Volltext: Microscopes and Accessories for the Microscope, Carl Zeiss, Jena, 35th Edition

C. Compensating Eyepieces. 
In all microscopes objectives of large apertures the presence of a non- 
achromatic front lens is responsible lor certain inherent colour defects in 
the extra-axial portion of the visual field known as the chromatic 
difference of magnification, as explained in DlPPEL’s „Das Mikroskop“, 
Second Edition, 1, 225—227, Brunswick, 1882; CZÄPSKI, „Theorie der optischen 
Instrumente“, Second Edition, 182, 368, Leipzig 1904. The differently coloured 
constituent images which blend into the resultant image are of different magni¬ 
tudes, the blue being larger than the red. Rn image projected by an objective 
of this kind without eyepiece or when viewed through an eyepiece of the usual 
type will exhibit colour fringes which increase in intensity towards the margin. 
This residual defect of lenses of large aperture is shared by the apochro- 
matic lenses, and, in order that it may be possible to correct it more or less 
completely by a specially devised series of eyepieces it has been intro¬ 
duced intentionally in a similar degree in the lower powers as well. To compen¬ 
sate this defect, eyepieces have been computed having a defect equal in magni¬ 
tude and opposite in kind to that inherent in, or intentionally imparted to, 
the objectives, so that the red image formed by them is larger than the blue 
image. These eyepieces serve accordingly to compensate the imperfection due 
to the chromatic difference of magnification referred to and when viewed through 
them the images are uniformly colourless up to the edge of the diaphragm 
in the eyepiece by which the field of view is bounded. Being itself under¬ 
corrected the eyepiece shows the edge of the diaphragm as such bordered by a 
reddish or yellowish fringe. 
Eyepiece No. 
6 8 
Fig. 5. 
Compensating Eyepieces 
(£ Full Size) 
A A is the plane of the upper rim of the drawtube 
of the microscope. 


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