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If direct fitting is undesirable, or you wish to use two different objectives on a regular basis, then two forms of
objective-changer are available – one manual (see below) and one motorised (see separate section 3.4
Above-stage variant with Motorised Objective Changer (MOC) covering the MOC variant).
3.2.3 Direct objective attachment
The under-side of the optical block presents a hole with an M32 X 0.75 metric thread which is directly
compatible with some large microscope objectives: simply screw the objective into this hole until the shoulder
of the objective meets the underside of the optical block.
If the objective has a different thread, screw one of the supplied adapters into the optics block before attaching
the objective.
Adapters are provided which can accept the following objective threads:
M27 X 0.75
M25 X 0.75
RMS short and long adapters – the long adapter places an RMS-thread objective 30 mm below the
nominal mounting position which can be useful for maintaining par-focality with some larger objectives.
The entire optical block should be raised up to the maximum possible extent before unscrewing the objective
(using the motorised focusing mechanism). The objective’s nose will drop by the thread depth (typically 5 mm) before it can be
withdrawn, so be careful to ensure that there is sufficient clearance around the sample holder.
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