Search the CONFOCAL archive at
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal

Dear Jim,
 
I'm quite aware of the fact that the sensitivity of the eye dcereases repidly at longer wavelength. Those weak signals of Phalloidin 633 we measured either by using the PMT-s of our Zeiss 510 LSM or by using a cooled CCD camera (we tried a Kappa, and a Till Imago) (in this latter cases of course we used epi-fluorscence illumination either with the help of a laser or a HBO lamp or a Till monochromator) and in all cases the signal stayed weak compared to the shorter wavelength. Of course it is possible that there is a camera which we haven't tried and with which one could see those signals.... However so far we had never problems with visualizing Cy5 signals.
 
Cheers    Gabor