Hi, I'm new here, first post. Based on the positive reviews and impressive samples I saw here and elsewhere, I ordered an Olympus Pen 38mm f/1.8 lens for my NEX-5N. Right away I was pleased with it stopped down to f=2.8 and beyond. Test pics: Oly Pen 38/1.8 by scott.t.t, on Flickr F=4.0: Oly Pen 38/1.8 @ f=4.0 by scott.t.t, on Flickr But the reason I bought it was to shoot wide open, and with this sample I've been a bit disappointed at the lack of sharpness, ghosting, and coma (if those are the right terms to use), with a general low contrast haziness in OOF areas that worsens as you move off center to mid-frame. The lack of sharpness is to the extent that achieving critical focus if my subject is off-center (e.g. rule of thirds composition) can be difficult, even with EVF and focus assist (coming from someone who mostly shoots legacy glass). My Question: Is this normal, or did I receive a bad one? The auction listing did state "I have cleaned some inner element," which I (naively?) assumed was a good thing. Unfortunately I got it over Eb*y from Japan, so a return might not be worth the shipping cost. Oly Pen 38/1.8 at f=1.8 by scott.t.t, on Flickr Crop: Pen 38 @ 1.8 crop by scott.t.t, on Flickr Focused on the small statue: Pen 38 @ 1.8 by scott.t.t, on Flickr Crop: Pen 38 @1.8 crop by scott.t.t, on Flickr Stopping down to 2.8 improves considerably (as is the case for a lot of fast glass): Pen 38 @ 2.8 crop by scott.t.t, on Flickr f=1.8: Oly Pen 38/1.8 @ f=1.8 by scott.t.t, on Flickr Crops with ghost halo: _DSC5441-3 by scott.t.t, on Flickr _DSC5441-2 by scott.t.t, on Flickr Even worse, at night (note: it looks like motion blur, but it's really just blooming): Oly Pen 38/1.8 Coma wide open by scott.t.t, on Flickr San Francisco last night at f=2.8: Oly Pen 38/1.8 @ f=2.8 by scott.t.t, on Flickr and f=1.8: Oly Pen 38/1.8 @ f=1.8 by scott.t.t, on Flickr The coma seems to have a radial pattern: f=1.8 Oly Pen 38/1.8 @ f=1.8 by scott.t.t, on Flickr Again, improving at 2.8: Oly Pen 38/1.8 @f=2.8 by scott.t.t, on Flickr Worse at mid-frame off-center, f=1.8 Oly Pen 38/1.8 @f=1.8 coma by scott.t.t, on Flickr Oly Pen 38/1.8 @ f=1.8 coma by scott.t.t, on Flickr I was curious to see how much of this was due to field curvature (not knowing much about optics and aberrations), so I did a comparison with Nikkor AI-s 35/2, Fujian 35/1.7, and Helios 44-2. (The Nikkor produces a pretty violet color which I'm assuming is heavy CA. Goes away at f=2.8. But I digress.) Coma Comparison by scott.t.t, on Flickr Anyway, would appreciate any feedback on my samples with this lens. Is the problem more my needing to learn how to get the best out of this lens, or did I receive a lesser sample? The off-center aberrations seem more pronounced than with my Helios 44-2 for example, not just in the corners but well-into mid-frame, which could be limiting compositionally, and I don't see this kind of haziness in the samples that other folks have posted. By a third of a stop over f/2 it gets better, but then I've lost the smoothness and light advantage of shooting wide open, which was a big motivator for the purchase. My main purpose is for people pictures, and indoors. What do you think? Cheers!