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Anyone compared the Leica CL set at iso 800, vs at 400,  400 vs at 200, would the image quality difference be obvious?  Or not too big?

The reason is when using the 55-135, due to it's slow speed, might like to set at 400, or 800 for hand held, but not sure if the image quality is acceptable at that? 

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I did some testing at 400/800/1600 and then 3200/6400. Found that difference between 400 and 800 weren't so much at all, some minor losses  up to 1600, but still nice. However, at 3200/6400, there is a noticeable change. 

In general, feel comfortable anywhere up to 1600, and then the higher is reserved for "really want the shot, regardless". Others may feel differently, and say the higher up is OK - but it will show in DR and large prints. 

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