Filter diameters and mounting requirements for RICOH interchangeable lenses and fixed-lens cameras. Checked: 2026-10-06. No physical mounting tests have been performed.
Open the model index
GR II
Documented specification: φ49mm（via RICOH GH-3）
- Mounting option
- Manufacturer adapter
- Compatibility status
- Conditional
- Adapter
- RICOH GH-3
- Mounting method
- Dedicated adapter
- Verified specification
- Dedicated adapter / 49mm diameter (JIS standard from GR III onward)
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use the model-specific adapter. Do not interchange GR III, IIIx and IV adapters. Filter thickness may prevent hood attachment.
GR III
Documented specification: φ49mm（via RICOH GA-1） / φ72mm（via RICOH GA-1 + GW-4）
- Mounting option
- Manufacturer adapter
- Compatibility status
- Conditional
- Adapter
- RICOH GA-1
- Mounting method
- Dedicated adapter
- Verified specification
- Dedicated adapter / 49mm diameter (JIS standard from GR III onward)
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use the model-specific adapter. Do not interchange GR III, IIIx and IV adapters.
- Mounting option
- With manufacturer's conversion lens attached
- Compatibility status
- Conditional
- Adapter
- RICOH GA-1 + GW-4
- Mounting method
- Screw-in on front of conversion lens
- Verified specification
- GW-4 front filter diameter: 72mm (different from the adapter alone at 49mm).
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use GA-1 and GW-4. GW-4 cannot attach directly to the camera. The filter attaches to the front of GW-4. As the view becomes wider, separately check vignetting from frame thickness, stacked filters and the hood.
GR III HDF
Documented specification: φ49mm（via RICOH GA-1） / φ72mm（via RICOH GA-1 + GW-4）
- Mounting option
- Manufacturer adapter
- Compatibility status
- Conditional
- Adapter
- RICOH GA-1
- Mounting method
- Dedicated adapter
- Verified specification
- Adapter specified in HDF FAQ + 49mm diameter in GR III FAQ
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
HDF models also require a dedicated adapter. Built-in HDF and external filters are separate.
- Mounting option
- With manufacturer's conversion lens attached
- Compatibility status
- Conditional
- Adapter
- RICOH GA-1 + GW-4
- Mounting method
- Screw-in on front of conversion lens
- Verified specification
- GW-4 front filter diameter: 72mm (different from the adapter alone at 49mm).
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use GA-1 and GW-4. GW-4 cannot attach directly to the camera. The filter attaches to the front of GW-4. As the view becomes wider, separately check vignetting from frame thickness, stacked filters and the hood.
GR IIIx
Documented specification: φ49mm（via RICOH GA-2） / φ62mm（via RICOH GA-2 + GT-2）
- Mounting option
- Manufacturer adapter
- Compatibility status
- Conditional
- Adapter
- RICOH GA-2
- Mounting method
- Dedicated adapter
- Verified specification
- Dedicated adapter / 49mm diameter (JIS standard from GR III onward)
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use the model-specific adapter. Do not interchange GR III, IIIx and IV adapters.
- Mounting option
- With manufacturer's conversion lens attached
- Compatibility status
- Conditional
- Adapter
- RICOH GA-2 + GT-2
- Mounting method
- Screw-in on front of conversion lens
- Verified specification
- GT-2 front filter diameter: 62mm (different from the adapter alone at 49mm).
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use GA-2 and GT-2, designed for the GR IIIx series. Attaching GT-2 automatically switches to a 50mm crop; it cannot be used with crop disabled. The filter attaches to the front of GT-2.
GR IIIx HDF
Documented specification: φ49mm（via RICOH GA-2） / φ62mm（via RICOH GA-2 + GT-2）
- Mounting option
- Manufacturer adapter
- Compatibility status
- Conditional
- Adapter
- RICOH GA-2
- Mounting method
- Dedicated adapter
- Verified specification
- Adapter specified in HDF FAQ + 49mm diameter in GR III FAQ
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
HDF models also require a dedicated adapter. Built-in HDF and external filters are separate.
