Talk:Barlow lens

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Minor math error in Barlow lenses for microscopes.

Corrected a minor math error in the section about Barlow lenses for microscopes. I also enhanced the text a bit to make that section a little more readable. Patrick (talk) 00:12, 12 December 2017 (UTC)[reply]

Downside of using a Barlow lens

It seems that the downside of using the Barlow lens is not described in this article. On a telescope, the image either becomes smaller or the field of view is reduced or both. Could someone describe this issue properly in the article?