# @adorama on YouTube

- **Type:** Video
- **Original URL:** https://youtube.com/watch?v=ut5FZWxYpPU
- **Gondola URL:** https://gondola.cc/posts/71205663-adorama-youtube
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/455b8ed9f6.jpg
- **Posted:** 2026-09-22T14:00:26.000+00:00
- **Account Owner:** Adorama (@adorama) — https://gondola.cc/adorama

## Caption

Today's question from Steve R. is, “An f/4 lens is normally considered to be slow compared to, let’s say, an f/1.8 lens. But doesn’t that depend on the lens? It appears that a 50mm f/4 is faster than an 18mm f/1.8. Am I looking at this correctly?”

Go to http://www.AskDavidBergman.com to submit your own photo question and view the episode archive.

Adorama for all your gear purchases https://dl.davidbergmanphoto.com/4q9ki

00:00 Intro
01:01 How Aperture Works
01:43 What Does F-Number Mean?
03:29 Why F/4 Is the Same on Every Lens
04:43 What Makes a Lens Fast or Slow?
05:58 18mm F/1.8 vs 50mm F/4
07:04 Outro

SUBSCRIBE AND BE PART OF THE ADORAMA FAMILY: 
➥ https://www.youtube.com/user/adoramaTV 

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✘ GEAR USED:

Canon RF 50mm f/1.8 STM Lens 
https://dl.davidbergmanphoto.com/tm0wf

Canon RF 135mm f/1.8 L IS USM Lens 
https://dl.davidbergmanphoto.com/rc2r5

✘ PRODUCTION EQUIPMENT USED:

Canon EOS R Mirrorless Full Frame Digital Camera Body 
https://dl.davidbergmanphoto.com/cle86

Canon RF 24mm f/1.8 Macro IS STM Lens 
https://dl.davidbergmanphoto.com/no43c

Manfrotto MT055XPRO3 Black Aluminum Tripod with MVH502AH Pro Video Head
https://dl.davidbergmanphoto.com/tfa9g

Godox KNOWLED M300BI Bi Color LED Light 
https://dl.davidbergmanphoto.com/zcrju

Glow EZ Lock Octa Quick XL Softbox With Bowens Mount (48") 
https://dl.davidbergmanphoto.com/fghrb

Prograde cards and readers
https://dl.davidbergmanphoto.com/eizdl

#focallength #cameratipsandtricks #adorama

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➥ TikTok https://www.tiktok.com/@adoramanyc
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➥ Instagram https://www.instagram.com/adorama/ 
➥ X https://x.com/adorama
➥ Discord https://www.adorama.com/discord

❐ MORE ADORAMA ❏
➥ Shop https://www.adorama.com/
➥ Blog https://www.adorama.com/alc/
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➥ Adorama Events https://www.youtube.com/@AdoramaEvents 

__________________________________
More of David Bergman

Stay in Touch with David:
https://thedavidbergman.com

Prograde cards and readers
https://dl.davidbergmanphoto.com/eizdl

__________________________________
THANKS SO MUCH FOR WATCHING!

## Stats

- **Views:** 16,828
- **Likes:** 475
- **Shares:** 0
- **Comments:** 35

## Tags

focallength, adorama, cameratipsandtricks

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