I just bought a fuji X-Pro 1 and I need to buy a diopter for it. There are no camera shops near to where I live so how do I go about knowing which strength to order? I use reading glasses with a strength of +2.5. Does it follow that the diopter I need would be a +2.5, although fuji only do +2 and +3. I assume that if the diopter does follow the same strength as reading glasses, then the +3 is the appropriate one to buy?
Thanks,
Brian