MFT 25mm f/1.4 fails to blur background like Full Frame 50mm lens @ f/2.8

Started Feb 16, 2014 | Discussions thread
papillon_65 Forum Pro • Posts: 27,030
Re: What a surprise !

Sergey_Green wrote:

assaft wrote:

Generally, to maintain the same dof and shutter speed on a FF sensor, you'd need to set the ISO two EVs higher.

Does it mean people who who come from cropped sensor background and use FF cameras now all shoot at 2 stops higher? Kind of difficult for me to imagine that.

Sometimes yes, many times no. For instance, if you don't have image stabilisation in the lens or camera then it's a definite possibility. However, the better lenses have very good image stabilisation which usually means no. It depends on what you shoot, what light you're shooting in, what you're trying to achieve and what you're using. I have two very good Tamron lenses which both have excellent image stabilisation, they are my main lenses, if I use them then there is no problem with having to shoot at higher ISO's unless I want to match the dof I'd get using an m4/3's sensor and I don't have enough shutter speed to do it without raising ISO ( and assuming image stabilisation won't help i.e freezing movement in the scene ). This is not a scenario I encounter too often. Alternatively I have the Sigma 35mm F1.4 Art which has no stabilisation so I might lose a stop or two using it in poor lighting compared to a camera which has in-camera stabilisation using an equally fast lens, if the subject is moving then there is no comparative loss, in fact I'm winning over a smaller sensor. It's all swings and roundabouts, pick the tool that does the job best for you, that's it in a nutshell.



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- sergey

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