Calculations of a FF Lens on S35 Sensor

Got something to discuss that's not about Blackmagic products? Then check out the Off-Topic forum!
  • Author
  • Message
User avatar


  • Posts: 195
  • Joined: Sun Aug 23, 2020 7:53 am
  • Real Name: Hayk Haykyan

Calculations of a FF Lens on S35 Sensor

PostMon Jan 23, 2023 4:14 pm

Can you tell me how to calculate FF lens measurement in millimeters of the focal length for a 6k pro or any S35 sensor?

Example Canon FF 24-105mm how much will be converted if to use it on a BMPCC6K Pro?
BMPCC6K Pro / Tokina 11-20 / Canon 17-55 / Sigma 18-35 / Sigma 50-100 /
User avatar


  • Posts: 2231
  • Joined: Tue Aug 28, 2012 6:04 pm
  • Location: italy

Calculations of a FF Lens on S35 Sensor

PostTue Jan 24, 2023 12:08 pm

Focal length is ever the same, change the field of view (focal angle).
Usually the calculation is focal angle / 1.65.
Or if you are more confortabile with focal lenght you can calculate focal lenght * 1.65 (since).

Anyway is a concept, not a real value.
There is many aps-c, s35, ff sensor size, the value 1.65 is only a roughy reference to know how is the crop. For example I had 3 different size of sensor s35 from Ursa Mini Pro, pocket6k, Bmpc4k against aps-c of my Fuji x-t4.
From many years I learned to put lens on mount for what I like to see, then check if my space in front of subject allow me to work correctly

Inviato dal mio iPhone utilizzando Tapatalk

Return to Off-Topic

Who is online

Users browsing this forum: No registered users and 4 guests