The aluminium dove-tailed AP-620 Sony FE 200-600 f/5.6-6.3 G OSS Replacement Foot lets you attach accessories to the top as well as the bottom of the foot.
Wimberley AP-620 Lens Replacement Foot
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Used Sony FE 200-600mm f/5.6-6.3 G OSS E-Mount Lens SEL200600G - Adorama
Wimberley AP-620 Replacement foot for Sony 200-600 f/5.6-6.3 G OSS - Outdoorphoto - South Africa
Wimberley Ap-620 Replacement Foot For Sony Fe 200-600 F/5.6-6.3 G Oss
SONY 200-600 - レンズ(ズーム)
The lens replacement foot is tailor-made for Sony FE 200-600mm f/5.6-6.3 G OSS Lens; the net weight is about 100g; The lens tripod mount ring
iShoot Replacement Lens Foot IS-THS260 for Sony FE 200-600mm f/5.6-6.3 G OSS Super Telephoto Zoom E-Mount Lens SEL200600G - Arca-Swiss Style