Re: Infinity spaces in Wild M5?

2nd. Even if it's not infinity corrected...
Why do you need infinity correction? I am using a ccd on an old Leica
which is not infinity...
With any resonable digital camera you can control the focus from the
display or - even better- from a PC-monitor.
With CCD-cameras this is standard anyway.
All you need is a tubus of the right length, this length can be
estimated by hand:
Focus a specimen, remove the head of the bino, hold a paper in the
light-beam until focus and measure the distance. This is where your
chip should be with your new fototubus.
3rd. We have got newer Wild equipped with a third ocular for teaching.
We just hold a digital camera on top of the 10x ocular and can take
photos. We even have had a plastc-ring made where the camara-objective
fits perfect and the camera will not fall down. Only disadvantage is,
that the chip of the camera will not be illuminated in the edges. Here
a 2.5x lens directly in front of the camera could be helpful.
So I think you can take pictures directly from the ocular
or when removing the ocular and replacing the tubus with a shorter
tubus.

Thanks for the advice! I definitely don't need infinity optics, but I
did want to figure out what kind of optics I had. I'm looking into
reasonably-sensitive scientific CCD cameras (in the $1-2k range,
nothing outlandish) to capture the images from fluorescence
excitation, and since these are usually designed for fixed-focus C-
mount systems, figuring out the right tube length is important.

It's easy for me to grok the simplest-possible infinity set-up: you
put the CCD plane at the focal plane of the tube lens, and then you
stick the tube lens in the collimated light path. For the fixed-length
system, how does it work? You put the intermediate image plane (what
you find with the paper method, e.g.) at one focal plane of the relay
lens, and then the CCD at the other focal plane?

Thanks again for the help and suggestions. The gulf between
understanding how a microscope works and then understanding it enough
to build even simple modifications to it is pretty large!

Zach
.

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