Leica DM IRB manual Performance data of eyepieces, Decisive value is always the smallest

Performance data of eyepieces

Leica eyepiece	Magnification/	Eyepiece port +)
type	fov
HC PLAN	10x/20	M
HC PLAN	10x/20
HC PLAN	12.5x/16	M
HC PLAN	10x/20	MF
HC PLAN	10x/22	M
HC PLAN	11x/20	MF

Eyepiece tube diameter: 30 mm

+)	= With removable or push-back anti-glare protection
	for use with or without eyeglasses.

M= Ajustable eyelens (dioptre compensation) and slot for graticules of 26 mm diameter.

MF = With illuminated graticule.

The LEITZ PERIPLAN® eyepiece type may not be used! Earlier L PLAN type eypieces may only be used with earlier type tubes (before about 1988) without the HC engraving!

The maximum eyepiece field of view of a specific configuration is derived from the following microscope data:

Field performance of the objectives Field performance of the intermediate module(s)

Tube field number Condenser properties

The decisive value is always the smallest.

For example, if the intermediate modules only permit a field of view of 20 mm, but the objectives and tube 25 mm, only eyepieces up to fov 20 can be used. Eyepieces with fov 25 can lead to vignetting in this case.

Eyepiece field of view

Each microscope configuration has a certain eyepiece field of view (see below), e. g. 20, which must not be exceeded. If the maximum fov is exceeded there may be disturbing loss of definition and/or vignetting at the edge of the image, → following pages!

The eyepiece field of view (fov) designates the diameter of the intermediate image in the eyepiece in mm, i.e. the diameter of the circular diaphragm that frames the image and that lies inside the eyepiece. This fov is specified on the eyepiece after the magnification, e. g. 10x/20.

For the Leica DM IRB microscope we recom- mend fov 22.

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The diameter of the viewable specimen area is calculated by dividing the diameter of the field of view by the magnification of the objective and the magnification factor of the microscope optics.

Example: Eyepiece 10x/20 Objective PLAN 4/0.10

Magnification factor of the Leica DM IRB Microscope optics 1x

Viewable specimen area

20 mm

––––––––– = Ø 5 mm 4 x 1

The total magnification of the microscope is worked out by multiplying the eyepiece mag- nification with the reproduction ratio of the objective and the magnification factor of the microscope optics.