Photography FAQs: RAW, Aperture and ISO

Photography comes with a vocabulary that can feel like a private language. RAW, f-stops, ISO, white balance: the terms pile up before you have taken your first decent picture. This photography FAQ collects the questions beginners ask most often and answers each in plain English. Skim the headings to find your question, or read straight through for a quick tour of the essentials.

RAW and File Formats

What is a RAW file?

A RAW file holds the unprocessed data recorded by your camera’s sensor. It is like a digital negative: it contains a lot of information, but it needs to be developed in editing software before it looks like a finished photograph.

What is the difference between RAW and JPEG?

A JPEG is processed inside the camera, with color, contrast and sharpening applied, and then compressed into a small file. A RAW file skips most of that processing, so it is larger but gives you more flexibility to change exposure, white balance and tones afterwards.

Should I shoot RAW or JPEG?

If you plan to edit, RAW is usually the better choice, because you can recover detail in highlights and shadows and fix color without degrading quality. JPEG is fine for quick sharing or when storage is tight. Many cameras offer RAW plus JPEG, which gives you both.

Do I need special software to open RAW files?

Yes. Camera makers supply their own software, and many general editors can open RAW too. Compatibility depends on your camera model and the software version, so check that your program supports your camera.

Aperture and Depth of Field

What is aperture?

Aperture is the adjustable opening inside a lens that controls how much light passes through. It is written as an f-number, such as f/2.8.

Why does a small f-number mean a big opening?

The f-number is a ratio comparing the lens’s focal length to the opening’s diameter. A smaller number means a larger opening. It feels backwards at first, but it becomes second nature quickly.

What does aperture do to my pictures?

It does two things. It changes brightness, since a wider opening lets in more light. It also changes depth of field, which is how much of the scene appears sharp. A wide aperture gives a blurrier background, and a narrow one keeps more in focus.

Which aperture should I use for portraits?

Try a wide setting, such as f/1.8 to f/2.8, for a soft background. If the face looks partly out of focus, close down a stop or two. For groups, use a narrower aperture, so everyone stays sharp.

Which aperture is best for landscapes?

Many photographers use around f/8 to f/11 for a good balance of sharpness and depth. Very narrow apertures can introduce softness from a physical effect called diffraction, so extremes are not always best.

ISO and Noise

What is ISO?

ISO is the sensor’s sensitivity to light. Higher values make the picture brighter without changing the aperture or shutter speed, but they increase image noise.

What ISO should I use?

Use the lowest ISO that gives you a fast enough shutter speed. In daylight that is often 100 to 400. Indoors or at night you will need higher values. Modern cameras cope better with high ISO than older ones, so do not fear it when it keeps your picture sharp.

Is noise always bad?

Not necessarily. A little grain can look natural, especially in black and white. Heavy noise hides detail, though, so reduce it in editing or add light if you can.

Shutter Speed and Motion

What is shutter speed?

The length of time the shutter stays open. It is measured in seconds or fractions of a second.

What shutter speed freezes motion?

It depends on how fast the subject moves. People walking may need about 1/250, running children 1/500 or more, and fast sport 1/1000 or above. Test and adjust.

Why are my handheld photos blurry?

The shutter speed may be too slow for your focal length, your focus point may be off, or your subject may have moved. Raise the shutter speed first and check again.

How to Shoot in Manual Mode Step by Step

Exposure and Modes

What is the exposure triangle?

The relationship between aperture, shutter speed and ISO. Changing one affects brightness, so you balance the others to compensate.

What mode should a beginner use?

Aperture priority is a friendly choice. You pick the aperture, and the camera chooses shutter speed. When you are comfortable, try manual.

What does exposure compensation do?

It tells the camera to make the image brighter or darker than it thinks is correct. Use plus for snowy or bright scenes, which the camera tends to underexpose, and minus for very dark scenes.

What is a histogram?

A graph of the tones in your image, dark on the left and bright on the right. It helps you spot lost shadows or blown highlights more reliably than the screen preview.

Focus, White Balance and Lenses

What is the difference between single and continuous autofocus?

Single autofocus locks focus once, which suits still subjects. Continuous keeps adjusting as the subject moves, which suits children, pets and sport.

What is white balance?

A setting that corrects color casts caused by different light sources so whites look neutral. Auto usually works, and with RAW you can change it later.

Do I need an expensive lens?

Not to start. A kit lens is fine to learn on. If you need better low-light performance or blurrier backgrounds, a fast prime is a popular upgrade. Prices vary, so.

Photography for Beginners: Camera Basics Explained

Practical Questions

How do I make my photos sharper?

Use a faster shutter speed, focus carefully on the eye or main subject, use a tripod when practical, and avoid extremely wide or narrow apertures when sharpness matters most.

How should I store and back up my photos?

Keep at least two copies on separate devices, and preferably a third somewhere off-site or in cloud storage. Do not format your memory card until the files are safely copied.

How do I get better quickly?

Shoot often, review your pictures honestly, study work you admire and focus on one skill at a time.

Conclusion

Most photography confusion clears up once you understand RAW, aperture, ISO and shutter speed. Keep this photography FAQ handy, experiment with one setting at a time, and you will soon find the jargon becomes second nature. Pick a question from the list and test the answer with your own camera today.