What is the correct order for stacking filters on a Super-Angulon lens?
The center filter for the Super-Angulon is designed to modify the brightness distribution in a specific way so it should be the first filter to be screwed onto the lens. Other filters can be screwed to the center filter but to avoid vignetting, use Slim filters only. Keep in mind that the center filter uses a larger accessory thread than the lens, so you will need a larger filter than what would fit directly on the lens. Since Slim filters have no front threads, stacking two filters on top of the center filter will require a regular filter and a Slim filter. This combination shouldn’t vignette as long as no extreme movements are used.