Solution
When recording 4K movies, using the lenses listed below, it may take long or may have difficulties to achieve focus, comparing to shooting Full HD or HD movies (as of October, 2020).
EF15mm f/2.8 Fisheye
EF24mm f/2.8
EF28mm f/2.8
EF35mm f/2
EF50mm f/1.4 USM
EF50mm f/1.8
EF50mm f/1.8 II
EF50mm f/2.5 Compact macro
EF100mm f/2.8 Macro
EF100mm f/2.8 Macro USM
EF135mm f/2.8 Softfocus
EF400mm f/2.8L USM
EF20-35mm f/2.8L
EF22-55mm f/4-5.6 USM
EF28-70mm f/3.5-4.5
EF28-70mm f/3.5-4.5 II
EF28-80mm f/3.5-5.6
EF28-80mm f/3.5-5.6 II
EF28-80mm f/3.5-5.6 II USM
EF28-80mm f/3.5-5.6 III USM
EF28-80mm f/3.5-5.6 IV USM
EF28-80mm f/3.5-5.6 V USM
EF28-90mm f/4-5.6
EF28-90mm f/4-5.6 II
EF28-90mm f/4-5.6 III
EF28-90mm f/4-5.6 USM
EF28-90mm f/4-5.6 II USM
EF28-105mm f/4-5.6
EF28-105mm f/4-5.6 USM
EF28-200mm f/3.5-5.6
EF28-200mm f/3.5-5.6 USM
EF35-70mm f/3.5-4.5
EF35-70mm f/3.5-4.5 A
EF35-80mm f/4-5.6
EF35-80mm f/4-5.6 II
EF35-80mm f/4-5.6 III
EF35-80mm f/4-5.6 PZ
EF35-80mm f/4-5.6 USM
EF35-105mm f/3.5-4.5
EF35-105mm f/4.5-5.6
EF35-105mm f/4.5-5.6 USM
EF35-135mm f/3.5-4.5
EF38-76mm f/4.5-5.6
EF50-200mm f/3.5-4.5
EF50-200mm f/3.5-4.5L
EF55-200mm f/4.5-5.6 USM
EF55-200mm f/4.5-5.6 II USM
EF70-210mm f/4
EF75-300mm f/4-5.6
EF75-300mm f/4-5.6 II
EF75-300mm f/4-5.6 III
EF75-300mm f/4-5.6 USM
EF75-300mm f/4-5.6 II USM
EF75-300mm f/4-5.6 III USM
EF75-300mm f/4-5.6 IS USM
EF80-200mm f/2.8L
EF80-200mm f/4.5-5.6
EF80-200mm f/4.5-5.6 II
EF80-200mm f/4.5-5.6 USM
EF90-300mm f/4.5-5.6
EF90-300mm f/4.5-5.6 USM
EF100-200mm f/4.5A
EF100-300mm f/5.6
EF100-300mm f/5.6L
EF-S18-55mm f/3.5-5.6
EF-S18-55mm f/3.5-5.6 II
EF-S18-55mm f/3.5-5.6 USM
EF-S18-55mm f/3.5-5.6 II USM
