Another 40mm in service here, this is the Nikkor 40mm f/2 SE on my modified Z5. The internal Kolari 720nm clip-in filter was used. This filter approach solves some issues for IR and adds its own for specific lenses, the 40mm being one of these (you get colour shifts across the frame). As the issue isn't prominent with the 40mm, I mostly can overcome any nasty effects.
Fallen and hibernating leaves of the Silver Birch Betula pendula. Like the other birch species here in my country, the Silver Birch is rather promiscuous and many trees in my region are F1 or F2 hybrids with the Downy Birch B. pubescens. The leaves depicted here have the typical triangular shape of B. pendula foliage and a tendency to doubly serrated leaf margins, so should be put under that species label.
Whilst not the shapest lens in my arsenal, the 40mm Nikkor draws images with more than sufficient detail and handles very well on the Z5 and Zf. I consier its bokeh to be preferable to that of the Voigtländer equivalents.