Reichert MeF2 lenses

Discussion in 'Abstract, Still Life, Specialist and Macro' started by Witold Janik, Nov 20, 2022.

  1. Witold Janik

    Witold Janik New Member

    I did recently a focus stacking, with quite good results. I will show some results but first I have to publish an article. What kind of lenses could be used with this microscope? As far I understand the focal length of it is 250, so I can't use typical 160mm, but can I use ones mareked with infinity?

    BR to everyone
     
  2. Pete Askew

    Pete Askew Admin

    Infinity objectives certainly will not focus. Objectives designed for a tube length of 160 mm will probably suffer from quite a bit of spherical aberration, but will produce an image I would think. If it were the other way round you could build in a tube extension. I did a quick experiment though to see what impact tube length had on the image.

    This is an image of a stage micrometer (10 ┬Ám su-divisions) taken using a 10/0.24 PZO objective designed for a 160 mm tube length (borrowed from the phase contrast set on a Wild M20). As you can see, there is no spherical aberration or significant colour fringing. There is a slight hint of birefringence, but that is probably because I did not want to disturb the DIC setup. So at this magnification at least using a 160 mm tube length objective on the MeF2 worked Okay.

    MeF2 160 TL-1.jpg
     
  3. Pete Askew

    Pete Askew Admin

    The birefringence was bugging me and so I removed the DIC unit and re-took the image (note the magnification will be 1.25 X less due to that). Birefringence has gone and so it was due to the polarisers in the DIC unit.

    MeF2 160 TL-2.jpg
     

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