Sigma 17-70 behind Fisheye Dome - Sea & Sea housing

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SeaInFocus

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Messages
109
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Location
Huntington Beach, CA
# of dives
1000 - 2499
Does anyone have any experience with the Sigma 17-70 ƒ/2.8-4 DC Macro OS HSM lens behind the Sea & Sea fisheye dome 240? The Sea & Sea port chart says it only needs a 20mm extension ring, and I would like to find out if that's really the case. Most other dome/housing combos that refer to this lens indicate the need for at least a 40mm extension.

Thanks for your insight!

Michael
 
https://www.shearwater.com/products/peregrine/

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