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30mm sigma art = 50mm FF

Started Aug 1, 2015 | Discussions thread
captura Forum Pro • Posts: 27,478
Re: 30mm sigma art = 50mm FF

Tom Caldwell wrote:

Donald B wrote:

Jon Schick wrote:

Not quite - it's the equivalent of 60mm field of view but I agree it's a great lens...I have one too, and also highly recommend its longer 60mm sibling.
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No its not ! its 50 mm, have you got a FF with a fifty on it, its the same FOV. I have the 60 and its awesome as well.

cheers don

Well sometimes lens manufacturers round up or round down their lens labelling to suit "known" lens focal length steps. As the Sigma Art lens was designed for aps-c use I would not be surprised if it did not exactly convert to a precise "30" and there is also no telling whether your FF "50" is precisely a "50" as there were quite a few "55" lenses on offer and presumably some were in-between and labelled "50" for convenience and market acceptance. Nobody is going to worry much if the lens on their camera is truly a 52.6mm and not a precise 50mm.

In any case "50-60" in FF terms, it is an academic exercise - it is a good lens any which way.

The Sigma 30mm lens for the APS-C Sony NEX series produces 1.5 X 30 = 45mm FF equivalent, for what it's worth. It is pretty much identical to the Sigma 30 for M43, except that the mount and concomitant registry distance is suitably changed.

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