Focal Length / Distance Calculator
Find the exact shooting distance you need for any portrait focal length, or work backwards from your available space to find the right lens. Select your subject, framing, and sensor size to get precise results.
Distance Comparison for Common Portrait Lenses
For a with framing on .
| Focal Length | Distance | Perspective | Typical Use |
|---|---|---|---|
How Focal Length Affects Portraits
Your choice of focal length changes everything about a portrait. Not just how close you stand, but how your subject's face looks, how the background renders, and how much breathing room you have on set.
Most photographers grab whatever lens is already on the camera. That works, sometimes. But once you understand what each focal length actually does to your image, you start making deliberate creative choices instead of just hoping for the best.
Perspective Compression Explained
You have probably heard that telephoto lenses "compress" a scene. That is a bit misleading. A 200mm lens does not physically squish anything together.
What actually happens is simpler than it sounds. Because you stand much further back to get the same framing, the relative distance between your subject and the background shrinks. The background appears larger and closer. That is where the smooth, layered look of telephoto portraits comes from, with those creamy, blown-out backgrounds everyone loves.
Wide-angle lenses do the opposite. You are standing close to your subject, so the background looks far away and small. Features nearest the lens get exaggerated. Noses look bigger. Foreheads bulge.
This is not a lens defect. It is purely a consequence of how close you are standing. Crop a wide-angle shot taken from further back and the face looks perfectly normal.
Working Distance and Your Environment
Here is something the calculator above makes painfully clear: longer lenses need a lot of room.
An 85mm lens shooting a full-body portrait on full frame needs roughly 3.5 metres of space. Switch to a 135mm and you need over 5.5 metres. In a small studio or a cramped living room, that 135mm full-body shot just is not happening.
This is worth checking before a shoot, not after you have arrived and realised you brought the wrong lens. Punch your numbers into the calculator and plan accordingly.
Choosing the Right Portrait Lens
For headshots and head-and-shoulders framing, the 85mm to 135mm range on full frame is hard to beat. You get flattering perspective, lovely background separation, and a working distance where you can actually talk to your subject without raising your voice. These are the go-to focal lengths for portrait photography. The 85mm f/1.4 and 135mm f/2 are classics for a reason.
Want to show more of the environment? A 35mm or 50mm lets you include surroundings while staying close enough to direct your subject. Just keep them near the centre of the frame to avoid that stretched look at the edges.
Then there is the 200mm. Gorgeous for outdoor fashion and editorial work where space is not an issue. The background compression is stunning.
The tradeoff? At 8+ metres away, you will need walkie-talkies or hand signals to communicate. It is a different way of shooting entirely.