Samyang 14mm f/2.8: Is this normal IQ?

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cantanima bis Contributing Member • Posts: 782
Samyang 14mm f/2.8: Is this normal IQ?

I am a bit surprised at what I am seeing with the Samyang 14mm f/2.8 in this photo:

f/2.8 on a reasonably well-lit afternoon -- things look smudgy even before you hit pixel peeping levels

I understand that not everything will be in focus at f/2.8, but here it looks as if nothing is in focus. I had in fact focused on the air conditioning unit (manual focus, naturally).

Here's what it looks like stopped down:

I think this was f/5.6 -- lines are well-defined

...and here it is stopped down quite a bit:

At least f/8, probably higher -- grainy, but expectedly so, and still well-defined

Either of these two looks much, much better than the first.

I understand that this lens is supposed to be much sharper when stopped down a bit. I don't really object to that. But is that image "quality" at f/2.8 considered normal on a lens like this? (normally sold for $329)

I care about f/2.8 if only because I might take photos in a church or house, where it's often relatively dark. Should I not care about the sharpness in conditions like this?

The overall image looks OK to me, but generally I like to look in at details from time to time. Reviews of this lens tend to be pretty good, saying it's sharp in the center even when wide open, though not so much at the edges & corners. So I'm thinking I have a dud & should return it. Any thoughts would be appreciated.

 cantanima bis's gear list:cantanima bis's gear list
Fujifilm X-S1 Fujifilm X-Pro1 Fujifilm XF 18-55mm F2.8-4 R LM OIS
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