Just like the question states, I'm looking for a monochromator (or more precisely a polychromator) that is meant to be attached to an EM-CCD camera for use in fluorescence microscopes. The way it works is that there's a knob that inserts a slit, and another knobs that switches between a mirror (imaging) and grating (spectrograph), allowing switching between a spectrograph and imaging observed by the CCD camera.

It's something like this:

https://www.bunkoukeiki.co.jp/polychro-clp-50.html

My lab owns this one, but it has a very small field of view in the imaging mode for a wide-field fluorescence microscopy. It also has a freely variable slit, which becomes problematic when I want to measure single-molecule fluorescence spectrum with the same spectral resolution between different positions. Their older models were better in that sense (it had large field of view, and there were several preset slit sizes) but they are no longer manufactured.

I'm wondering if your lab happen to use one, what manufacturer+model are you using?

Note: Yes, I have considered using a transmitting grating to split an image into real space image (zeroth order) and spectral image (first order). However, it obviously sacrifices spectral resolution and intensity. Also, it's inapplicable for relatively larger samples (samples larger than diffraction limit). I am not planning to use a confocal microscopy neither, which omits the option of using adedicated spectrometer.

(edited for terrible grammar)