Hello and welcome. My name is Dave Newton. I'm a professional photographer and Canon geek. And I'm here today with Whelan Cameras in the Burren in County Clare to explain to you a few bits of Canon technology.

Okay. Now, the reason I'm here today, the reason we are in the Burren in County Clare is because we have got these two lenses. And I know it can be quite the surprise to see someone holding two big Canon L series lenses up, but they are well, they're not very heavy. They're nice and light. I could stand and lift them both all day. So, we have got here in my right hand, we've got the RF 400mm f2.8 L. And in my left hand, we've got the awesome RF100-300mm f2.8 L.

Now, if you are in the market for these lenses, choosing between them is well, let's be honest, it's a very luxurious position to be in choosing between these two. How do you make the choice? It's tough. Obviously, we've got a prime and we've got a zoom. The zoom is going to give you a lot more versatility in that you've got a 100 to 300mm and it's a constant f2.8. If you are working in closer, great for maybe sports, where you can be a little bit closer, then that's going to be a really good choice.

If, however, you're doing sports that are a little bit more distant, then this 400mm f2.8 is probably going to be your weapon of choice. The nice thing about them both is that you can indeed use the RF 1.4x and 2x extenders as well, so you can get significantly more reach.

Perhaps if you're traveling, this is a slightly smaller lens. It'll pack down into a bag easily. Maybe throw an extender in there two times. You're going to get up to a 600mm f5.6. Obviously, the 400 and the two times is going to give you an 800mm f5.6. In terms of image quality, it is really hard to choose between the two of them. They are both fantastically high-quality lenses. In fact, I say that I covet this lens right now. A 100-300mm has to find its way into my bag quite simply because I'm heading off to do gorillas in the not-too-distant future. And I think this would be the perfect lens for that.

So, there you go. You've got your 400mm f2.8. Great for sports that are maybe a little bit more distant or wildlife in low light or the versatility of a 100-300mm zoom lens.