Hello all, (sorry in advance, my images in question are just linked. They're high resolution so you can see in detail the problem I am talking about. It didn't make sense to downsize them so the forum could display them as you'll need to see the full resolution ones anyway, so I just linked those) I got a new lens recently, a 28mm NIkon/Nikkor f/1.4D, and it's been great, but a friend of mine picked up on something that might be a fault with it. I am interested in input from both people knowledgeable with aperture blades as well as this lens specifically. My friend seemed to think that it was odd, but probably just how the lens is built and I would like to compare it with one of its siblings. First off, he noticed that something was off with the aperture blades Click for full sized image #1 and we saw it in the bokeh Click for full sized image #2 at f/1.4 it's not so bad Click for full sized image #3 Click for full sized image #4 but it starts to get bad near f/1.8 (I would even say f/1.6) and is really bad at f/2.0, after f/3.5 it's totally fine. Click for full sized image #5 You can see in the top left, that you're not just seeing the steps/layers of the aperture blades. It seems like one side isn't closing correctly >_< I have a 50mm f/1.4 D as well and that has no problems whatsoever Click for full sized image #6 (I wrote on the photo that it's an 8 blade lens, that's wrong; it's a 7 blade) Never do you notice a step when looking at the blades, and the Bokeh is always really round. Now I know that the 50mm only has 7 blades, but I heard that 9 blades like what is in the 28mm was meant to produce a more round bokeh. Does anyone think this is a problem with the aperture blades themselves or can anyone with this same lens confirm that this is just infact how this lens is constructed and it is meant to be like this? When looking at other 9 blade lenses like the 50mm f/1.2 it does look like it has a bit of jag/the blades don't produce a totally round hole, but the movement/opening doesn't seem to as off as mine where the blades seem to be at different points on their track. image #7 The bottom only looks slightly more closed than the top but you can still see a difference as the top looks more open than the bottom. Is this just a thing 9 bladed lenses do as a consequence of having so many blades laying on top of each other and competing for room? It'de be cool to see photos of your aperture blades (of the same 28mm f/1.4 D lens) and your bokeh photos to compare. I live in Canada and I'm debating sending it to one of the Nikon repair centres to have it fixed if it is really a defect. I'm going to try contact them in the morning too when they're open. (Also when you reply, I'de appreciate it if you use the image #s so that it's clear which examples we're referring to.