Okay? Moving into image quality, nikon publishes and you can find online empty f charts modulation transfer function charts which is basically a rating of the sharpness of their lenses and so if you want to see how sharp the lenses you could look at the graph and if you know how to read the graft you could tell how sharper lends it is now before I explain how to read the graph, I have to tell you these aren't totally accurate because they are theoretical they're not actual data that is tested they know that if they use this type of lens and this type of order this is the result that they should get in sharpness and so the actual lenses mayberry now to read the chart here's a couple of charts just to show you a good lens on the left and then not so good lands on the right zero indicates the middle of the lens remember I said the lenses sharper in the middle and less sharp he should go to the edge is well, the bottom access is working its way into the corner of the frame. All right? And ...
so what this says to me is that now I guess I'll give you the other part of it here the vertical access is explaining everything above point six indicates a good sharp lands everything above point eight is a very sharp lands so in the example, on the left, we have a very sharp lens in the center, and it still holds the sharpness, but not quite as good as we get off to the edges on the example on the right it's, sharp in the middle, but it loses sharpness way over to the edges. This is what I would expect from a large zoom lens, which has a little bit lower image quality. Now the colored lines and the dash lines and the dotted lines indicate different types of resolution, whether it's parallel or perpendicular to the middle of the frame, and whether it shot at the maximum aperture or att f eight or eleven, or depending what aperture they decide to choose shoot it at one of the interesting facts about this is that if you're interested in brok, the out of focus area of an image that one way can be judged is by looking at the empty f charts in the mohr the closer the lines are together, the better out of focus area you're going tohave so it's, not so much that the lines are at the top of the frame, but if this red line and the debt red dashed line are in line with each other, you're probably gonna have better, okay, so this lens would probably indicate not as good of out of focus brok area and so that's, another way to judge okay, from a technical standpoint, and so I'll share with you a few of the e f curves that nikon is actually published, that you can go find if you just type in nikon empty f the particular lens that you're interested in, and you'll find that very few lenses or anywhere close to perfect, you'll find that some of the best lenses are like their five hundred f or telephoto lenses. There are some lenses that are considered very good lenses, but from their empty f charts, they don't look so great has to do with how complicated and difficult that lenses to make one of the places you can go to judge how good your lenses is, a place called d x o mark dot com and what they do is they judge and test lenses, and they judge them in many different ways, and one of the ways that they test him is with a collection of features, sharpness, distortion, been getting transmission, chromatic aberration, which are all very important now. How they balance them may not be the way that you would balance him in importance, but they've ranked all the lenses and let's take a look at the ten worst nikon lenses, okay, and on the left will look at the top ten. Lenses. Now what you khun generally notice is in the right hand side, we have a lot of zoom lenses, and on the left hand side, we have a lot of prime lenses that have fairly fast apertures. Now, does this mean you shouldn't buy one of those lenses over on the right hand column? I would be perfectly happy I've owned lenses over on the right hand side. I would recommend those lenses in some cases just because okay, little bit lower image quality, but they have all the other characteristics that fit what you need. Image quality is but one link in the entire chain. In case you're wondering about aftermarket lenses, here are the top ten non nikon lenses that you can buy. We'll look and talk specifically about almost every one of these when we get into the prime lenses and look at that, we have a tamarin zoom lens in there, one of the top ten, and so we'll be talking about that one as well, and you can go to their website and you can check up the camera you use in which lenses are best for it, which is kind of fun.