I used to flip to manual mode, panic, and flip right back to aperture priority. Not because I didn’t understand the concepts in theory, but because in the moment, under pressure, with a subject waiting on me, I couldn’t make the three settings talk to each other fast enough. It wasn’t a knowledge problem. It was a fluency problem.

That changed when I sat down with this crash course from Kelvin Designs and actually worked through it step by step, not just nodded along while half-watching.

If you’ve been circling manual mode for a while and just need someone to break it down without making you feel like you need an engineering degree, this tutorial is exactly that. Here’s what it covers, and how I’d apply it to real shooting situations.

The Three Dials That Control Everything

Manual mode gives you full control over three settings: ISO, shutter speed, and aperture. The tutorial walks through each one individually before connecting them, which is exactly how beginners should approach this.

ISO controls how sensitive your camera’s sensor is to light. Low ISO (100-200) means less sensitivity, less noise, and is ideal for bright conditions. High ISO (1600 and above) is for low light, but you’ll pay for it with grain. The rule of thumb from the tutorial: start at the lowest ISO that still gives you a proper exposure.

Shutter speed is how long the sensor is exposed to light, measured in fractions of a second. A fast shutter speed like 1/1000 freezes motion. A slow one like 1/30 lets in more light but will blur anything that moves, including your own hands if you’re not on a tripod. For handheld shooting, a good baseline is to keep your shutter speed at least equal to your focal length. Shooting at 50mm? Don’t go slower than 1/50.

Aperture is the opening in your lens, measured in f-stops. Here’s where people get tripped up: a low f-number like f/1.8 means a wide opening and more light. A high number like f/16 means a small opening and less light. Aperture also controls depth of field. Wide aperture (f/1.8) blurs the background. Narrow aperture (f/11) keeps more of the scene in focus.

How to Dial In a Starting Exposure

The tutorial suggests a practical starting sequence rather than guessing at all three settings simultaneously. Here’s the logic it lays out:

  1. Set your ISO first based on your lighting conditions. Bright daylight? Start at ISO 100. Indoors or shade? Try ISO 400-800.
  2. Set your aperture based on the look you want. Portraits with background blur? Open up to f/1.8 or f/2.8. Landscapes where everything should be sharp? Stop down to f/8 or f/11.
  3. Adjust shutter speed last to nail the exposure. Your camera’s light meter, visible in the viewfinder, will show you whether you’re over or underexposed. Bring the needle to center.

This sequence works because ISO and aperture are usually driven by creative decisions, while shutter speed is your final trim dial. Once you internalize this order, adjustments become much faster.

Reading Your Camera’s Built-In Light Meter

One thing the tutorial does well is emphasizing the meter. Every camera has one, and most beginners ignore it. It’s the scale visible in your viewfinder or on your LCD, usually running from -3 to +3, with zero in the middle. Zero means correct exposure according to the camera. Negative means underexposed (too dark). Positive means overexposed (too bright).

In manual mode, nothing adjusts automatically, so the meter becomes your feedback loop. Change your shutter speed and watch the needle move. Adjust aperture and it shifts again. Your job is to get that needle close to zero, then decide if you want to intentionally expose brighter or darker for a specific effect.

Where I’d Push Back (Just a Little)

The tutorial is genuinely excellent for getting started, and I recommend it without reservation. My one addition: the light meter is a guide, not a law.

I shoot a lot of backlit scenes, especially during golden hour on travel shoots. If I expose for the meter’s “correct” reading on a backlit subject, the sky blows out and the whole image feels flat. Sometimes the right exposure is -1 or even -1.5 stops, letting the background go darker in exchange for a moodier foreground. Or I’ll expose for the background and let the subject go silhouette intentionally.

The meter assumes an average scene. Your creative eye doesn’t have to. Manual mode isn’t about chasing zero on that scale, it’s about having the tools to land wherever you actually want to be.

From Intimidating to Automatic

Learning manual mode is less about memorizing settings and more about building a decision loop you can run in a few seconds. Set the ISO for your light. Set the aperture for your look. Trim with shutter speed. Check the meter. Adjust once if needed. Shoot.

That loop gets faster every time you use it, until it stops feeling like math and starts feeling like instinct.

Watch the full Kelvin Designs tutorial for the visual walkthrough. Seeing the camera controls and meter in action makes the written version click in a whole different way.