Mask Internal Volume Database

[azapa]

this will only work with contributions! but i have not seen good data on the web, and it is so hard to guess volumes, and for a fact, the manufatures figuers are either not given out (cressi) or wrong (mares).

To measure:
1. Take a open plastic bowl, tuperware etc, your mask, and digital Kitchen scale and a sink of water.
2. Fill the sink, put your mask in and fill it.
3. Insert face to sink of water, and bellow water line, place mask on. Pressure is fine, no straps needed!
4. You won't be able to see, so a assistant is recommended! My 7 year old boy though it was great fun.
5. Take the mask off OVER the plastic bowl, allow all water to fall in to it.
6. Do this 4 to 6 times (according to bowl size/scale range)
7. Weigh the bowl with water in
8. Dump water and weigh without (only wet bowl)
9. mask volume in Cm3 is (weight of bowl with water - weight of bowl) / times you filled bowl. The weight in grams is equal to volume in CM3.

MASK INTERNAL VOLUMES
1. Mares Xvision: 134Cm3
2. Tusa Liberator: 104Cm3
(both above with one piece optical lenses, only a mm or so thicker than standard)

SIGN UP!:friday:friday

 

[trux]

Do not forget the data will be different with each face, and also greatly influenced by the strength you use to push the mask on your face. Besides it, the minimal volume is not too important for deep diving. What plays a much more important role is how well the mask can compress - the difference between the maximal volume (when only lightly pressed on your face) and the minimal volume (when pressed maximally to your face, while still sealing well). The bigger difference, the better.

 

[DivingDane]

Great idea AZAPA! been meaning to start something similar myself.

hopefully have some time on the weekend to get some numbers:

Will be able to get numbers on:

-Cressi Superocchio
-Cressi Occhio+
-OMER Alien
-OMER Bandit
-OMER Aries 39
-OCEANIC shadow (excellent mask)
-Technisub Sphera
-Cressi minima
- beuchat masks mini micro
- Beuchat x-combat

So will post up finding as i get them.

DD

 

[enzolucci]

Don't know if this chart is helpful (info)?http://xtremespearfishing.com/members/info/mask_comparison_chart

 

[Mongrel454]

Great idea AZAPA! been meaning to start something similar myself.

hopefully have some time on the weekend to get some numbers:

Will be able to get numbers on:

-Cressi Superocchio
-Cressi Occhio+
-OMER Alien
-OMER Bandit
-OMER Aries 39
-OCEANIC shadow (excellent mask)
-Technisub Sphera
-Cressi minima
- beuchat masks mini micro
- Beuchat x-combat

So will post up finding as i get them.

DD

OMG you have all those masks?

 

[trux]

I tried with the mask Flow discussed in this thread: http://forums.deeperblue.com/freedi...new-excelent-freediving-mask-sphera-like.html

First I measure 5 times with the mask only very slightly pushed against the face. The resulting volume was 200 ml (or cm³). Then I filled the jar with 10 volumes of the mask tightly pressed against the face like it is in the depth when not equalized - the result was 36 ml (or cm³).

That makes the compressibility ratio of 5.6 - it means theoretically you could descend to almost 46 m without equalizing the mask. Well, so far I only tried 25 m, so cannot confirm the validity of the calculation. However, it is very important that the mask is put on your surface only gently when on surface. If you tighten it up already on the surface, the compressibility ratio will considerably drop.

In fact I believe the mask compresses even better in reality in depth, because I just pushed against the frame, while in water the pressure is equal against the entire mask (including the mask skirt and nose pocket). So quite likely the ratio will be higher than the measured 5.6

 

[azapa]

Don't know if this chart is helpful (info)?http://xtremespearfishing.com/members/info/mask_comparison_chart

:king
that is so cool. do you know the author because I would love to copy the table here with due credits

thanks

 

[Bill]

I'd like to add a few comments here. Please excuse me for repeating myself. I think it's a big mistake to get concerned over mask size. First the mask has to be comfortable and have good vision (for anything but extreme line diving). Technique is far more important. With help from PFI classes, Eric's tutorials and the local champions in Kona, it's relatively easy for an old man with normal size lungs (5.2 litre Vc) to get below 60 with the Beuchat Mondial.

 

[enzolucci]

Cool! Azapa I just joined and you are my first reply, saw it in my email. This site and members seemed experienced, knowledgeable and friendly. I joined after browsing through some different sites.

As for your question I am not too sure found the thread after searching the Aqualung Micromask and the Omer-sub Alien. I will try to look at the site, xtremespearfishing.com again. Though, you have to pay to have total access. I think that is pretty lame it's a little off-putting as far as sense of community. I wonder how bias the information is? I'll sign up for a limited membership and see if I can find the author's info.

