EXTREMELY RARE - MINIATURE 40X MICROSCOPE OBJECTIVE, PROBABLY FROM A McARTHUR MICROSCOPE  (ID214)

This objective is from Prior, a UK microscope factory that ceased production of microscopes a few years ago. 

I have a box of these, I think they are from the portable McArthur microscope which ceased production in the 1980s.  It looks like these were made by Olympus.  I cannot be certain of either of these points.

They are certainly very much smaller than normal objectives and I have no idea what tube length optical system they would fit.  They have a thread which is much smaller than RMS.

Manufacture

Flat-Field Correction

Magnification

Tube Length

Objective Type

Nosepiece Mounting Thread

Prior probably

?

40X

?

Brightfield probably

special miniature


These are the dimensions as accurately as I can measure:
  • Total Length including thread: 40mm
  • Length of threaded part: 5mm
  • Length of main straight sided barrel: 30mm
  • Diameter of barrel: 16mm
  • Diameter of aperture at end through which you can see the lens: 4mm
  • Identifying ring: Blue
  • Inner Core: Appears to be brass
  • Diameter of thread: 14mm
It is not possible for us to test the objective so I am assuming that it has all the glass elements inside and I assume it works, it certainly looks complete but no guarantees nor refunds I'm afraid it is bought as seen.

The objectives are immaculately encapsulated in plastic, they look like final production items.

From what I have seen of McArthur objectives this may be the inside 'core' over which a polished steel 'sleeve' is placed presumably decorative only.

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