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with Sea&Sea Extension Ring 40L [30125]
you can now manually focus a compatible zoom lens
Weight : 64 g/2
This focus gear enables manual focus adjustment for the Canon EF 16-35mm f/4L IS USM lens via the Extension Ring 46 with Focus Knob #30117 when used with Sea&Sea MDX-series housings
Olympus E-M5 / PT-EP08
Ikelite Vacuum Kit for 3/8 Inch Control Gland Options:Vacuum Valve with Sea&Sea Extension Ring 40LVacuum valve fitting for older housings without a spare 1 2" diameter accessory port. The valve's low profile avoids interference with control operation. The included waterproof plug is secured to the fitting to prevent accidental loss. Vacuum pump with gauge included. This valve is appropriate for older clear housings which do not feature a spare accessory port. Simply remove any control with a knob and replace it with this vacuum valve. Refer to the
