Canon 135mm MORE than Sigma 200mm ??? (pic)

Started Oct 18, 2005 | Discussions thread
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Jack_DC Senior Member • Posts: 2,442
Canon 135mm MORE than Sigma 200mm ??? (pic)

Attached a Canon 135mm lens and a Sigma 18-200 @200mm, took images from same position about 7ft from camera. The Canon 135mm has more magnifaction than the Sigma at 200mm. ??

I understand about focal L being measured at infinity but should it differ by so much at 7 feet?

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