Pau, I just tried your suggestions. I have been able to get DF with the 10x by using the 0 mark, or BF. I just tried it with the PH3 and that worked also. But I have never gotten a DF or a good oblique effect with the 20x Plan APO or any of my other lenses.
The 0 stop is a BF stop with an iris in it, and I have not tried adjusting that yet. I'll do that later today. It is far too small for me to build a Rheinburg filter for it though, about big enough to stick the tip of your first finger in it. Maybe there is a size of those ready made plastic ones that will fit.
Bug Wings On 55 Year Old Slides
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- Charles Krebs
- Posts: 5865
- Joined: Tue Aug 01, 2006 8:02 pm
- Location: Issaquah, WA USA
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Really nice Mitch. I especially like the pattern butterfly wing scales (#4).
The NA of your 20X Plan Apo is a probably a little too high to get darkfield via a "stop".... you would really need a dedicated darkfield condenser (with the proper specifications) for that one. But you should be able to get very nice oblique with the method Pau described.
The NA of your 20X Plan Apo is a probably a little too high to get darkfield via a "stop".... you would really need a dedicated darkfield condenser (with the proper specifications) for that one. But you should be able to get very nice oblique with the method Pau described.