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Check that the filter cube has been pushed fully onto the carrier as described above.
Post the filter cube carrier squarely into the opening so that the dovetail on the under-side of the carrier
engages with the groove in the floor of the optical block. Push the assembly home gently and smoothly
until the rear surface is flush with the side of the casing.
Close the door and tighten the knurled screw until the door sits hard against the side of the optical
block, compressing the O-ring seal to prevent the entry of stray light.
3.6.4 Extraction of the filter cube and carrier
Unscrew the knurled screw on the filter cavity door and open the door fully (be careful not to lose the
white plastic retaining washer on the screw).
The carrier can be withdrawn from the optical block by pulling gently and squarely on the carrier: using
a finger nail on the small spring strip is a convenient method.
Close the compartment door and secure it afterwards to prevent the ingress of dirt and dust and to
keep the detectors in the dark.
Cautions
It is important that the door is closed tightly: this prevents light leakage and also inactivates the
electrical interlock that prevents the detectors from being turned on.
The detection system is normally supplied with a red-sensitive detector module at the rear, and a blue-
green sensitive module at the side. This is compatible with the action of most dichroic mirrors which
tend to reflect shorter wavelengths and transmit longer wavelengths. If your dichroic mirror acts in the
opposite sense it may be necessary to re-position the detector modules (see appendix).
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