Superbat BNC Cable 3G/HD SDI Cable(1M/3.28ft 75?) Coil Cable BNC to BNC Extension Coaxial Cable for Cameras and Video Equipment?Supports HD-SDI/3G-SDI/4K/8K?SDI Video Cable (Black1Pcs)

BNC connectors are manufactured in 50 Ohm and 75 Ohm specification versions. The two types of connectors are physically different from each other. Connection of the two types of connectors is possible but not best practice: Mixing will not give you the best output. 50 Ohm BNC connectors are used with 50 Ohm cables. 75 Ohm connectors are used with 75 Ohm cables.
50-ohm cables/connectors work well with old analogue video formats. If you are looking for a high quality video output, 50 Ohm will not give you a high quality level.
75-ohmcables/connectors are made for high quality digital video and are able to scale their output depending on the input received. They can also be effectively used on the older analogue video formats, which makes them more versatile and flexible - as they can be used in any situation.