The Fujifilm GF 80mm f/1.7 R WR exhibits a considerable amount of focus breathing (“breathing”), an undesirable trait for both videography and focus stacking.
This 13-frame series shows the change in magnification:
Fujifilm GF 80mm f/1.7 R WR Focus Breathing
f9 @ 1/40 sec electronic shutter, ISO 100; 2021-06-01 19:11:59[low-res image for bot]
Fujifilm GFX100S + Fujifilm GF 80mm f/1.7 R WR @ 65.5mm equiv (80mm)
ENV: White Mountains, altitude 11600 ft / 3536 m, 60°F / 15°C
RAW: vignetting corrected, push 0.33 stops, +40 Shadows, +20 Whites, +10 Dehaze, +10 Clarity