Filters, batteries, cleaning kit, cable releases — the things you notice only when you do not have them.
If you shoot outdoors, a polariser does something no software can. If you shoot long exposures, a decent ND does the same. Everything else is optional until it is not.
We keep the consumables in stock rather than to order, because a dead battery on a Saturday is not a next-week problem.
We sell the swabs and fluid we use ourselves upstairs. If you would rather not do it yourself, the bench does a wet clean from €45, same day when booked before noon.