I would let them go..
If you are in US, go to the local Radio Shack and buy a small microscope, they are around 12 bucks. Then come to the forum and do a search on trichomes, these are the indicators or "is it done yet?"
Looking close at the bud, you will see little balls on sticks with fluid inside, these are the trichomes. The little balls are filled with fluid that begins clear and then turns cloudy as the plant matures and as the progression continues, the little balls liquid turns an amber colour. Many try to find a balance of percentage amber/trichome coulour. I myself go for 20% amber and the rest cloudy.... then I pluck 'em. Only exception is multiple frost days in succesion coming, then I will pull after the second frost but 52 degrees is not anywhere near the panic temp!
Pics can't give a good indicator of the "degree of done" ..
Good luck!
Pete