Lens boards for large format cameras ensure secure shutter mounting and consistent lens alignment. Photographers who swap lenses in the field gain confidence that assemblies will remain light-tight and stable. Is the eTone Lens Board a practical upgrade for owners of Toyo and K.B. Canham 4x5 cameras?
⚡ At a Glance
- • Mount Compatibility: Accepts Copal, Compur and Prontor shutters size #0, 34.6mm hole with 17mm recessed depth and centre-drilled hole
- • Best for: Photographers using Toyo field 45A, 45AII, 45CF, 45FA and K.B. Canham 4x5 systems
- • Not ideal for: Cameras or shutters that require a non-recessed board or a different shutter size
110x110mm recessed lens board in aluminium alloy with a black finish for large format use. Designed around a size #0 shutter footprint and a centre-drilled hole for accurate lens placement.
Secure lens mounting - with a 17mm recessed Copal/Compur/Prontor #0 mount
A 17mm recess creates space for the shutter assembly so the shutter sits flush within the board, while the 34.6mm hole diameter matches size #0 shutters. A drilled centre hole ensures the shutter and lens can be aligned precisely.
Secure mounting reduces the chance of light leaks and keeps the shutter correctly positioned, making lens changes quicker and more reliable during shoots.
Lightweight durability - with aluminium alloy construction and black finish
Manufactured from aluminium alloy, the board combines low weight with structural rigidity and a matte black finish to minimise internal reflections. The 110x110mm format keeps the board compact while retaining strength.
The combination of a light board and robust material reduces carry weight for field work, while the finish helps prevent stray reflections affecting exposures.
Straightforward compatibility with Toyo and K.B. Canham 4x5 cameras - with standard dimensions and precise drilling
Dimensions and mounting hole positions are matched to Toyo field 45 series and K.B. Canham 4x5 specifications, allowing direct replacement or interchange. Centre-drilled accuracy helps maintain lens axis alignment.
Owners of the listed cameras can swap boards without modification, simplifying lens swaps and reducing setup time on location.
✨ The 4 Key Reasons for eTone Lens Board
- Recessed 17mm mount - Ensures reliable shutter seating and reduces light leakage risk
- Aluminium alloy build - Keeps the board light while remaining strong for field use
- 110x110mm footprint - Fits common large format camera openings for easy replacement
- Centre-drilled hole - Supports accurate lens centring and straightforward installation
📋 Technical Details at a Glance
- Category: Large format lens board
- Size: 110 x 110 mm
- Mount type: Recessed for Copal/Compur/Prontor size #0
- Hole diameter: 34.6 mm
- Recess depth: 17 mm
❓ Frequently Asked Questions
Q: Will this board fit my Toyo field 45A camera?
A: Yes, compatibility is stated for Toyo field 45A, 45AII, 45CF, 45FA and K.B. Canham 4x5 cameras.
Q: Which shutter types and size does the board accept?
A: Compatible with Copal, Compur and Prontor shutters size #0, using a 34.6mm hole and a 17mm recess.
Q: What is the board made from and what finish does it have?
A: Made of aluminium alloy with a black finish and a centre-drilled hole for accurate lens alignment.
🏆 Our Verdict
The eTone Lens Board suits large format photographers who use Toyo field cameras or K.B. Canham 4x5 systems and need a reliable, swap-ready board. Precision recessing, correct hole sizing and aluminium construction make it a practical choice for field work. While cost considerations vary, the durable build and straightforward compatibility deliver long-term value for active large format users.
