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Cavision 58mm Conical Step-up Ring with 85mm Outside Diameter

BH #CACSUR855840 • MFR #ARC85-58D40
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Cavision 58mm Conical Step-up Ring with 85mm Outside Diameter
Key Features
  • Screws onto the Front of the Lens
  • Suitable for Clamp-on Applications
The 58mm Conical Step-up Ring with 85mm Outside Diameter from Cavision is an AR series, conical adapter ring. The ring screws onto the front of a lens with 58mm filter thread and provides an 85mm O.D. surface for mounting a clamp-on matte box. Conical rings are intended for special purposes – for example – if the camera has a low overhanging microphone and the matte box needs to be pushed further out in front of the lens. The ring has a depth of 1.57" (40mm).
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Cavision ARC85-58D40 Overview

The 58mm Conical Step-up Ring with 85mm Outside Diameter from Cavision is an AR series, conical adapter ring. The ring screws onto the front of a lens with 58mm filter thread and provides an 85mm O.D. surface for mounting a clamp-on matte box. Conical rings are intended for special purposes – for example – if the camera has a low overhanging microphone and the matte box needs to be pushed further out in front of the lens. The ring has a depth of 1.57" (40mm).

58mm rear thread (male)
85mm outside diameter
1.57" (40mm) depth

Cavision ARC85-58D40 Specs

Compatible Matte Box
85 mm Opening / Cavision Clamp-On Matte Box 
Packaging Info
Package Weight
0.1 lb
Box Dimensions (LxWxH)
4.05 x 4.05 x 2.55"

Cavision ARC85-58D40 Reviews

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Does the extra protrusion of this conical style ...

Does the extra protrusion of this conical style adapter cause vignetting at the widest angle of a Canon XF605 camcorder?
Asked by: Dale
The Cavision 58mm Conical Step-up Ring with 85mm Outside Diameter (B&H# CACSUR855840), like all similar lens attachments, will eventually cause vignetting when shot at a wide enough angle. The widest focal length of the lens of the Canon XF605 UHD 4K HDR Pro Camcorder (B&H# CAXF605) is 8.3mm (25.5mm in full frame equivalent terms), but that is not wide enough to result in vignetting with the aforementioned matte box adapter (i.e. step-up ring).
Answered by: Yoni S
Date published: 2022-10-19
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