Zeiss ocular projective

[Piter_]

Hi.
I have came across this ocular. Any idea then to use it?
It is over 10 cm long, not sure it will fit in my trinocular head.
Thanks.

[MichaelG.]

With a focal length of 100mm ... I would guess it’s for classroom or theatre screen projection.

MichaelG.

[apochronaut]

Older eyepieces, in a similar fashion to telescope eyepieces were marked by the focal length, rather than the magnification. 1/2", 1" etc. or 12mm, 25mm etc. A 100mm focal length is about 4", so should come out to 2 to 3X, or so, depending on the actual design. It is probably a huygens or modified huygens type. Low mag. huygens types would be excessively long. I think, a simple photo eyepiece.

[75RR]

I imagine that it is similar to the Micpro:
(page is from Zeiss Optical Systems Brochure)

[MichaelG.]

Thanks for page 81

Table 34 would appear to support my hypothesis:
Recommended projection distance = 10m

MichaelG.

[Piter_]

Mine looks like from Zeiss projector.
https://www.google.com/url?sa=t&source= ... oqa3CaYobn
The shiny part is longer.

[Piter_]

Here some mote info on the subject:
https://drive.google.com/open?id=0B2sfo ... lFTlQ5Q2RF

[Dmi3n]

This is Carl Zeiss Jena (ausJena was their brand for selling outside Eastern block countries for some time) eyepiece for projection microscope called Pictoval (you can find some info and pictures on the internet).