I want to use the dual-wavelength method to measure Ca2+ with Fura2 in
my cells. The cells are loading nicely - the filter settings look
allright. I tried to add a lot of Fura2 and then some CaCl2 and I got
bright fluorescence at both wavelengths (seen through the eyepieces).
However I can't see any signal via the software on wavelenght 1
(=340nm).
Wavelenght 2 (=380nm) is clearly visuable in the analog settings -
any suggestions !!
