The headshot has evolved rapidly over the past few decades. An image that was once captured at a moment's notice – a quick face-on photograph shot against a plain background – has now become a way to convey who you are.

"Your headshot is arguably the most important part of your brand and therefore needs to express something about you, or something you want to portray to the world," says studio portrait specialist Ivan Weiss.

Based in London, UK, Ivan has been immersed in photography for as long as he can remember, thanks, in part, to his father's career as a press photographer. Childhood days spent in the darkroom instilled a creative drive that he still embraces today. "Portrait photography offers the benefits of being creative while working with somebody to achieve something useful that will be important to them," he says.

While there is no consensus on what differentiates a headshot from a portrait – "ask four photographers and you'll get four responses," says Ivan – he concedes that while all headshots are portraits, not all portraits are headshots. "A modern headshot involves finding out how someone wants to present themselves to their audience. A portrait is more of a subjective interpretation of that person," he concludes.

Here, Ivan explains how he encourages his clients to let their personalities shine through, and why the Canon 球探体育比分_欧洲杯足球网乐￥在线直播 System is ideal for capturing his striking headshots and portraits.

How do you direct your subjects to achieve natural shots?

"I give my clients a lot of direction, starting from the feet up, even if we're doing a close-up portrait. The way you distribute your weight through your feet will affect your stance and your mood, and that's going to be perceived by the viewer. Once I have them where I want them, I engage them in conversation. And it can be absolutely anything. I'll throw a maths question at them. One of my favourites is asking if they've ever been arrested.

"Once you've seen their reaction, you can find whatever is appropriate for that shoot. It almost gets to the point where it's like we've been friends for a long time. That's the thrill for the portrait photographer; to make a connection with a person who was previously a complete stranger."

You use the Canon 球探体育比分_欧洲杯足球网乐￥在线直播5 and the Canon 球探体育比分_欧洲杯足球网乐￥在线直播. What advantages does mirrorless technology give you as a photographer?

"The Eye AF function on the Canon 球探体育比分_欧洲杯足球网乐￥在线直播5 gives you freedom to concentrate on composition. It's so intuitive, you can position the person anywhere in the frame and it will pick out their eyes. Once you have your basic composition, you can move your angle to get things exactly as you want without losing your focus point. My aim is to not think about the camera – and for the sitter not to think about the camera either. That's what mirrorless gives me."

What are your go-to lenses for portraits and headshots?

"If I'm on location, a zoom lens is a great option. The Canon RF 28-70mm F2L USM gives me everything in one lens. I can shoot close-ups at 70mm at f/2, which gives you that feeling of really drawing into the eyes and everything else receding into the soft wash. It performs as well as the previous generation of prime lenses at smaller apertures. So, it's really sharp. I'll use it at 28mm for full-length portraits and 35mm to include more background. A lot of my clients are actors, so I'll probably shoot horizontally so it looks like they're on a movie set."

What about prime lenses?

"The Canon RF 50mm F1.2L USM is the best lens ever made in the history of photography. Full stop. Close up it can introduce a bit of perspective distortion for an intimate feel. Used in landscape orientation, there is room to use negative space to frame a head-and-shoulders portrait. For a half-body shot, it gives a natural perspective and, even in a small studio, it can be used for a full-length shot.

"The Canon RF 85mm F1.2L USM DS is my go-to lens for corporate headshots when the client wants something that looks good on everybody. The 85mm is perfect for head and shoulders. I shoot it horizontally so you get a bit of room to use some negative space. My 85mm is the DS version, so when I open it up to f/1.2, it has this defocus smoothing so you get an even smoother feel to the out-of-focus background. It saves a lot of time on retouching."

You primarily use continuous lighting setups. Why is that?

"With continuous lighting, you can see what you're doing. And that's helped me to develop this style of precise lighting. Most of my clients aren't used to being photographed. 'Look relaxed, but freeze,' are two very contradictory instructions. Having the freedom to create more precise setups with somebody who doesn't know what to do in front of the camera is very liberating."

Can you tell us a bit about your workflow using Canon's Digital Photo Professional (DPP) software?

"I use a combination of EOS Utility and DPP for tethered shooting, and Canon's Picture Style Editor to create my own colour profiles for the camera. When I look through the electronic viewfinder, I see my colour profile and contrast settings before I take the shot. It's a much faster process and enables you to get things right in camera which, from a commercial point of view, is an advantage. But perhaps the biggest bonus is establishing your credibility in front of your client. If the first shot you take is spot on, that's going to have an effect on how they perceive you and how the rest of the session goes.

"DPP is the first step of my post-production workflow. I use the built-in rating system to review all the images from the shoot and create a shortlist of the best. Once we've selected the images for final editing, I make any necessary small adjustments to exposure, white balance, mid-point and clarity on the RAW file, and usually take down the overall contrast a little bit so that I have more latitude for pushing specific colours and selectively applying contrast. I apply my preferred sharpening settings and create a 16-bit TIFF file which I then export to image editing software for the more detailed retouching and colour grading. I’ve got it set up so that the TIFF files are saved to a subfolder so that everything stays organised."