I live in O`ahu and there is no shop that carries both masks I have been searching information/opinions about, the Aqualung Micromask and the Omer-sub Alien. I know this has been beaten to death but points like Bill's above and others like Fondueset's point (in another thread) about compressibility make my decision even harder. Does it mean that I would not have to give up precious air with a mask that will compress over one that will not? I wish I could try them both out and return one but no can.

I am a big fan of Hawaiian sling, aka three pronging and would like to get into deeper water. I've got my cousin's old gun and am now looking for a good mask. I understand that comfort is the most important. The two masks in question are similar in seal, on my face, though one has a soft skirt (Alien) and the other a firm skirt (Micromask). Since I can't try them on side by side I am having trouble with which one has a better field of view (I don't know if this is the right term). Especially in real life as the Alien will compress. Or which one is more durable, conditions can get rough here.

I hope I don't offend by bringing up this question in this particular forum. It's just that the thread with the comparison has not been active since January, since I last looked. I just want to know which would be better for spear fishing. Maybe someone could point me in the direction of an online store that allows returns if the fitment is poor. Maybe one that has good deals too as I am a student.

I appreciate all of your comments and apologize that I am off topic, don't really know about forum edict. What's the deal with contacting a DB member and how do I go about it? Again Azapa I will try my best to find the answer to your question.

Happy Labor Day everyone and keep in mind those in the gulf coast, all the best!

Aloha no e Mahalo,

Ian Garvey

 

[azapa]

hello Ian,

Well, post your questions here but try to find the right areas, not always easy! There are hunting and freediving sections and sometimes the questions are very much in between.

The mask issue is quite subtle, and more to do with depths over 25m, less and all the masks on your list (table) will be fine.

Past 25M your lungs are at residual volume, this means very little air to equalize your ears (and mask) with. At great depths a 50Ml smaller mask can add 10M on to your maximal equalization depth (the limiter for most good athletes).

I short, take the best fitting mask, find a good diving buddy, and take a freediving course. PFI and diveFIT do courses in Hawaii I think.

safe dives!

 

[enzolucci]

Hi Azapa,

Thanks for the reply... and not giving me too hard of a time about my off topic question. I was not able to procure the info about the author. I didn't want to pay, but I am thinking about it. What inspired me is my extreeem lack of knowledge. Your answer about low volume masks is still too advanced for me, but I highly appreciate it. It has encouraged me to go out and get a book.

What size/volume mask would be appropriate for Spear Fishing 5-20 meters (as I get more comfortable and build up my stamina)? Any that you would recommend with a good open, unobstructed viewing area? Or what would you pick for Spear Fishing, something that doesn't have too much drag, that’s why I was looking at low volume masks, also the two seemed quite popular, so I went on a search.

Thanks again for your time dealing with a novice. I will still try to find out the author when I end up forking over the money. It's not much but always forget to cancel my accounts in the past and end up paying $$$.

Cheers,

Ian

 

[azapa]

great mask reviews with volumes:

PSMCAFE, toute l'info sur la Chasse sous marine, l'Apnée, Snorkeling & Photo subaquatique - Comparatifs-2

(try yahoo babel fish translator)

See attached results table. I'm sorry I did not ask permission to publish, but all credits to original authors (see link). Will remove if required.

 

[Choque]

Great idea AZAPA! been meaning to start something similar myself.

hopefully have some time on the weekend to get some numbers:

Will be able to get numbers on:

-Cressi Superocchio
-Cressi Occhio+
-OMER Alien
-OMER Bandit
-OMER Aries 39
-OCEANIC shadow (excellent mask)
-Technisub Sphera
-Cressi minima
- beuchat masks mini micro
- Beuchat x-combat

So will post up finding as i get them.

DD

any chance to get this numbers?^^ im especially interested in the masks which aren't already listed here e.g. the cressi minima for example etc.

and i know, old thread is old

 

[rddk]

I tried the tecnisub sphera for some sled dives and i didn't equalized at all i touched 41 metres, since on the sled you just have to equalize i was really focused on mask and ears, than i was supresed cuz you really forget about the mask. The deepest dive i've done was at 52 metres but i was with my micromask i equalized it 1 time at 25 metres than pinched the nose and try mouthfill, when i reached the 52 metres it was a bit compressed but still confortable.

 

[azapa]

I have finally measured my micromask:

standard = 74ml
with 1.75 diopter lenses glued in: 66ml

Incredible mask, only about 40m do I even feel it there

 

[tuboludo]

Are we talking about the Aqualung Micromask ???

 

[azapa]

aqualung=technisub, yes.