Just received two rolls of Velvia 50 documenting my first venture into medium format macro photography. I shot backlit cactus flowers in nature at magnifications around 1.5:1. I am more than happy with the results. I will certainly spend more time with macro photography in future. This is a completely new and exciting chapter for me. I adapted a Schneider-Kreuznach M-Componon 80mm f4 to my Pentax 67II and used the Pentax helicoid extension tube to focus. I obtained two adapters: 1) #0 to M39 (Schneider-Kreuznach adapter ring no. 10711) and 2) M39 to Pentax 67 (from a Chinese seller on *bay). The helicoid extension tube alone is sufficient to yield magnifications up to 1:1.1. In order to reach higher magnifications, I added 6cm of M39 extension tubes (taken from an old Leica BEOON copy stand) which brings me to around 1.6:1. Does anyone know the optimal aperture of the M-Componon 80mm? I used f11 for my first attempts but plan to play around with this in future.