Oak leaf and ice patterns in frozen pond.

Oak leaf and ice patterns in frozen pond. Chobham Common NNR, Surrey. UK Canon EOS1dMKII, 90mm TSE + 1.4TC tilted, f11, 3.2 sec, tripod, MLU, cable, polariser. Converted RSP, levels, dust etc. PSE3. Looking for leaves in the frozen pond, I came across this one and got a surprise when I turned the polariser - the ice bubble turned into a colourful spectrum depending on the position of the filter. Although I used the 70-200 zoom at first, I wasn't convinced I was getting the best DOF available, so switched to the 90 TSE and added the 1.4 converter to pull the leaf in closer.