Prism II or Se7en?

[guruboy]

for the same price, which would you rather buy?

Prism II or Se7en Rec package?

For use in mostly recreational diving in the near future.

 

[tbone1004]

which electronics system on the Prism II?
which computer on the Se7en and which battery module?

more than likely prism II though

 

[RainPilot]

which electronics system on the Prism II?
which computer on the Se7en and which battery module?

more than likely prism II though

If it's rec diving the battery is not super important, any one will work.
The Seven is only available with the paddle at the moment, the M28 will not be included at that price point.

I don't know the Prism at all, the Poseidon will have the solid state O2 sensors soon, which may be a factor. They are not cheap to have repaired but they do work very well. I'm very happy with my MK6, the Sevens I have dived.

The Bluetooth setting functionality is nice and the BOV is a piece of genius, especially the automatic switch on the gas mixture on bailout.

A lot of people complain that the unit holds your hand too much, as a new RB diver (50 hours) I'm ok with that.

 

[guruboy]

which electronics system on the Prism II?
which computer on the Se7en and which battery module?

more than likely prism II though

Did not know the Prism II had options. Whatever comes with the standard package. Maybe you are thinking of the Explorer?

Green (Rec) battery and standard Paddle on the Se7en.

I dive a Perdix, if that matters.

 

[Akimbo]

Unrelated to the technical merits, I have heard rumors that the fate of the rebreathers has not been determined yet:
Huish Outdoors acquires Oceanic / Hollis - ScubaBoard

 

[tbone1004]

Did not know the Prism II had options. Whatever comes with the standard package. Maybe you are thinking of the Explorer?

Green (Rec) battery and standard Paddle on the Se7en.

I dive a Perdix, if that matters.

it was out pre dive-can, so if it is on divecan, then i would go with the prism over the se7en

 

[guruboy]

it was out pre dive-can, so if it is on divecan, then i would go with the prism over the se7en

poseidon uses CAN, but it might be their own protocol.

I like the idea of their new solid state O2 sensor pod though.

 

[tbone1004]

poseidon uses CAN, but it might be their own protocol.

I like the idea of their new solid state O2 sensor pod though.

divecan is Shearwaters implementation and is trademarked, not a generic canbus. Poseidon, APD, and DiveSoft are using digital versions of rebreather electronics, but I'm not sure which are on an actual canbus vs. other digital architecture.

The CPOD is universal and can go on any rebreather. The cost to upgrade the Se7en is going to be pretyt significant, but is still at least 6 months away if I had to guess. The Se7en is a good ccr, but if you're going to have to spend probably $3k-$4k to upgrade it to the optical sensors, then you're going to be in for quite a bit of money.

The Prism is good to go as is, and the biggest downfall of the Se7en right now is the lack of ability to change setpoints at depth. They love to lock you out for no real apparent reason. Since the prism is running on the DiveCAN it will just tell you you are being a moron and shouldn't dive, but it won't actually stop the unit from functioning, the Se7en's computers can and absolutely will.

The Se7en also uses a cartridge instead of a packable scrubber which is annoying and expensive.

I love Poseidon, and don't like Hollis, that's no secret, but in this case, it's not even a discussion point in my eyes.

 

[guruboy]

If you use the m28 you cant control set point but you can change your OC gas if you switch to a bailout bottle. But I guess that's more money to spend.

I was reading a se7en faq and it will let you keep diving even if you get bent. What other kind of lock out would there be besides failing a system test? Why would you dive if a safety test fails?

Both Prism 2 and Se7en use the same O2 sensor currently.

 

[guruboy]

Read through the se7en manual. Seems to be very rec diving friendly. Minimal user interaction needed. m28 does not seem to add much diving functionality but seems useful on the surface and obviously a better display.

The se7en electronics will need an upgrade to support the SS O2 sensor in place of the two galvanic sensors though. But this is an extra and not a detriment compared to the prism2 which doesn't use the SS sensors yet anyways.

Will read the prism2 manual next.