Everything relating to microscopy hardware: Objectives, eyepieces, lamps and more.
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hans
- Posts: 1006
- Joined: Thu May 28, 2020 11:10 pm
- Location: Southern California
#61
Post
by hans » Thu Oct 22, 2020 11:52 pm
apochronaut wrote: ↑Thu Oct 22, 2020 11:26 am
There is no specific reason why either of them should or need be, since unlike older systems where the illumination source could be at variable distances, the illumination sources for both the 100 series and the 400 series are fixed. Since they both were used in the 100 watt and standard wattage systems, it would make sense that they be infinity only if the collector lens focal planes are at different distances between the 100 watt version and the 20/24 watt version.
This may be a source of confusion... my understanding is the the collimator is called the collimator because it "provides an image of field iris F1 at infinity." (Wording used in the patent.) It does not collimate the actual light source. The filament/arc/whatever is focused "in the region of condenser front pupil plane F2." (Actually somewhat in front of it according to Brian's simulation and my tests.)