Apertures:
aperture 1 standard round 7 mills
aperture 2 standard round 10 mills
aperture 3 standard rectangle 21 21 150 21 mills
aperture 4 standard rectangle 21 21 21 150 mills
aperture 5 standard rectangle 21 21 200 21 mills
aperture 6 standard rectangle 21 21 21 200 mills
aperture 7 thermalRelief round 60 mills
aperture 8 standard round 50 mills
aperture 9 standard round 60 mills
aperture 10 standard rectangle 26 26 156 26 mills
aperture 11 standard rectangle 26 26 26 156 mills
aperture 12 standard rectangle 26 26 206 26 mills
aperture 13 standard rectangle 26 26 26 206 mills
aperture 14 standard round 100 mills
aperture 15 standard square 70 mills
aperture 16 standard round 70 mills
aperture 17 thermalRelief square 75 mills
aperture 18 thermalRelief round 75 mills
aperture 19 standard square 75 mills
aperture 20 standard round 75 mills
aperture 21 standard round 200 mills
aperture 22 standard round 320 mills
aperture 23 standard round 25 mills
aperture 24 standard round 140 mills
For a rectangle aperture the 4 numbers a b c d are: