A mysterious field microscope - the Chinese TWX-1 (IV)
In the last issue we demonstrated that the 45x/N.A. 0.63 objective of the TWX-1
is well able to resolve the fine structure ("lines") of the test diatom Pleurosigma angulatum.
This implies that its resolution is roughly comparable to the standard objectives found on larger microscopes.
Furthermore we were able to make plausible by means of a diatom circle specimen
that the overall image quality of the 10x objective will work well for most field applications -
though the field ov view is slightly curved.
As the third remaining objective on the TWX-1 we have a 90x/N.A. 1.25 oil immersion.
For tardigrade viewing we will need this type of objective only rarely. Nevertheless,
for the sake of completeness, we will show here how it is performing on the respective test diatoms.
As has been mentioned already in a former issue the faint dots of the test diatom
Navicula lyra normally cannot be resolved by the 10x objective.
In contrast, this structure is no challenge for oil immersion objectives. As a consequence
also the TWX-1 90x objective reveals impressive resolution down to the dots:
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