inverted real image

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    Photo of the image formed by my Sigma 30/1.4; because the object is outside the focal length, the image is real and inverted. Examining feature sharpness by eye verifies that the image is formed at approximately the focal length (relative to the rear principle point of the lens) as expected from the lens equation. Taken with my Olympus 14-42 kit lens; FL-36R bounce flash off the ceiling.

    1. berkeleyhomes-dot-com 50 months ago | reply

      Wow - you can really see how large a 30 mm f/1.4 prime lens is.

    2. D.H. Parks 50 months ago | reply

      Yes, fast primes tend to be fairly large. The Sigma 30/1.4 takes 62mm filters, but this is by no means the largest. For example, the Canon 50/1.2L takes 72mm:

      And don't forget the UWA lenses, prime or otherwise, which can't even use filters. The legendary Nikon 13/5.6 is all kinds of ridiculous:

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