Yeah. Ive just seen a video and it mentioned very cheap ones don't have rods meaning you cannot change the aperture unless the lens enables you too.
Decisions! I bought cokin filter holders/adaptor ring but I just need the slides. Both the slides and the extension tube as well as the 50mm f1.8 lens I want are all around £50 each lol. I need to get my old 400D with the 18-55mm kit lens sold!