Talk:Köhler illumination

Creation
I created this article...I plan to add more referances and elaborate on the technique...if anybody has input I would love to hear it & I hope people add their own edits Coolbrdr 09:15, 15 May 2007 (UTC)

Suggestions
Thanks. A diagram would be great to explain/show. Rod57 15:03, 1 June 2007 (UTC)

Telecentric ?
I have seen some suggestions that microscope objectives and condensers are generally telecentric. Can anyone here confirm or deny that? Please update that talk page or article. Thanks. --195.137.93.171 (talk) 07:13, 8 March 2008 (UTC)

For an optical system to be telecentric, the chief-rays of all ray-bundles must be parallel to the optic axis. That is clearly not so in microscope optics. — Preceding unsigned comment added by 180.20.8.1 (talk) 02:28, 23 October 2014 (UTC)

Nuclearnova
I'm doing a project on this in class now, a diagram would be great for future students if anyone has one or could make one! —Preceding unsigned comment added by Jakeleveto (talk • contribs) 15:43, 6 November 2008 (UTC)

Advantages
'By adjustment of the field diaphragm the amount of light entering the sample can be freely adjusted without altering the wavelengths of light present, in contrast to reducing power to the light source with critical illumination.' - These two techniques are not comparable. Reducing the field diaphragm reduces the field of illumination but does nothing to change the intensity of the illumination. In Koehler illumination the intensity of the illumination may be changed either by changing the power to the light source (thus changing the temperature of the light generated by the source) or by inserting neutral density filter into the light path, usually in the collimated beam between the collector lens and the field diaphragm. — Preceding unsigned comment added by 130.102.115.129 (talk) 01:11, 29 June 2011 (UTC)

diagram
This image was removed from the article in 2017. It may not be perfect, but for the lack of a better one should it not be put back in again? Dietzel65 (talk) 21:58, 21 July 2018 (UTC)
 * I take that back. Now there is an alternative, File:Kohler Illumination en.svg. Dietzel65 (talk) 20:25, 23 July 2018 (UTC)

The “Optical Principles” section needs clarification
I have a decent layperson’s understanding of optics and I find this section pretty nearly 100% opaque. (I suppose a background in optics helps one recognize opacity, but that’s a separate topic.) Part of the confusion is that this section continues the discussion of critical versus Kohler illumination from the previous section, which is confusing in itself. What’s going on in the ray-tracing diagram is not clear at all. It doesn’t help to talk about conjugate planes when the reader is unlikely to know what a conjugate plane is; the text becomes mere jargon at that point. I certainly didn’t come away from this understanding the optical principles of Kohler illumination.

Poihths (talk) 18:55, 17 March 2024 (UTC)