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■Extension Ring S

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In combination with the Dome Port 2, "Tokina AT-X107DX Fisheye" / "Sigma/10mm F2.8 EX DC FISHEYE HSM" lens are supported.

■Effective length: 13mm (0.5in)
■Weight: 58.3g (2.1oz) [air]
■Material: Corrosion-resistant aluminum alloy (rigid black alumite)

■Extension Ring M

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In combination with the "MRS100 Port Type S", "Canon EF180mm F3.5L Macro USM" lens is supported.
In combination with the "Dome Port 2" / "Extnsion Ring 36" or "Dome Port 115" / "Extnsion Ring 36", "Canon EF16-35mm F2.8L II USM" lens is supported.

■Effective length: 31mm (1.2in)
■Weight: 115.3g (4.1oz) [air]
■Material: Corrosion-resistant aluminum alloy (rigid black alumite)

■Extension Ring L

Extansion Ring L

Compatible with Kenko teleconverter "3XM Teleplus PRO300 for Canon".

■Effective Length: 65mm (2.6in)
■Weight: 188.5g (6.6oz) [air]
■Material: Corrosion-resistant aluminum alloy (rigid black alumite)

■Extension Ring 18

Extansion Ring 18

Compatible with Kenko teleconverter "TELEPLUS HD DGX 1.4X Canon EOS", "1.5X Teleplus MC4 DG for Canon" and "1.5X Teleplus SHQ for Canon". Further supports Canon EF8-15 F4L Fisheye USM in combination with Dome Port 2 or Dome Port 115.

■Effective Length: 18mm (0.7in)
■Weight: 83.1g (2.9oz) [air]
■Material: Corrosion-resistant aluminum alloy (rigid black alumite)

■Extension Ring 36

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Compatible with Kenko teleconverter "TELEPLUS HD DGX 2.0X Canon EOS", "Teleplus MC7 AF 2.0X DGX for Canon EOS", "2X Teleplus MC7 DG for Canon" and "1.5X Teleplus MC7 for Canon".
In combination with the "Dome Port 2" or "Dome Port 115", "Canon EF-S10-18mm F4.5-5.6 IS STM" lens is supported.
In combination with the "Dome Port 2" / "Extnsion Ring M" or "Dome Port 115" / "Extnsion Ring M", "Canon EF16-35mm F2.8L II USM" lens is supported.

■Effective Length: 36mm (1.4in)
■Weight: 135.1g (4.8oz) [air]
■Material: Corrosion-resistant aluminum alloy (rigid black alumite)

■Extension Ring 58

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Compatible with "Canon EXTENDER EF1.4x".

■Effective Length: 58mm (2.3in)
■Weight: 188.3g (6.6oz) [air]
■Material: Corrosion-resistant aluminum alloy (rigid black alumite)

■Extension Ring 81

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Compatible with "Canon EXTENDER EF2x".

■Effective Length: 81mm (3.2in)
■Weight: 246.7g (8.7oz) [air]
■Material: Corrosion-resistant aluminum alloy (rigid black alumite)

■MF EXT. Ring M (w/o control ring)

MF EXT. Ring M  (w/o control ring)

In combination with the "Dome Port 2", "Canon EF20mm F2.8 USM" lens is supported.

■Effective Length: 3.15mm (1.2in)
■Material: Corrosion-resistant aluminum alloy (rigid black alumite)

*[MF Port] series ("MF Standard Port 2"/ "MF Wide Port"/ "MF Flat Port") and "MF EXT. Ring M" are not compatible with "Extension Ring" other than "MF EXT. Ring M".

X-2 for EOS 50D/40D System ChartX-2 for EOS50D/40D System Table