索尼相機鏡頭評測 三大人像焦段（50/85/135mm）畫質虛化全面對比

Hey everyone, today I'll be comparing three very popular prime telephoto lenses for portrait photography at an on-location photoshoot. I have the 50mm, which is a medium telephoto and the widest lens we have today, the 85mm and finally the 135mm, which is going to be our most zoomed-in focal length. I have lots of photo examples to show you and I want to share with you what I think each of these focal lengths excel at and where each of these focal lengths struggle. I also want to say thank you to PPA for sponsoring today's video. I'll let you know more about them a little bit later on. For each of these comparisons, I'm going to start off on the widest lens, so the 50mm, then I'll do 85mm, then 135mm. And just here in this spot, I'm going to start with a medium-length photo and I've got some depth to the background there, so we'll see the differences between each lens. I'm going to talk about how each of these focal length choices can affect your subject's face shape, the bokeh and the context of your photos. So, one of the reasons that makes the 50mm, 85mm and 135mm such popular portrait lenses is the way they control background compression. In this first comparison photo set, I'm taking a mid-length portrait of Yasmine, where you can see quite a lot of the background in the frame, so we can see how these focal lengths look different to each other. So now I'm on the 85mm and I have to take a few steps back to get similar framing to the 50mm. Basically, a good rule of thumb to keep in mind is the longer the focal length, the more the background looks like it's being brought towards the subject. This creates a more compressed and flatter look to the photo. Just the over-the-shoulder looked really cool too, yeah. And now I'm on the 135mm and I need to step out onto the road to be able to get the same framing. This effect is the most noticeable with the 135mm lens, which is a great focal length choice when you want to create a very dreamy, blurred background. The 85mm also achieves this background compression, but it's slightly less dramatic compared to the 135mm. Finally, the 50mm lens, since it's the widest focal length of the three, it has a larger field of view. This means it's a better focal length if you want to capture environmental style portraits, where context of the location is important. When you take a look at this first comparison side by side, keep an eye on the background. Even though I'm framing each shot to look the same, the background slowly starts to disappear the longer the focal length I'm using. For our next comparison, I want to share with you how you can choose the right focal length depending on your subject's facial features. But first, I want to let you know more about the sponsor of today's video, Professional Photographers of America, who are an online community where you can find heaps of benefits that are essential if you run your own photography business. As a PPA member, you can protect your photography equipment with up to $15,000 worth of coverage, protection from damage, forced entry theft, and have access to data loss recovery. They also have resources to help you get started with your new or established photography business, like customizable contracts, pricing guides, portfolio reviews, marketing templates, and heaps, heaps more. So if you want to learn more about PPA, please be sure to use the link in my description to get a discount on your membership. Next up, I want to take some close-up headshots. So I've got this spot here just in the shade and we've got a little bit of greenery as well just to add some context to the photos so it's not just like a plain colored wall. And I'm going to start off again on the 50mm. This lens has a wider field of view. So this means if you get too close to your subject, you will start to notice some distortion. Some of your subject's facial features can start to appear unnatural the closer you physically get to your subject to frame your shots. So this framing right here is about as close as I would normally get with a 50mm. I think this composition right here is so flattering. But if you're in need of shooting tighter headshots and tighter close-ups, then you might want to take a look at these other two focal lengths instead. Next is the 85mm. And I find this focal length is just the best of both worlds, basically. The 85mm has a nice balance between compression and distortion. So it lets you get close enough to the subject without distorting their facial features, but still gives you a good field of view for close-up headshots. Last but not least, I have the 135mm. With a 135mm focal length, something interesting about this is that even though this lens can capture flattering headshots with a really balanced perspective, similarly to the 50mm, you need to keep in mind that it can introduce some distortion as well, especially depending on the person you're photographing. So unlike a 50mm, which can stretch out someone's face, a 135mm can actually flatten the subject's face and make them look less dimensional in the photo. So I find that depending on the person I'm photographing will depend on which focal length I decide to use. So I find that if someone has a wider-shaped face, I will opt for using wider-angle lenses like 50mm. If I were to use a 135mm, this is going to flatten their face even more, which will exaggerate their features, it'll make their face appear wider in the photo, and you'll end up with just an unflattering portrait. I feel like if you stand just here, that would look really nice. This looks amazing here. I love it. Something that I think telephoto lenses are really good for are taking full body shots because the compression makes the photo look so beautiful. So I've picked this spot here, got Yasmin standing on the footpath, and then you can see like the whole street down there. So that will show us a really good comparison between each focal length. Making use of these longer portrait lenses is a great option when you're taking photos in a really busy-looking location like this, as these lenses can help separate the subject from the background. But they will do this in slightly different ways. Do you want to try some? Maybe with your arms crossed, might be cool there as well. Yeah, I love that. While all three focal lengths are great at creating this really dreamy look, here you can see the 85mm and 135mm pull ahead from the 50mm. I'm shooting all these photos wide open. So even though this 50mm shot is at f1.4, you can still see a lot of detail and texture in the background, which means we don't have that clear background to foreground separation the other two lenses provide. I've switched over to the 85mm now and I've had to take at least five steps back to get the same framing. For me personally, I really like this look though. In a lot of situations, I like including more context and story in my photos. So when I have a really beautiful location like this, I would choose to shoot with my 50mm as it's a nice balance between sharing the location while still getting the subject to stand out. If you're someone like me who prefers using wider lenses for portrait photography, then I also made a similar comparison video, but this time with the 35mm vs 50mm vs 85mm and I'll leave that link down below if you want to watch. I also have an entire series, by the way, comparing focal lengths like 24mm vs 35mm or 85mm vs 135mm, which I'll also leave linked down in the description if you want to see different photo shoots and comparison images. But anyway, out of the 85mm and 135mm, the 135mm provides the most dramatic results, but in this situation, they do actually look pretty similar. With the 135mm, I am now standing in the middle of the road because I have to be super far away to get the same composition. That looks so good. One downside for me with the 135mm is that I have to stand very far away from my subject to be able to capture this shot, which can make it tricky to communicate and might not always be possible to have this much space in a location to shoot with. Finally, while not as intense as the 135mm, in my opinion, the 85mm is yet again, the perfect middle ground, where you do have a significant amount of separation without the need of being so far away physically from your subject. So I have one last comparison set for you, and here we have something interesting to look at with the bokeh. I really like how in the 50mm and 85mm shot, you can see a lot of well-formed round bokeh. You can also see how the focal length changes the context of each shot. With the 50mm shot, you can make out more of the background. So you can see that there is a little footpath there to her right. The light is just incredible on this street. Like it's just making your face glow. On the 85mm shot, the footpath is still there, although it's a lot harder to make out what it is, especially if you aren't seeing the behind the scenes of this shoot first. And then we have the 135mm photo. I find in this location, the image is so compressed that the bokeh loses a lot of definition. The blurred areas create a more uniform wash of colour, which can be both a positive and a negative, depending on what you're looking for in the image. In terms of context in the frame, the background of the 135mm shot has completely melted away. This can be handy in situations when you're shooting in a really busy location And this is one of the reasons I like using longer lenses sometimes. Let me know in the comments which one is your favourite focal length to use for portraits. And don't forget to check out PPA by using the link in my description. But as always, thank you so, so much for watching. I make new videos every single week, so I'll see you all next time. Bye.