https://monnier.astro.lsa.umich.edu/research/index.php?action=history&feed=atom&title=Champ_Triplet_DimensionsChamp Triplet Dimensions - Revision history2026-07-31T16:06:23ZRevision history for this page on the wikiMediaWiki 1.42.1https://monnier.astro.lsa.umich.edu/research/index.php?title=Champ_Triplet_Dimensions&diff=1126&oldid=prevMonnier: New page: Prescription: From 300K->77K, assuming Al contracts by 0.38% (when cooling from 300K->77K): CaF2 contracts by 0.284% SiO4 expands by 0.001% [hardly at all] distances i...2010-05-26T15:13:52Z<p>New page: Prescription: From 300K->77K, assuming Al contracts by 0.38% (when cooling from 300K->77K): CaF2 contracts by 0.284% SiO4 expands by 0.001% [hardly at all] distances i...</p>
<p><b>New page</b></p><div><br />
Prescription:<br />
From 300K->77K,<br />
assuming Al contracts by 0.38% (when cooling from 300K->77K):<br />
CaF2 contracts by 0.284%<br />
SiO4 expands by 0.001% [hardly at all]<br />
distances in mm<br />
Space between centers of (77K) (300K)<br />
Pupil - Lens 1 0.50 0.502<br />
Lens 1 -2 1.805 1.812<br />
Lens 2 -3 5.048 5.067<br />
Lens 3 - IMAGE 42.367 42.528<br />
and also the ACTUAL measurements from ISP.<br />
SEE below also :<br />
Center Thicknesses from parts themselves:<br />
77K 300K<br />
Lens #1: 6.023 6.04<br />
Lens #2: 3.066 3.066 [same]<br />
Lens #3: 7.036 7.056</div>Monnier