Re: micropscop objective and telecentricity

I'm afraid I need some clarification of terms.

I am talking about using an infinity-corrected objective to scan a
laser across a sample, so the collimated scanning laser beam is going
into the back aperture of the objective. My question is therefore where
to locate the scan pivot. It seems that conventionally this is located
at the back aperture (which I think is also the back focal plane of the
objective (front and back are easily confused here---I mean the focal
plane for collimated light entering the "sample end" of the
objective)).

You have written that the scan pivot should be at the apterture stop,
which I thought you said was the back aperture (clearly for an
collimated beam the aperture can be stopped at an arbitrary location).
However, I understand "exit pupil" to be the Fourier plane of the front
focal plane (f.f.p. = the sample plane), which is at infinity. So
should the scan pivot be at the aperture stop (back aperture) or the
exit pupil (infinity)? If the latter, then I see the need for an
eyepiece (or perhaps field lens). However, surely this is equivalent to
scanning at the back aperture?

Thanks.

Brett

.

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