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Details about  MICROSCOPE OBJECTIVE POL 60X/0.85 infinity corrected

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MICROSCOPE OBJECTIVE POL 60X/0.85 infinity corrected
Item Ended
Item condition:
08 Jan, 2015 08:16:05 GMT
May not post to United States - Read item description or contact seller for postage options. | See details
Item location:
Sudbury, United Kingdom

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Item specifics

New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is ... Read moreabout the condition
CLASS: Unstated - probably Plan Achromatic OPTICAL TUBE TYPE: Infinity
Type: POL - Strain free Glass THREAD TYPE: RMS
Numerical Aperture: 0.85

A 60X Strain Free Glass Polarising Microscope Objective for an Infinity Corrected Polarising Upright Microscope



On offer is high quality 60X POL microscope objective (6001)

Probably from a Prior (UK) compound polarising microscopeThis is a brand new objective from unused stock.

This objective has a standard RMS thread.

Markings on the steel barrel are:


(POL= made with strain free glass suitable for use with transmission polarising microscopes (also works well with biological upright microscopes))


60 = 60X magnification /0.85 indicates the numerical aperture of the objective


infinity =  optical system 'tube length' (very common in current microscopes) / 0.17 = coverglass corrected for 0.17mm thickness of glass


Information about microscope objectives:

There are three basic types of microscope objectives:

Compound microscope objectives

This is the most common type where the microscope typically has a turret of objectives.  Within this type of objective are a host of different sub-types and magnifications, probably there over 4,000 different types of compound microscope objectives.  Examples include objectives for biological microscopes, metallurgical microscopes, phase contrast, fluorescence & polarising. Then there are different grades of optics (in increasing quality): eg achromatic, semi-plan achromatic, plan achromatic, plan apochromatic etc.  There are also different optical tube systems (reference focal length) eg infinity or 160mm.  Finally there are different threads, the most common being RMS thread --- see below for more details.

Stereo/Dissecting Zoom microscope objectives

These are larger, flatter, wider objectives with low magnification powers typically, 0.3X,0.5X,0.7X, 0.75X, 1X, 1.5X, 2X.

Monozoom system objectives

These are specialised objectives that only fit monozoom microscopes, they are typcally very small and flat (thin) and have similar low magnification powers to stereo/dissecting zoom microscope objectives above.

Information about Compound Microscope Objectives:


The most common thread is the RMS (Royal Microscopical Society) standard microscope objective thread 0.8in (20.32mm) in diameter (outside diameter of thread) based on a Whitworth thread pitch of 36 threads per inch.

Meaning of the markings on the microscope objective barrel


Plan  (objective quality grade)

100X oil/1.25 (magnification, whether immersion oil is needed to use it/numerical aperture)

160/0.17 (Optical tube length & compatible optical system in the microscope / coverslip correction indicating the thickness of the coverslip (in mm) that the optics are corrected for)

Numerical Aperture (NA)

The most important, factor in determining the resolution of an objective is the angular aperture, which has a practical upper limit of about 72 degrees (with a sine value of 0.95). When combined with refractive index, the product:


is known as the numerical aperture (abbreviated NA), and provides a convenient indicator of the resolution for any particular objective. Numerical aperture is generally the most important design criteria (other than optical correction) to consider when selecting a microscope objective. Values range from 0.1 for very low magnification objectives (1x to 4x) to as much as 1.6 for high-performance objectives utilizing specialized immersion oils. As numerical aperture values increase for a series of objectives of the same magnification, we generally observe a greater light-gathering ability and increase in resolution.

Objective Quality Grade

The least expensive (and most common) objectives, employed on a majority of laboratory microscopes, are the achromatic objectives. These objectives are corrected for axial chromatic aberration in two wavelengths (blue and red; about 486 and 656 nanometers, respectively), which are brought into a single common focal point. Furthermore, achromatic objectives are corrected for spherical aberration in the color green  The limited correction of achromatic objectives can lead to substantial artifacts when specimens are examined and imaged with color microscopy and photomicrography. If focus is chosen in the green region of the spectrum, images will have a reddish-magenta halo (often termed residual color). Achromatic objectives yield their best results with light passed through a green filter (often an interference filter) and using black and white film when these objectives are employed for photomicrography. The lack of correction for flatness of field (or field curvature) further hampers achromat objectives. In the past few years, most manufacturers have begun providing flat-field corrections for achromat objectives and have given these corrected objectives the name of plan achromats.

The next higher level of correction and cost is found in objectives called fluorites or semi-apochromats (illustrated by center objective in Figure 2), named for the mineral fluorite, which was originally used in their construction. Figure 2 depicts the three major classes of objectives: The achromats with the least amount of correction, as discussed above; the fluorites (or semi-apochromats) that have additional spherical corrections; and, the apochromats that are the most highly corrected objectives available. Although similar in construction to fluorite objectives, the lenses have different curvatures and thickness, and are arranged in a configuration that is unique to apochromat objectives.

Objective Correction for Optical Aberration

Achromat 1 Color 2 Colors No
Plan Achromat 1 Color 2 Colors Yes
Fluorite 2-3 Colors 2-3 Colors No
Plan Fluorite 3-4 Colors 2-4 Colors Yes
Plan Apochromat 3-4 Colors 4-5 Colors Yes

(information courtesy of and Olympus)



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Sometimes systems purchased can be quite complex to test and quality control before dispatch, this can take us a few extra days, especially if we have a large number of these types of systems to deliver. We cannot rush this process so please bear with us, we really will do our best!  Orders received on Wednesday pm and Thursday will be dispatched for delivery on the following Monday with the exception of Bank Holiday Mondays.

Delivery times to

Highlands & Islands of Scotland

Northern Ireland, Isle of Man, Isle of Wight and other Islands

May take 3-4 days longer

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