- Mounting option
- With manufacturer's conversion lens attached
- Compatibility status
- Conditional
- Adapter
- RICOH GA-2 + GT-2
- Mounting method
- Screw-in on front of conversion lens
- Verified specification
- GT-2 front filter diameter: 62mm (different from the adapter alone at 49mm).
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use GA-2 and GT-2, designed for the GR IIIx series. Attaching GT-2 automatically switches to a 50mm crop; it cannot be used with crop disabled. The filter attaches to the front of GT-2.
GR IV
Documented specification: φ49mm（via RICOH GA-3） / φ72mm（via RICOH GA-3 + GW-4）
- Mounting option
- Manufacturer adapter
- Compatibility status
- Conditional
- Adapter
- RICOH GA-3
- Mounting method
- Dedicated adapter
- Verified specification
- Dedicated adapter / 49mm diameter (JIS standard from GR III onward)
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use the model-specific adapter. Do not interchange GR III, IIIx and IV adapters.
- Mounting option
- With manufacturer's conversion lens attached
- Compatibility status
- Conditional
- Adapter
- RICOH GA-3 + GW-4
- Mounting method
- Screw-in on front of conversion lens
- Verified specification
- GW-4 front filter diameter: 72mm (different from the adapter alone at 49mm).
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use GA-3 and GW-4. GW-4 cannot attach directly to the camera. The filter attaches to the front of GW-4. As the view becomes wider, separately check vignetting from frame thickness, stacked filters and the hood.
GR IV HDF
Documented specification: φ49mm（via RICOH GA-3） / φ72mm（via RICOH GA-3 + GW-4）
- Mounting option
- Manufacturer adapter
- Compatibility status
- Conditional
- Adapter
- RICOH GA-3
- Mounting method
- Dedicated adapter
- Verified specification
- GA-3 specified in the model FAQ; 49mm JIS standard in the GR IV FAQ.
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use GA-3 to mount a 49mm filter. Do not confuse it with GA-1 or GA-2. Built-in and external filters are separate.
- Mounting option
- With manufacturer's conversion lens attached
- Compatibility status
- Conditional
- Adapter
- RICOH GA-3 + GW-4
- Mounting method
- Screw-in on front of conversion lens
- Verified specification
- GW-4 front filter diameter: 72mm (different from the adapter alone at 49mm).
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use GA-3 and GW-4. GW-4 cannot attach directly to the camera. The filter attaches to the front of GW-4. As the view becomes wider, separately check vignetting from frame thickness, stacked filters and the hood.
GR IV Monochrome
Documented specification: φ49mm（via RICOH GA-3） / φ72mm（via RICOH GA-3 + GW-4）
- Mounting option
- Manufacturer adapter
- Compatibility status
- Conditional
- Adapter
- RICOH GA-3
- Mounting method
- Dedicated adapter
- Verified specification
- GA-3 specified in the model FAQ; 49mm JIS standard in the GR IV FAQ.
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use GA-3 to mount a 49mm filter. Do not confuse it with GA-1 or GA-2. Built-in and external filters are separate.
- Mounting option
- With manufacturer's conversion lens attached
- Compatibility status
- Conditional
- Adapter
- RICOH GA-3 + GW-4
- Mounting method
- Screw-in on front of conversion lens
- Verified specification
- GW-4 front filter diameter: 72mm (different from the adapter alone at 49mm).
- Verification category
- Official camera manufacturer
- Checked on
- 2026-10-06
Use GA-3 and GW-4. GW-4 cannot attach directly to the camera. The filter attaches to the front of GW-4. As the view becomes wider, separately check vignetting from frame thickness, stacked filters and the hood.
WG-6
Documented specification: φ37mm
- Mounting option
- Direct front mounting
- Compatibility status
- Supported
- Adapter
- Not required
- Mounting method
- Front screw-in
- Verified specification
- The model-specific FAQ explicitly permits standard 37mm filters.
