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Aquatica Port Extension Ring with Focusing Knob for Canon EF 17-40mm f/4 Lens

B&H # AQPEC1740 Mfr # 18465
Usually ships in 7-14 business days

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This is a Special order item. Est. arrival at B&H is 7-14 business days (subject to availability). Your order will be charged at time of shipment. Item is non-cancelable and non-returnable.
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You Pay: $440.00
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Product Highlights
  • Extends Length of Port by 2.50"
  • Retractable Focusing Knob
  • Optimized for 9.25" Megadome Port
  • Depth Rated to 300' (91 m)

This Port Extension Ring with Focusing Knob from Aquatica features a manual focusing knob for the Canon EF 17-40mm f/4 zoom lens. The ring extends the length of the port by 2.50". The knob connects to the lens focus ring via a gear. This knob has a retractable mechanism that makes installing and removing the lens a quick and simple operation. Optimized for the Aquatica 9.25" (23.50 cm) Megadome port, the ring will also work with the 8" dome port. It features anodized aluminum construction and a depth rating of 300' (91 m).

Canon, Sigma and Tokina Type 1 Lens Chart
Canon, Sigma and Tokina Type 2 Lens Chart
Canon Type 4 Lens Chart

Length Adds 2.50" (63.5 mm) to port
Construction Anodized aluminum
Depth Rating 300' (91 m)
Weight 1.0 lb (0.45 kg)
Dimensions 4.81 x 6.60 x 3.41" (12.22 x 16.76 x 8.66 cm) (Diam. x W x H)
Aquatica Port Extension Ring with Focusing Knob for Canon EF 17-40mm f/4 Lens
  • 1 Year Limited Warranty
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