To maintain a "safe" distance away from the food? (which maybe hot and "fuming")
The 'distance' part is correct, but for the wrong reason.
You'll want a bit of distance from the tripod and set-up, simply because you'll be fussing and adjusting the food and set-up a great deal. A tripod mounted 50mil, to take a pax shot of a single dish - your tripod will be banging into the table-top already.
Then throw in stands, lights, reflectors etc etc etc ... it becomes not only inconvenient, but dangerous as well. :sweat:
TS, given your budget constraints, you'll be hard pressed to find anything more value for money than the Tamron. But bear in mind, Singapore doesn't have more intensive service support for Tamron lenses so anything other than the most minor problem, have to send back to Japan. I assume if the lens is out of warranty, end-user has to pay for the shipping.
One alternative is the Sigma macro lense of similar focal length. Sigma has a service and repair center here in SG.