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Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long
Top-Down Porthole, Extra Long

Top-Down Porthole, Extra Long

59 reviews
$ 49.99

Take great photos of your aquarium from the top down, the way corals are meant to be viewed!  This handy lens housing mounts directly to the barrel of your DSLR lens, allowing you to (carefully) dip the housing in the water and get tack sharp photos without annoying lightbulb reflections or surface ripples.  Using the three thumbscrews to mount the housing on the lens barrel, you can turn the housing to zoom the lens, which can be difficult with traditional top-down photo boxes.

The Porthole features a silicone band for extra grip, and lens standoffs to protect the acrylic from scratches when set face-down.

Inner diameter of the housing is approximately 4" and supports a wide range of lens sizes.  The housing length is 7" overall, and the barrel depth is 6-3/8" to the inside of the acrylic lens.   This allows compatibility with external-focus/zoom lenses and large macro lenses.

Many thanks to our friend Chris Thomas (143gadgets) for the photos taken with the Porthole.  As a professional photographer, he has provided us with valuable feedback during the product's design.

Customer Reviews
4.8 Based on 59 Reviews
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Filter Reviews:
HH
06/02/2021
Halen H.
United States
It works good

It works just as it should, simple and functional with no issues. I like the rubber bumpers that protect the lens when you set it down.

KS
05/03/2021
Kevin S.
United States United States
Good Porthole and customer service

Really enjoying the port hole so far, Inuse it with a Sony 90mm and it works wonderful. The customer service was also really easy to work with and quick with responding. Would recommend this product easily.

RE
04/22/2021
Rocky E.
United States United States
Love it!

Enjoying taking pictures of my corals.

Avast Marine Works Top-Down Porthole, Extra Long Review
DS
04/19/2021
Darrin S.
United States United States
Top down porthole

The quality of the piece is top notch. The only reason I didn’t give 5 stars is because ones I seen others buy came with a cover for the lens.....did Avast quit including this piece? I can see the lens getting scratched pretty easy

DC
04/19/2021
Doug C.
United States United States
Top down viewer

Awesome photo tube and easy to attach. I wish there were some soft bumper caps on the inside of the bolts to protect my lens from the ends of the bolts. It would also feel more secure

Avast Marine Works Top-Down Porthole, Extra Long Review