do's and don'ts to cemetery photography

Take a strong flashlight... use it to shine across the stones, (not directly at stone) ... this will "raise" shadows to read those that are worn away by time.
Take a very soft broom/brush... helps sweep off dirt / debris / bird droppings.
Take a squirt bottle of water... sometimes darkening / wetting the stone makes it easier to read.
Take a digital camera with "many pixels"... this allows you to zoom in and adjust colors / brightness which sometimes helps.
Take Pelon (fabric interface from any fabric store) or large sheets of newsprint paper... to do rubbings if stone is in "safe" condition.. never try to do a rubbing on a stone that is disintegrating. You will also need special crayons / charcoal for the rubbings if you choose to do this.
Take small hand clippers... to trim away overgrown vegetation.
Take gloves to clear vines, dirt, sticks, pricky thorns.
Take bug spray and some bandaids when you do get a thorn in your thumb.
Make sure it is ok with the cemetery to take photos.. on a rare occasion, it will be a private property / need permission to enter.
Make sure you take all angles and sides of stone. Many times names are also on the back and sides of the stones... (4 sides, 4 names etc)
Be sure to photograph the memorials / markers for veterans (there are different ones for different wars.. a bit of history there)
Take a notepad to make notes ... if repairs need to be done, broken granite around "plate", leaning, missing vase, etc. Then report to cemetery "owner/office"
Take knee pads / towel to kneel on.
Take a ziplock / small bag to collect trash / paper/ broken glass... then dispose of.
Take container of baby wipes for your hands / face / and sometimes photos or images on stone that need a touch up of cleaning.
Take a map of the cemetery - showing plots / areas / landmarks.
Make sure you take "surrounding photos" of the graves... so you can share / show that Auntie Em is by the huge pine tree, near the water spigot, across the road from the Veterans memorial...
Always leave the cemetery in better shape than when you arrived. Never leave a mess.