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Dlskidmore (talk | contribs) m (→Duochrome test: I think there is signs confusion here. Need to re-work the wording that is not backwards when signs are considered.) |
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[[File:Chromatic aberration lens diagram.svg|Chromatic aberration lens diagram]] | [[File:Chromatic aberration lens diagram.svg|Chromatic aberration lens diagram]] | ||
= Duochrome test = | == Duochrome test == | ||
{| class="wikitable" | {| class="wikitable" | ||
|- | |- | ||
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<youtube>WP6eeoyB9go</youtube> | <youtube>WP6eeoyB9go</youtube> | ||
= External Sources = | == External Sources == | ||
* [[Wikipedia:Chromatic aberration]] | * [[Wikipedia:Chromatic aberration]] | ||
* [[Wikipedia:Duochrome test]] | * [[Wikipedia:Duochrome test]] | ||
== Lens Material == | |||
Different materials have different [https://en.wikipedia.org/wiki/Abbe_number Abbe numbers]. Materials with higher values are better, since they tend to have less chromatic aberration. | |||
Here are some typical values:<ref>https://www.allentownoptical.com/abbe-value-interpretation/</ref> | |||
{| class="wikitable sortable" | |||
!Material | |||
!Index | |||
!Abbe Value | |||
|- | |||
|Crown Glass | |||
|1.523 | |||
|59 | |||
|- | |||
|High Index Glass | |||
|1.60 | |||
|42 | |||
|- | |||
|High Index Glass | |||
|1.70 | |||
|39 | |||
|- | |||
|Plastic CR-39 | |||
|1.49 | |||
|58 | |||
|- | |||
|Mid Index Plastic | |||
|1.54 | |||
|47 | |||
|- | |||
|Mid Index Plastic | |||
|1.56 | |||
|36 | |||
|- | |||
|High Index Plastic | |||
|1.60 | |||
|36 | |||
|- | |||
|High Index Plastic | |||
|1.66 | |||
|32 | |||
|- | |||
|Trivex | |||
|1.53 | |||
|43 | |||
|- | |||
|Polycarbonate | |||
|1.58 | |||
|30 | |||
|- | |||
|MR-174 | |||
|1.74 | |||
|32 | |||
|} | |||
==References== | ==References== | ||