Hello,l am looking for a 460ex color and a have some questionsActualy, l use a canon t2i unfiltered.My questions are: 1 is the 460ex will be better than my t2iWhile the answer is subjective, I believe the answer is YES!2 what are the the Quantum Efficiency.I believe it is 77% at the peak. This is from the Starlight Xpress website for the H694C which uses the same Sony sensor:Very high sensitivity - 77% QE at peak of response in yellow light, 65% at Hydrogen alpha line (656 nM).ThanksYou're welcome! --Rob