs.

The exgoofit SMA to BNC Kits include 8 high-quality RF coaxial adapters designed for seamless connectivity between BNC and SMA interfaces. With a 50Ω impedance and gold-plated copper construction, these adapters ensure low signal loss and high transmission efficiency, making them ideal for a wide range of RF applications.

Specifications

ASIN	B078K5563Y
Best Sellers Rank	#773 in Audio & Video Connectors & Adapters
Brand Name	exgoofit
Cable Type	Coaxial
Color	silver
Compatible Devices	for SDR,PC,Handheld Radios, Scanner,Walkie Talkie
Compatible Phone Models	No Compatible Phone Models
Connector Gender	Female-to-Female, Male-to-Female
Connector Type	BNC, Coaxial, RF Connector, SMA
Customer Package Type	Standard Packaging
Customer Reviews	4.6 4.6 out of 5 stars (465)
Data Transfer Rate	3 Gigabits Per Second
Ethernet Cable Category	Cat 6a
Frequency	3 GHz
Gauge	16.0
Indoor Outdoor Usage	Indoor, Outdoor
Item Weight	0.11 Pounds
Manufacturer	exgoofit
Model	8541741496
Number of Items	8
Number of Pins	8
Other Special Features of the Product	Gold Plated, Low Loss
UPC	795042075238

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