Gyakorlatilag is létezik: http://www.ebay.co.uk/itm/Canon-135mm-Hot-Shoe-Finder-for-LEICA-Canon-NIKON-Contax-REID-135mm-RFr-Lenses-/190675375764?pt=UK_Photography_Viewfinders_Eyecups&hash=item2c65235694#ht_2863wt_701