Re: What Kind of Eyepiece


"Tom Hubin" <thubin@xxxxxxxxxxxxx> wrote in message
news:44EA1696.2EB6@xxxxxxxxxxxxxxxx
Hello,

I have a well illuminated 16mm diameter flat colored object inside a
container and located 30mm from a 5mm diameter viewing port.

I need to view the object with an eyepiece, or collection of air-spaced
lenses, that provide a reasonable eye relief for eyeglass wearers. Let's
say 15mm to 20mm eye relief and a 5mm to 10mm exit pupil and something
close to a 30 degree full field of view.

Resolution on the order of 1% of the object diameter is adequate.

The location and size of the viewing port seems incompatible with the
eyepiece specs that I have looked at. I need to know the class of
eyepiece lens or optics to look for. If I can find a commercial lens
that is close then I can alter some of my parameters to better fit the
lens.


Tom, this is not a standard eyepiece application, so a standard eyepiece
won't work well. An eyepiece is designed for a system with the aperture
stop far from the eyepiece, with the object near the eyepiece. At first
blush, you have the aperture stop between the object and the "eyepiece".
This is more akin to a door peephole viewer than to an eyepiece.

My suggestion is that you get a competent optical designer to spend some
quality time with your problem. The quality time would start by inquiring
very closely into how much light is actually needed in the viewed image and
comparing that with how much light is actually available and also whether it
is possible to insert something a considerable distance into the viewing
port.


.

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