Hi all,
Condensers are still very mysterious to me. I have been advised to leave them up, and I have done that with good results. However, I have noticed some condensers have lower mechanical positions compared to other. Some go up to the slide (Lomo for ex), some lie 2-3 mm below (Karl Kaps, phase contrast condenser).
Is there any reason for this difference in design?
Thanks!
Condenser positionning
Re: Condenser positionning
The condenser has to create a conical light beam. The bigger the included angle the more resolution is possible, high numeric aperture. Above n.a. 0,95 immersion is necessary. To use oil the gap has to be narrow. For a dry condenser below this n.a. the distance can vary, depending on the lens diameter. Your phase condenser is probably a n.a 0,9 dry condenser - right?
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Re: Condenser positionning
Thanks for the explanation.
Nothing is written on the condenser but I think it is likely to be 0.9 dry.
Nothing is written on the condenser but I think it is likely to be 0.9 dry.