The SX-70 was the world’s first truly instant camera, and it comes from a time when things moved a bit more slowly. Slower times, slower film speed. Don’t worry, it still develops as fast as the other films – it’s just a little more laidback about it.
The SX-70 works a little differently to other Polaroid cameras. That's why it has its own special SX-70 black-and-white film with a much lower ASA (that's how you measure film speed). Thanks to its greater manual controls and versatility, the SX-70 is super popular with artists, creatives, and people who use the word "aesthetics" a lot. Just remember to always shoot in lots of bright, natural light.