Olympus 40-150mm @150mm: "wide open" or "stopped down"?

Started Jan 8, 2013 | Discussions thread
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richj20
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Olympus 40-150mm @150mm: "wide open" or "stopped down"?
Jan 8, 2013

For a zoom lens like the Olympus 40-150mm f/4-5.6, it's widest aperture @150mm is f/5.6.

I've wondered if this is considered "wide open" or "stopped down" from f/4.

A similar question was asked last year in the Sony Nex forum:

http://forums.dpreview.com/forums/post/40616511

One poster suggested an answer; however, no scientific data were given to back it up. A brief search on the internet didn't reveal a discussion of this.

I've been curious about this, because, regarding the Olympus lens: depending on who is writing, it either is or is not sharp "wide open", and is or is not sharp @150mm.

I've found this lens to be good in both cases. Here are a few samples @150mm:

http://jaeger.ws/olympus40-150

regards,

Richard

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"Careful photographers run their own tests." - Fred Picker

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