Don’t worry about the distance anymore! Be always in focus for your macro shots!
In the Holga bible The World Through A Plastic Lens Mandi tells us how to use cigarette paper to focus when a macro lens (the one coming with the Fisheye adaptor) is mounted on our sweet Holga. Take this great advice and build yourself a focusing frame. You will have always the good distance with this frame. Fix it on the macro lens in order to be able to fit it ALSO with the Ringflash.
See some doubles made with Vicuna… I went to an orchid garden for the first layer while he took a walk in the forest for the second layer.