Low Res files in Camera Tracking Software

Hello
i have a simple question about the interpretation of the camera data.
For a job shot with RedCamera at 4k 16/9 (4096*2304) with a lense of 20mm, i need to recreate the camera with PfTrack.
So filmback is 22.12 * 12.44 mm

The question is if a made a low res file of for example 2048*1152 or Hd 1920*1080 can keep the same film back size or need i use the 2k film back or set an unknown camera in pfTrack. And for the lense, what i’m suppose to do? 😎
So need i keep all the info like i am working in the 4k Resolution shot ? or not? 😀 Or maybe work with the 4k rushes

And maybe for people who are familiar with Maya.
When i export my cam (maya ascii default setting) with a correct size (i use two point measured on set) the two point who are distant for 1 meter in real life, are distant for 1 cm in Maya.
Is it normal? Need i change the scale export ?
Thanks for all

b

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