PIX 2015

A list of good/bad MFT lens for new owner?

Started Oct 1, 2012 | Discussions thread
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Regular MemberPosts: 307
Re: 45-150 or 45-200
In reply to josbiker, Mar 2, 2013

josbiker wrote:

If I like (or change) to steal an ISO stop, I can use a higher or lower shutterspeed or a higher or lower ISO setting or a higher or lower F stop.

What is the nett difference in the end?


Basically OIS means you can take pictures at longer shutter speeds than *suggested* by the 1/focal length rule.

So, say a 45mm MFT lens (90mm FF equiv.)... you should aim to keep shutter speed faster than 1/90 (in reality 1/80 or 1/100), to minimise hand shake.

OIS can typicaly allow you to steal 1 stop 90% of the time, and (maybe) 2 stops 70%, 3 stops 50% (there is no hard and fast *rule* as it is highly dependent on the lens and the photographer...)

So with OIS in the situation above, you would get 90% shake free pictures at 1/40 (1 stop from 1/80), 70% at 1/20, and 50% at 1/10 shutter speeds.

This means that you can try to shoot using a lower ISO then recommended, by trading 1 ISO stop for a shutter speed stop. Think of the exposure triangle, where if you keep Aperture the same, you have to gain or lose equal number of SS or ISO stops to keep exposure the same.

The problem with action shots, you really need around 1/250, 1/500 or even 1/1000 to keep motion blur at bay... (depends on the speed of the object) So OIS can't *steal* those in a way... the only benefit is that it helps you keep the ISO a bit lower.

For sports photography, a high ISO (1600 or 3200) and large aperture (f2.8 if possible) to achieve the high shutter speeds.

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