Akira Yabe zoom lens design

3 days of zoom lens design

First day:

• From plates (200 solutions by all night run)

Second day:

• With 2 aspherical lenses (100 solutions by all night run)

Third day:

• With real stop (20 solutions by 2 hour run)
• With fixed clear aperture (20 solutions by 4 hour run)
• Automatic real glasses selection

Wide cine lens

• Focal length 25-75mm FNO 2.8
• Image diagonal 43mm
• Total track 330mm (fixed)
• front surface height < 64mm (result 63mm)
• last surface height < 24.4mm (result 14.1mm)
• BFL > 40mm and MOD 60cm
• breathing 0.4% at 60cm (result 0.4% at wide 0.7% at tele)
• distortion < 5% (result 4%)
• RI 40%

Lens structure

• 6 groups (fixed first group + 5 zooming groups)
• Focusing group number (to be optimized)
• 18 lenses
• Lens count of each group (to be optimized)
• Sign of power of each group (to be optimized)
• 2 aspherical lenses (position to be optimized)

From plates

Initial group structure

Solutions from parallel plates

Best design from parallel plates

Asperical lenses and real stop

Real material and real aperture