Frederick Langenheim was one of the Art and architecture good articles, but it has been removed from the list. There are suggestions below for improving the article to meet the good article criteria. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake.
The text of the entry was: Did you know ... that Frederick Langenheim made the first set of panoramic images (example pictured) of Niagara Falls and a sequential set of images of the first American total solar eclipse ever photographed?
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"Langenheim and his brother William began working in 1840" - I believe the text in bold might be better off placed at the start or the end of the sentence it is part of
"The seventh set was given to United States president James Knox Polk.[15] The eighth set was retained by the Langenheim brothers.[10]" - consider merging these two sentences together
"There were eight phases taken of different time sequences.[27] They are the earliest known eclipse pictures taken in the United States.[28]" - merging both these sentences might help things here