Also, soft focus filters Carl Zeiss Softar are available in two strengths: I and II which can be combined (bay VI only).

The bayonet VI filters for Rollei 6000 series can be used for all SL66 lenses from 50-250 and 1000 mm. The current Bayonet VIII filters for 6000 Schneider lenses fit also Distagon 40mm (first model).