3k & 2k Lens Compensation

[theinfantry]

My apologies if this info has already been discussed. If it has, I can't find the thread.

Does anyone have the correct factor to use when compensating for lenses at 3k and 2k?

ex. I want to shoot my slow-mo at 28mm, some at 3k and some at 2k - what lens at 3k will give me a 28mm and what lens at 2K will do it?

thanks-

the Infantry

 

[Brandon Fraley]

you mean field of view right?

 

[theinfantry]

Yep - if i want to get as close to the frame that a 28mm lens would give me, how do I get that at 3k/2k?

 

[Brandon Fraley]

i could be completely wrong on this but the 2k frame is 1 quarter the size of the 4k frame, so divide by 4? 28mm at 4k = 7mm 2k?

dunno though

 

[Jason Wingrove]

Its not a conversion chart but hope this helps, I created it using actual screen grabs of 16:9 ftg at 2K, 3K and 4k

cheers
jason



_

 

[Mark Andersen]

i could be completely wrong on this but the 2k frame is 1 quarter the size of the 4k frame, so divide by 4? 28mm at 4k = 7mm 2k?

dunno though

O.K. this is not exact science either but 35mm (4K) FOV with a 28mm lens is closer to 14mm in 2K. Frame is 1/2 as wide, so I believe that to double the degree of view, say a 30 degree angle you would need to go to a 60 degree angle. I think 1/2 the mm = Twice the degree in FOV. I could be a little off here, If someone has a more exact science I'd like to hear it as well.

 

[Brook Willard]

Oy, not this again. :wink:

In order to match FOV between the formats, you'd need to use these lenses:

4K: 28mm
3K: 21mm
2K: 14mm

 

[Brandon Fraley]

thanks Brook lol I make sure to ask you this again in a few months, ok?

 

[Brook Willard]

Just don't ask me about DOF. I'll start banning people.

 

[Roberto B]

hey brook.. 4k ok.. but you didn't add the still 35mm equivalents.. :devil:

 

[Brook Willard]

hey brook.. 4k ok.. but you didn't add the still 35mm equivalents.. :devil:

Oh, you're right.

BANNED!!!