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 AskDavidBergman.com to submit your own photo question and view the episode archive. Adorama for all your gear purchases 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: ➥ youtube.com/user/adoramaTV __________________________________ Be the first to shop our great deals and sales by signing up for emails from Adorama! adorama.com/MyAccount/Login 🔷 Save 5% Every Day† or Special Financing* On purchases of $199+ with the Adorama Edge Credit Card. Learn More: adorama.co...