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Lens Guide· 12 min · Must-read before buying

Don't know which
lens to buy?

What focal length means, prime vs zoom, and what crop factor is — everything you need to know before buying a lens, all in one place.

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Already know the basics? → Jump to the buying checklist로 바로 이동하세요.

Jump toFocal Length Prime vs Zoom Crop Factor Buy Checklist Starter Sets

Focal Length — one number that changes the whole mood

The mm number printed on the lens is the focal length. Smaller numbers mean wider views; larger numbers mean narrower, more zoomed-in views. The same subject looks completely different depending on focal length.

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14~24mmUltra-wideLandscape · Architecture · Interiors

Very wide

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Edge distortion

landscape

24~35mmWideTravel · Snap · Environmental portrait

Wide

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50mmStandardDaily life · Street · Food

Closest to the human eye

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Natural but lacks personality

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85~105mmMedium telePortrait · People

Slightly compressed

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70~200mm+TelephotoSports · Wildlife · Events

Far subjects up close

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Large & heavy, watch for camera shake

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Most-used focal lengths: portraits → 85mm, daily/travel → 35mm, landscape → 16–24mm. Start with 50mm and you can cover almost any situation.

Prime vs Zoom — which one fits you?

Both are great. But the right choice depends on your shooting style.

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Prime Lens

Best image quality & bokeh

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Better image quality and bokeh than zoom lenses at the same price

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Bright aperture (f/1.4–f/1.8) — excels in low light

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Light and compact — comfortable for travel and daily use

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No zoom — you have to move your feet to change framing

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Costs add up if you need multiple focal lengths

Best for: People who prioritize portraits, low-light shooting, or bokeh

Example lenses

50mm f/1.8 (great value starter)85mm f/1.8 (portrait)35mm f/1.8 (everyday snap)

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Zoom Lens

Best convenience

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One lens covers wide-angle to telephoto

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Easy to reframe — ideal for beginners

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Handles travel, events, and varied situations

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Maximum aperture is darker than a prime at the same price

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Bulkier and heavier (especially f/2.8 zooms)

Best for: People who want one lens for travel and multiple genres

Example lenses

18-55mm (kit lens, starter)24-70mm f/4 (standard zoom)70-200mm (telephoto zoom)

Crop Factor — why does the same lens look different?

The mm rating on a lens is based on full-frame. Put it on an APS-C camera and the effective angle of view changes. Most beginner mirrorless cameras use APS-C sensors — always check.

Full Frame

×1×

Reference value. Same angle as the lens marking.

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50mm → 50mm

Sony A7 series, Canon R6, Nikon Z6

APS-C

×1.5~1.6×

Same lens looks more telephoto

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50mm → 75~80mm

Sony ZV-E10, Fujifilm X-T30, Nikon Zfc

Micro Four Thirds

×2×

Maximum telephoto compression, wide-angle is disadvantaged

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50mm → 100mm

Olympus OM-D, Panasonic G series

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Practical tip: On an APS-C camera, use a 50–56mm lens instead of 85mm (full-frame standard for portraits) to get a similar angle of view.

Pre-purchase checklist

Check these five things before buying on impulse.

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Mount compatibility

The lens must match your camera body's mount.

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Sony E / Canon RF / Nikon Z / Fujifilm X — differs by brand

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Maximum aperture

f/1.8 = low light & good bokeh. f/4–f/5.6 = mainly for bright conditions.

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For indoors, night, or bokeh — f/2.8 or faster recommended

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Focal length

Check that the angle of view matches the genre you want to shoot.

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Portrait: 50–85mm / Landscape: 16–35mm / Daily: 24–50mm

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Weight & size

For a lens you'll carry every day, lighter is better.

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Under 300g — easy to carry daily

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Budget

Starting with a used 50mm f/1.8 is the best value for beginners.

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Used lenses have almost no quality difference

Starter lens sets by level

No need to buy expensive lenses right away. Start with one of these sets, build your feel, then upgrade.

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Entry

Kit lens + 50mm f/1.8

Start with the kit lens that comes with your camera, then add one prime

Kit lens (18-55mm) — All-rounder for daily & travel

50mm f/1.8 — Portraits & low-light bokeh

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Intermediate

35mm f/1.8 + 85mm f/1.8

Two-prime combo — from street shooting to portraits

35mm f/1.8 — Snap · street · daily

85mm f/1.8 — Portrait & bokeh

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Advanced

24-70mm f/4 + 50mm f/1.8

Zoom for versatility + prime to fill in night and bokeh

24-70mm f/4 — All-purpose zoom for travel & events

50mm f/1.8 — Low light & bokeh

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View buying guide

Includes shop links

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expand_circle_downWant to know more — MTF, distortion, coatings, 3rd-party lenses

Intermediate+

What is an MTF chart?

A graph showing a lens's resolving power in numbers. Lines closer to the top and flatter = better image quality. Check sites like DXOMark and LensRentals.

Lens coatings

Nano coatings and fluorine coatings reduce backlight flare and ghosting, and repel dust and smudges. Canon SWC, Sony Nano AR, and Nikon Nano Crystal Coat are the most well-known.

Third-party lenses (Sigma · Tamron · Tokina)

Many third-party lenses are 30–50% cheaper than OEM lenses while matching or beating them in image quality. The Sigma Art series and Tamron 28-75mm f/2.8 are especially popular with beginners and intermediates.

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TRY THIS TODAY

Shoot the same subject with 3 different focal lengths on your phone

1Pick one subject (a cup on your desk works fine)

2Shoot on your phone at 0.5× (ultra-wide) — 1 shot

31× (standard) — 1 shot

42× or 3× (telephoto) — 1 shot

5Compare the three shots and see the angle-of-view difference with your own eyes

What to look for: With wide-angle, the background is broad; with telephoto, the subject looks bigger and the background compresses. Swapping camera lenses works exactly the same way.

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