Ok the think to remember about tripods is, don’t turn them into monopods ! So don’t go for one with an extendable centre column. The next ting to consider is the tripod head, cheep tripods will come with an attached head, more expensive ones will not, so you will have to pay more. Try to get a tripod that you can hang a heavy weight (like your bag) underneath this will help stabilize even a cheep tripod. Oh and lastly don’t leave them unattended on a windy day

Alistair

PS Another consideration over and above a cable release, is to use mirror lock of your camera has this function