So - you want a splendid holiday microscope? (II)
As we did already discuss the MBS-10 extensively elsewhere we will concentrate on the entry-level compound microscope sold under the name BTC BIM135T.
There was also a smaller sister model, priced for about 60 US $ less, called "BTC BIM105T". It has no condenser adjustment knob and more modest achromatic objectives (not semi-plan). Overall those prices might still look like a lot of money for most of our readers. But we shouldn't forget that this kind of microscope would have cost about 2,000 US $ in the 1970s.
We were curious whether the optics and mechanics might come
close to our older "branded" microsopes as there are many contradictory
statements about this topic all over the web, for example:
So what ???
Basic use, focusing and light are fully functional and all movements are working (no disturbing backlash, no vibration tendency when focusing etc., no light flickering). The image is quite clear, the field of view not luxurious but appropriate and sufficiently flat. Obviously the design is oriented towards the beginner with no special refinements or complications. Just switch the light on, choose the appropriate objective needed, focus - that's it. The visual image impression is flawlessly, not worth further discussion with respect to practical use. The instrument can be used with almost no contraints for water droplet microscopy and even for use with modest incident light, as might become clear from the images below where the incident light is coming from aside:
Some limitations became apparent when using the microscope for the study of the marine tardigrades. As already mentioned in our last issue the field of view shows an uneven brightness, therefore doesn't look as clean as with our classical microscopes. The so-called "Köhler" illumination as recommended by microscopy priests is not available. As a consequence some light energy is dissipated and the 20W source might appear a little bit too dark in extreme situations. Nevertheless the instrument is quite usable as a holiday microscope. The following photograph might serve as an example to make up your mind:
Summary: this microscope is by no means a high-end scientific microscope but it is well suited for the beginner, also a more ambitious beginner with budget restraints. It can be used for photography as well but it is not as flexible and not as upgradable as the more expensive systems.
© Text, images and video clips by
Martin Mach (firstname.lastname@example.org).