You want approximately 5 particles minimum across the smallest aperture.
So in the case of a 0.8mm device, we use .017" pads with a round 0.020" aperture on a 6 thou thick stencil foils. Here, 0.020" diameter equals 0.50mm. This gives us 0.50/5=100microns. That means that you will be fine with a standard Type 2 paste (see J-STD-004).