Re: ATM Microscopes as Eyepieces

[andydtg@alpha1.phoenix.net]

Re:

>1)160 mm is a standard for the _mechanical_ tubelength of a microscope
>  particular defining the spaces from both ends to a focal plane inside 
>  the tube. If well done every "160 mm" type of objective and eyepiece  
>  will work together independent from the manufacturer. This means best
>  possible optical performance and the formula 10x lens and 10x EP =100x 
>  magnification is correct (+/- any percent in practice 8-) ).
>
>2)the focal length of microscope objectives vary by manufacturer.
>  but typicaly a 4x has 30-32mm FL, 10x:FL=16-17mm, 25x:FL=6-8mm and
>  40x:FL=4-5mm.In a microscope the FL is not a point of interrest. 
>  A 40x lense will pusch a 10 micrometer object into a 0.4mm picture in the
>  focal plane.

True for some types of microscope lenses. Other are designed to produce a
collimated beam that can be passed thru a long path with prisms, beamsplitters,
etc & then an infinity corrected lens is used to form the actual image,
whose size is determined by the ratio of the objective/lens focal lengths.
This type would not work well in forming a direc magnified image. Most
recent microscope objectives are of this type.



Andy Saulietis / DTG Alt-Az-Fp Drive Systems
12617 Harriet Ln
Santa Fe, TX 77510 USA
409-925-8854 Voice/Fax