Home page of the microscope service parts, repair and spare parts online catalog - Sermik-Oplatek Mikroskopservice Dresden f.n.n.Z

Description of this part for the microscope.

N Plan 40x/0.65 ∞/0.17
Magnification: 40x
Correction: PLAN achromatic
Optical system: CCIS (Color Corrected Infinity System - part of the image correction is performed by the tube lens of the Motic stand, which is why the objective is intended for stands of this brand)
Numerical aperture N.A.: 0.65
Working distance W.D.: approx. 0.4-0.5 mm
Tube length: infinity
Parfocal distance: 45 mm
Field number F.N.: 20
Cover glass: yes, 0.17 mm thick
Immersion: no (this is a dry objective)
Thread: RMS
Spring-loaded mount: yes - the front mount retracts when pressed against the specimen, which at a working distance of about half a millimetre saves both the objective and the cover glass
Lead-free glass: yes - the mount carries the crossed-out Pb symbol
Colour ring: blue, according to the colour code for 40x magnification

Objectives of the EF-N Plan series were the factory equipment of the older generation of the Motic BA210 and BA310 microscopes, while the newer models of these series, designated Elite (BA210E, BA310E), are fitted with the next-generation EC Plan objectives - this objective is therefore the correct spare part for the older stands and not for the Elite versions.

Mechanically this objective can be screwed into the nosepiece of many other microscopes, since the RMS thread and the 45 mm parfocal distance are standard - a correct image, however, cannot be obtained that way.
- in older stands corrected for 160 mm it will not work, because it is an infinity-corrected objective and requires a tube lens
- in stands of other manufacturers, including infinity-corrected ones, a residual aberration remains, because part of the correction is performed by the tube lens of the CCIS system, which is built into the stand of the Motic microscope and matched by the manufacturer to exactly this optics
- in the remaining Motic microscopes with the CCIS system the objective does produce an image, but it is not the factory choice for them - in stands with field number 22 it runs out of field, and in inverted stands it runs out of working distance.

Description of this part for the microscope.

25 160/0.17
Magnification: 10x
Numerical aperture N.A.: 0.25
Tube length: 160 mm
Parfocal length: 45 mm
Cover glass: according to the engraving on the barrel 0.17 mm, but with 10x objectives a cover glass is in practice not required - the objective works both with and without one
Immersion: no (this is a dry objective)
Thread: RMS

I have personally tested this objective with the following microscopes:
- MOTIC B1
- MOTIC SFC-100
- PZO Studar
- Carl Zeiss Jena Ergaval
- Olympus CH

This MOTIC microscope objective will work well in a microscope from any manufacturer, provided it has an RMS thread, optics corrected for a 160 mm tube length and accepts objectives with a 45 mm parfocal length. As for the parfocal length: in the vast majority of cases (almost always) objectives with a 45 mm parfocal length can also be fitted to microscopes originally sold with so-called short barrel objectives, that is with a 33 mm or 37 mm parfocal length. In such a case it is more convenient not to mix the objectives and to have them all of the same length - but that is only a matter of convenience, not a requirement. In the compatibility section I do not list microscopes from other manufacturers, because that list would need several hundred entries.

This also works the other way round: in the MOTIC B1 and MOTIC SFC-100 microscopes you can use any objective with an RMS thread, corrected for a 160 mm tube length and with a 45 mm parfocal length - from any manufacturer. These can be unbranded objectives, PZO or Carl Zeiss Jena objectives - but the objective offered here will please those who own a MOTIC microscope and want to complete it with original parts.