Just purchased a Sigma 50mm 1.4 very soft wide open????

Started Feb 3, 2013 | Discussions thread
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DaSigmaGuy Forum Pro • Posts: 12,294
Re: Just purchased a Sigma 50mm 1.4 very soft wide open????

jburrows500 wrote:

1.4 ISO 100

1.8 @ 100

2.0 100

2.5 100

2.8 100

3.5 100

5.0 100

Just purchased a brand new 50mm 1.4 tonight and did a few test shots. Imported them into lightroom and found the images very oft wide open. Did a little test with same iso (100).. the results explain why my images appeared soft and not at all sharp.. see ingredient printing.. becomes clear until 2.0. Did I get a bad copy or is this what I should expect at 1.4.. Thanks!

Its a DOF issue...the wider the aperture, the shallower the DOF and the larger the sensor, the shallower the DOF for a given f-stop at a set distance.   You have a big sensor and a fast aperture, hence the problem.

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