en
petzval lens
An
English
term in
ConceptNet 5.8
Source:
English Wiktionary
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Related terms
en
lens
➜
en
petzval condition
➜
en
petzval sum
➜
en
photographic
➜
Word forms
en
petzval lenses
(
n
)
➜
Context of this term
en
historical
➜
Links to other resources
en.wiktionary.org
Petzval lens