Optovar Magnification Changer

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microb
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Optovar Magnification Changer

#1 Post by microb » Tue Jul 14, 2020 7:45 am

Does anyone have pointers to the lens assembly design of a Optovar Magnification Changer? What lenses are used to get 1.25x 2.x and so on?

I'm assuming they two doublets: planer convex and a planar convex making a Galilean telescope: http://electron9.phys.utk.edu/optics421 ... scopes.htm

http://www.microscopy-uk.org.uk/mag/ind ... tovar.html
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microb
Posts: 729
Joined: Wed Mar 27, 2019 6:39 am

Re: Optovar Magnification Changer

#2 Post by microb » Wed Jul 15, 2020 4:56 am

So if I take a 56.79 BFL and a -51.58, put them together in a Galilean telescope, it becomes clear that to get much magnification the focal lengths need a bigger difference.
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tooclose1.png
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Last edited by microb on Wed Jul 15, 2020 8:34 am, edited 1 time in total.
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microb
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Re: Optovar Magnification Changer

#3 Post by microb » Wed Jul 15, 2020 8:17 am

So FL 56.79 paired with FL -18.08:
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FL56.79_FL-18.08.PNG
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