Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Hi there, I just wanted to check if this housing allows for the camera to use the zoom function of the camera? Thanks!
Document: We really liked the ELPH 520 camera, but wanted an underwater camera for our trip to Hawaii. We were nervouse about leakage but this housing worked perfectly and we got many amazing snorkel pics and video's! Highly recommend this housing, because we also really LOVE our ELPH 520 camera and this housing made it possible to turn it into an underwater camera that both my husband and I could agree on.
I bought this case to allow me to use my new Canon camera while on our recent cruise, rather than buy a separate waterproof camera. We couldn't be happier! The case allows full functionality of the camera, with complete protection from sand and water. I got some great underwater shots of fish that were not so easy to pick out, due to their silver color.
This is a SNORKEL camera case only. Scuba divers take note. I would have appreciated in the product description knowing it's only rated for 3 meters (10 ft at best). For how much it costs there is a Polaroid waterproof case for like $20 that will get the job done at a fraction of the cost of this. Since I wanted it for my scuba trip I immediately returned it. Just know that this will not go below 10 ft...
My son-in-law was very pleased with this gift. I received it on time and it was packaged well. Now all he has to do is use it.
Yes, there are cheaper cases that might work just fine, but this one has access to all the controls including zoom (which none of the other one's have). Very nice ergonomic feel...works in one hand quite well. You can tell this case was made for this camera...the fit is perfect.One note: The instructions say to replace the O ring once a year. Hopefully this is not a costly process. Cheers!
This was a Christmas gift for my husband and he loves it. He is a little clumsby and it will help it keep his new camera safe.
The flash cannot work properly because the case dont permit! Also, the camera cannot have any rope! But, the waterproof looks like work perfect
I recommend getting a chums floating strap to hook onto case so u don't have to keep a death grip on it! Better than waterproof cameras because it can be used in ocean.
I chose a 5 star rating for this waterproof case because it never leaked  after countless times of opening and closing throughout my trip(battery life sucks). I went to Hawaii and took it in the Grand Wailea pool park and got great pics. I went snuba diving in pacific ocean and was able to get pics and video 18ft down even though case says10 ft.  Pics of waterfalls upclose no sweat, just wipe the front off.
Answer: Hi Anne,   Yes it does allow for the lens to extend out (zoom) fullly and this works VERY well. Make sure you have the silicone to wipe on the rubber seal (gasket) to ensure that you always have a water/air tight seal. Amazon sells the silicone as well as the cleaning/maintenance pack that is inexpensive and WELL worth the purchase. Hope this helps and enjoy your waterproof case Anne!  Tod