willow focus test
This shot is wide open and focused on the center of the image, the base of the rightmost group of branches. The actual focus is about 4-6 cm towards the camera. This lens design experiences focus shift, with a close image like this focusing about 2 cm toward infinity for each f-stop closed. That implies that it will focus accurately somewhere around f/2.8 to f/4. Which may be pretty good, as the lens should be sharp there. However, when using it wide open I'll need to remember to step forward a couple inches after focusing. Further testing is required, I didn't use f/2-f/4 on this roll. Everything is great at f/5.6.
willow focus test
This shot is wide open and focused on the center of the image, the base of the rightmost group of branches. The actual focus is about 4-6 cm towards the camera. This lens design experiences focus shift, with a close image like this focusing about 2 cm toward infinity for each f-stop closed. That implies that it will focus accurately somewhere around f/2.8 to f/4. Which may be pretty good, as the lens should be sharp there. However, when using it wide open I'll need to remember to step forward a couple inches after focusing. Further testing is required, I didn't use f/2-f/4 on this roll. Everything is great at f/5.6.