- Verification category
- Official manufacturer
- Checked on
- 2026-10-06
A 37mm filter can attach directly to the front of the lens. Do not assume compatibility with other WG generations. Interference, vignetting and underwater use with specific products have not been tested on actual equipment.
WG-7
Documented specification: φ37mm
- Mounting option
- Direct front mounting
- Compatibility status
- Supported
- Adapter
- Not required
- Mounting method
- Front screw-in
- Verified specification
- The model-specific FAQ explicitly permits standard 37mm filters.
- Verification category
- Official manufacturer
- Checked on
- 2026-10-06
A 37mm filter can attach directly to the front of the lens. Do not assume compatibility with other WG generations. Interference, vignetting and underwater use with specific products have not been tested on actual equipment.
GR
- Mounting method
- Dedicated adapter
- Adapter
- GH-3
- Verified specification
- 49mm
- Verification category
- Official specifications verified
- Checked on
- 2026-10-07
The manufacturer's GH-3 hood and adapter are required. This is not direct mounting on the camera body.
GR DIGITAL
- Mounting method
- Dedicated adapter
- Adapter
- GH-1
- Verified specification
- 37mm
- Verification category
- Official specifications verified
- Checked on
- 2026-10-07
The manufacturer's GH-1 hood and adapter are required. This is not direct mounting on the camera body.
GR DIGITAL II
- Mounting method
- Dedicated adapter
- Adapter
- GH-1
- Verified specification
- 37mm
- Verification category
- Official specifications verified
- Checked on
- 2026-10-07
The manufacturer's GH-1 hood and adapter are required. This is not direct mounting on the camera body.
GR DIGITAL III
- Mounting method
- Dedicated adapter
- Adapter
- GH-2
- Verified specification
- 43mm
- Verification category
- Official specifications verified
- Checked on
- 2026-10-07
The manufacturer's GH-2 hood and adapter are required. This is not direct mounting on the camera body.
GR DIGITAL IV
- Mounting method
- Dedicated adapter
- Adapter
- GH-2
- Verified specification
- 43mm
- Verification category
- Official specifications verified
- Checked on
- 2026-10-07
The manufacturer's GH-2 hood and adapter are required. This is not direct mounting on the camera body.
GX200
- Mounting method
- Dedicated adapter
- Adapter
- HA-2
- Verified specification
- 43mm
- Verification category
- Official specifications verified
- Checked on
- 2026-10-07
Attaches to the adapter section of the manufacturer's HA-2.
Caplio GX100
- Mounting method
- Dedicated adapter
- Adapter
- HA-2
- Verified specification
- 43mm
- Verification category
- Official specifications verified
- Checked on
- 2026-10-07
Attaches to the adapter section of the manufacturer's HA-2.
GXR GR LENS A12 50mm F2.5 MACRO
- Mounting method
- Front screw-in
- Verified specification
- 40.5mm
- Verification category
- Official specifications verified
- Checked on
- 2026-10-07
Dedicated GXR lens/sensor unit. Filter diameter is specific to each unit.
GXR GR LENS A12 28mm F2.5
- Mounting method
- Front screw-in
- Verified specification
- 40.5mm
- Verification category
- Official specifications verified
- Checked on
- 2026-10-07
Dedicated GXR lens/sensor unit. Filter diameter is specific to each unit.
GXR RICOH LENS A16 24-85mm F3.5-5.5
- Mounting method
- Front screw-in
- Verified specification
- 55mm
- Verification category
- Official specifications verified
- Checked on
- 2026-10-07
Dedicated GXR lens/sensor unit. Filter diameter is specific to each unit.
Coverage and selection notes
We prioritize manufacturer specifications, FAQs, manuals and official distributor information. Third-party adapters are recorded only where the accessory manufacturer explicitly lists compatibility. Coverage does not include every generation, region or mount. Unconfirmed does not mean incompatible.
A matching diameter does not guarantee compatibility with a specific TOKYO GRAPHER product, freedom from vignetting or stacked-filter use. Check the exact model, generation, frame thickness, hood, widest focal length, macro operation and manufacturer restrictions such as one-filter-only use. No physical mounting tests have been performed.