Oblique illumination condenser LOMO ON 14. New toy!

[smollerthings]

Thanks Leitzcycler!

So I cleaned the baby, took out the old grease. Everything is clean and smooth now.



My first video with that shiny new toy. You can hear me being amazed below:



I found the manual of the condenser here: http://science-info.net/docs/Lomo/Lomo_ ... ondser.pdf

It says in there: When operating with high power objective (from 20x and greater) use a condenser, the aperture of which is 1.4 and when operating with magnifications from 10x and less, use the condenser with an aperture A=0.3.

However, on the condenser, the aperture ring goes from 30 to 6, 30 being the most open position. What does this correspond to?

[MichaelG.]

You need to read those instructions a little more carefully, Greg

The short paragraph at the top of p5 explains
... it's “either/or” not an adjustment.

MichaelG.

[Leitzcycler]

Unfortunately that lens was missing.

[MichaelG.]

Still a very useful bit of kit

MichaelG.

[Leitzcycler]

However, on the condenser, the aperture ring goes from 30 to 6, 30 being the most open position. What does this correspond to?

That question is still open. Some condenser aperture rings has marking around 6 to 30 and some e.g. 0.2 to 1.4, the latter corresponding the actual aperture. I have wondered the same question.

[smollerthings]

That question is still open. Some condenser aperture rings has marking around 6 to 30 and some e.g. 0.2 to 1.4, the latter corresponding the actual aperture. I have wondered the same question.

I wonder if that could be magnification? 30 is wide open, 6 is the min aperture.

[MichaelG.]

That question is still open. Some condenser aperture rings has marking around 6 to 30 and some e.g. 0.2 to 1.4, the latter corresponding the actual aperture. I have wondered the same question.

I wonder if that could be magnification? 30 is wide open, 6 is the min aperture.

.

That does seem to be the case … It’s a direct measure of the aperture diameter in millimetres.

MichaelG.

[Leitzcycler]

direct measure of the aperture diameter in millimetres

For what do you actually need that information? The scale telling the real aperture would be much more informative? Although I never use that either. Just turn it so that the image looks good

What I find bizarre there is no mention about that scale in microscope manuals I have. Also I have two condensers for Olympus FH: Abbe with 6 to 30 scale and aplanat achromat with real aperture scale from 0.2 to 1.4. Is the abbe scale for dummies and the apl achr scale for professionals? However, I think my Orthoplan also has the mm scale...

[MichaelG.]

direct measure of the aperture diameter in millimetres

For what do you actually need that information? …

So far as I can tell, I don’t

I suppose it gives you something to write down if you want to keep a record

… I didn’t design it, so I can only guess

MichaelG.

[smollerthings]

Well, if no one bothers with those, I am not going to worry either

[Lomonaut]

Congratulations with your aplanatic condenser!
I remember seeing it in the brochures, that side screw was fascinating. Nice to see one in action.