Nikon TIRF Instructions Manual page 16

I Name and Function of Each Part
3 TIRF attachment
(6) Specimen cover
Illustration of the specimen cover
(6) Specimen cover
This cover employs a filter that can attenuate the intensity of light in the proximity of 488 nm and
523 nm wavelengths by a factor of up to 1000. Make sure that the cover is always in place,
except when you are adjusting the laser focal point.
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