Sony Digital Betacam DVW-700 Operation Manual page 196

Access the controls on the camcorder through these sleeves.
Front
5
Insert the viewfinder barrel here with the eyecup out,
and fasten the drawstrings around the eyecup.
5-40
Chapter 5 Setting Up the Camcorder
Change the BP-L60 / L90, NP-1B / 1A
Battery Packs through this sleeve.
Change the BP-90A / 90 Battery
Packs through this sleeve.
When connecting external equipment, pass the connection
cables through this sleeve and fasten the drawstrings.
When not using this sleeve, fold it onto the velcro tape at
the bottom of the rain cover.
To attach a WRR-28H / 28M / 28L /
810A / 860A UHF Portable Tuner,
open the velcro tape.