Lens Speed


Lens speed (f), indicates how much light the lens is capable of shooting to render the subject. It is the ratio of the diameter of the aperture input and focal length.

The following apply when setting the lens speed:

  • Brighter lens luminosity, produces better quality rendering of the resulting images.
  • Higher f-numbers indicate smaller apertures, shorter exposure times, and a lower risk of blurred images.
  • When increasing the focal length, decrease the lens speed.
  • Lowering the lens speed and exposure time under good light conditions, achieves less depth of field.

Methods of expressing luminosity

  • F-number: f4 or ranges in Zoom Lenses: F4.0-5.6
  • Evaluative number: f1/4 or ranges in Zoom Lenses: f1/4.0-5.6

Quality maximum aperture lenses

  • f1.4 for lenses with fixed focal lengths
  • f2.8 for zoom lenses with variable focal lengths

Lens offers

Browse the

Print
Gift Adviser
Check order status
Contact us
Customer service
Mo-Su 8:00AM-8:00PM
+421 2 5710 1800

P-DC1-WEB01
We will call you and advise you professionally
+420 225 340 120
Order inquiry
Question about the product
Please enter your telephone:
Call me
We care about your privacy Alza.cz a. s., Company identification number 27082440, uses cookies to ensure the functionality of the website and with your consent also to personalisage the content of our website. By clicking on the “I understand“ button, you agree to the use of cookies and the transfer of data regarding the behavior on the website for displaying targeted advertising on social networks and advertising networks on other websites.
More information Less info
I understand Detailed settings Reject everything