Slide-on hoods tend to restrict full access to the MacBookPro keyboard.
I like the idea of a Seaport Digital case
with external battery and firewire bus-powered hard drive
mounted on the underside of the lid or on the interior side panels,
allowing for the whole kit to open & close quickly.
http://www.seaportdigital.com/ivisor-pro-p-34.html
The case would need to be attached somehow via quick release to a tripod
http://www.bhphotovideo.com/c/product/2411...se_Adapter.html
or http://www.bhphotovideo.com/c/product/5541...ck_Release.html
Then, hang a camera bag on the tripod to increase stability.
A [view camera] darkcloth draped over the top would allow for more critical viewing.
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We use a laptop sheilded with a 8x10 type bellows that is made in England, I think it's from Chatham.
It works pretty well, though not perfectly, though after trying about everything, nothing really works perfectly on bright beach other than a huge blackout tent.
The bellows doesn't block the keyboard but it does restrict acess to the mac dock so the dock must be moved to the side.
All of this is mounted on a plexiglass base and tripod and has worked well with only one issue when an assistant didn't lock a leg down and it tumbled down a hill.
As far as battery power I have a large digital camera battery, but when using the Aptus, like Andre said if the power gets much below 70% to 60% the connection gets flaky.
As Leaf improves their product the two issues they really need to address is the ability to power the back from a seperate battery, because the battery goes into the same space as the firewire port. This would allow for more stable firewire conection shooting.
They also need to allow the camera lcd to operate when tethered. This can be a lifesaver under pressure to not have to continually check the computer.
I found the battery consumption of the Aptus quite high, but I assume it's because of the large screen, though I don't know this as fact, though once I went to the phase even the battery drain on the Contax improved, tethered and portable.
We run a Honda generator (actually 2) whenever possible, even on powered locations.
The Honda is probably the best investment anyone can make, though as the op said running a generator on an LA beach draws a lot of attention and depending on the jurisdiction, the lifegaurds can shut you down.
Of course all of this tethering on a difficult location would be unnecssary a lot of the time if someone would make a back tether to an i-pod touch or an i-phone.
JR