>>3500488You won't need anything higher. 10+16=26mm, lens being 30mm and already above 1:1 will probably allow you to focus on dust on the fore element itself with 10mm already. And I don't think you'll get much higher magnification either. Even theoretically you can only get 30mm extension to work on 30mm lens.
Extension tube allows you to focus closer than the minimum focusing distance to the object. That way they are more effective on larger focal ranges and on lenses that aren't macro already. 30mm's closest focusing range is already really close to the object with 1.5cm (according to this review:
https://robinwong.blogspot.com/2016/09/olympus-mzuiko-30mm-f35-macro-lens.html). You will get even closer to the subject, but it won't have much of an effect. What it will allow is for you to get more back and get same magnifications! This is not insignificant, but I think that for this lens alone, fore lenses would be better option. They increase magnification, while retaining same distance to the object, and same aperture. Look up what thread it's got and search for close up sets.
