>...I will need a dichroic mirror that transmits short wavelengths
    >(excitation) and reflects longer wavelengths (fluorescence).  As far
    >as I can tell the dichroics supplied with conventional microscopes
    >work the other way around. Does anybody out there use, or know of a
    >manufacturer who supplies mirrors that will work in this way?
 
    I think the following company is still in business:
 
    OMEGA Optical Inc.
    3 Grove Street, Box 573
    Brattleboro, Vermont, USA  05301
    (802) 254-2690
 
    The literature I have from them lists Short Pass (SP) as an option for
    the Dichroic Mirror (DM) series. They just need to know the Cut-on/off
    Wavelength (CWL) you require.
 
    Scott Pine
    FDA/Division of Research and Testing
    [log in to unmask]