I forgot how to calculate correct exposure with a red filter on my TLR lens (was it a factor of 8 or 16?).
I forgot the cable release for the above Yashica Mat 124G TLR camera (but I think I managed without it).
I forgot to put my wellingtons in the boot of my car.
I forgot how lovely Ilford FP4 is to scan (it just lays flat in the holder and behaves itself).
