A cool alternative for those times when you lack of 100 iso film is to redscale a 400 iso Lomography color negative film.
One of these days the Sun was shining, it was a perfect day to shoot 100 iso film, the only problem was my film stock, I realized I only had 400 iso color negative and B&W films. I knew there was no way I could buy a decent slide film in time to enjoy that perfect day so I had to improvise.
I took one Lomography color negative 400 iso film and an empty canister (usually I ask for empty canisters in my usual lab, you never know when you might need them), lock myself in my darkroom (my bathroom) and reversed the Lomography film into the empty canister, the process is easy, just use some duct tape to fix the Lomography film to the tip of the remaining film on the empty canister (usually my lab leave a little bit of film out), rewind it into the new canister a cut the tip in the end so it could fit into my camera spool and it’s done! A brand new 100 iso, redscale film.
The only thing left to do was adjust my camera setting to 100 iso and shoot. I like the results, I achieved great reds oranges and yellows and some light leaks (my darkroom isn’t as dark as I expected) but, overall, it was a great solution for my problem, a 100 iso film in no time.