Re: Correction collar not working

Is the correction collar for compemsating for difference in coverslip thickness?
Or somthing else, like different mounting media? One easy way to see the effect
of correction collar is to measure the PSF. I would say it's a lens with good
design since the correction collar is not shifting the focus.

What are you expecting the correction collar to do??
How are you evaluating the image "quality"?

My suggestion is the measure coverslip thickness and use that value to set the
correction collar, then measure the PSF (assuming that the correction collar is
for the compensating the coverslip thickness variation).

Good luck!

Satoru

NoSpam <NoSpam@xxxxxxxxxxx> wrote:
Dear Group,

Today I have a question regarding a mechanical-optical malfunction of
a microscope objective made by a major manufacturer.

The objective is a 40x, Plan Apo with correction collar.

Focussing on a slide one obtains a relatively good image, not as good
as one would expect, but acceptably good. What is curious is that ro-
tating the correction collar throughout its range produces no change in
focus.

An explanation on what might be going on?

Thank you
G.R.


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