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

Started Jan 8, 2013 | Discussions thread
Flat view
richj20 Veteran Member • Posts: 4,842
Olympus 40-150mm @150mm: "wide open" or "stopped down"?

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:


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:




-- hide signature --

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

 richj20's gear list:richj20's gear list
Panasonic Lumix DMC-GX8 Panasonic Leica 100-400mm F4.0-6.3 ASPH Sony Alpha 7R II
Flat view
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow