Longimanus,
congratulations for your D7000 rig, a excellent choice!
The answers below reflect MY way of doing it because my experience and knowledge let me think that they are right,
other people will have other meanings about.
How often do you clean your o rings?
every time i close the housing i pass with my clean finger over it to feel/eliminate eventual sand/salt grains, hairs/lint, etc.
regreasing and cleaning when they are dirty on flat compression o-ring (Housing), regreasing and cleaning on twisted o-ring (battery tray of torches or strobes) approx every 5th use or when they are dry.
O-rings getting squeezed by a turning movement need the grease to reduce friction to avoid that they get twisted
What tools do you travel with?
a small box with the allen wrenches for my Hugyfot housing and spare grease and o-rings
depend where you go, if i would do a photo liveaboard i would stock up my tool and spare part box.
Do you always have your housing passed to you or do you jump in with it?
Jumping with the hosing is probably the second best was to flood a housing.
The best is leaving the camera in the rinse tank wit other cameras or trapping something between the o-ring
I personally consider the risk lower from handing the camera than jumping with it
Do I need any desiccant in my housing?
I don't use desiccants in the camera housing and don't have problems with fogging.
In humid places i flill the housing with dry air from a scuba tank or close the housing in the A/C'd room.
if you should experience problems with fogging follow the steps above, if problems persist use desiccants but be very careful to
not trap them between the seals.
Fogging occurs only when the difference between the inside and outside reach a certain point (dew point) and it usually happen when:
a) humid air inside housing (fill it with dry air or close it in a A/C'd room
b) Heat build-up inside the housing ( cover the camera with a towel or leave it in a personal bucket of sea water) and switch the camera off if not used
c) if the water temperature is colder than 22°C/70°F the risk of fogging rises with medium/high air humidity
Can I travel with my camera in the housing?
Yes you can, but i would NOT doing during long/er (airline) travels with the camera inside the housing as:
i use the camera during the travel - something can become loose inside - the housing can fall and its more heavy - etc.
I prepare the camera a home and carry it in the car inside a hard cooler and wrapped in a big, fluffy towel to the harbor.
Do you have a specific setting for your camera when getting in the water, just in case something is there straight away?
I do a full reset before i use the camera to be sure there are no counterproductive settings in memory and change and adapt the settings to
the current dive conditions. I use sometimes and in stable dive conditions the user settings on my Canon G12.
Check and recheck the functions of you camera before you close the housing and after again, the three famous errors are:
1° leaving the lens cap on the lens
2° the lever for AF/MF on tle left lower side is not in the right position so you can't switch back to AF if the cameras lever is in MF
3° The lens is in MF mode, especially the Tokinas lenses are prone to change to MF unintentional during assembling the housing
4° recheck all o-rings, especially the twisted, i just flooded my old D2000 as i snatched the o-ring in the tread and did not do a predive-check
General hints:
After i made the errors above (do i hear laughter coming from somewhere ...) i take a few test picture with the strobes firing immediately
after i assembled the rig to see if everything is working as supposed.
Take your camera to the pool to become comfortable with it, build a scene from a old big ceramic tile with glues on plastic animals as object,
this arrangement will help you to get comfortable with the camera, the controls and their functions.
Don't forget to have FUN!
Chris
P.S. Some more thoughts:
1° transporting your camera: i use a hard sided cooler with ONLY the camera inside. The camera is wrapped in a fluffy big towel for protection
2° use a cooler/box with a lid, you will always find somebody who put something inside the box and above the camera
3° Be very very careful with acrylic dome ports, i had somebody dropped a wet towel above my camera and the weight of it with the vibrations from the boat scratched the dome with the glue remains of the dome port "protection" cap made of neoprene. Check your cap for traces of glue!
4° I plaited from a thin nylon rope a thick handle with 2 snap hooks on both ends snap to the ULCS arms to have a handle for the heavy rig.
This makes long walks more comfortable and provide a handle for the boat crew handing the camera, while diving i clip it on my BCD