Zeiss phase contrast

[Seb28]

Any body knows the size of inner and outer ring of the ph2 slot in Zeiss phase condenser.?
Thanks

[Adam Long]

At work right now but I could measure it for you tonight.

[Adam Long]

Well that was more effort than I'd hoped. It is too small to measure with a micrometer, and the flip-out lens prevents any of my objectives from focusing. So this is a photo of the image of the ring and micrometer slide (face down on top) from the back focal plane of my PH2 16x Neofluar (note delamination).

Dimensions - ring width 0.43mm direct from micrometer
Inner dia 787 units = 4.41mm
Outer diam 950 units = 5.32mm
Diff = 0.91/2 = 0.45mm
(5mm = 893 units on ruler, 1mm = 178.6 units)
In my experience the Zeiss phase rings are not so precisely matched in size with the plate in the objective, so you can afford to err on the bigger side if printing your own stops.
Photos below if you wish to verify.

Screenshot -PH2.jpg (28.08 KiB) Viewed 1831 times

Screenshot2-PH2.jpg (49.67 KiB) Viewed 1828 times

Screenshot3-PH2.jpg (45.52 KiB) Viewed 1828 times

Edit: Ah the forum software has compressed the second pic. Re-uploaded as two.

[Hobbyst46]

I measured the diameter of the Ph2 ring in the turret phase contrast condenser (Cat. 465277) with calipers and found it 3mm.
This is crude of course.