Yes I mean diopters but those cheap ones are often called macro lenses like from Polaroid which cost 20€ 4 diopters from +1 to +10
The Isco has a Front thread but there is a Ring screwed in which tightens the Front Glass. I thought I could use a stepdownring instead of the Ring which tightens the Glass and enables me to use diopters
I will Look at RISE later - thanks a lot!