different TV-standards and also diff. Hz., which resuls in different frames per second for TV-cameras/systems - portions (1/2 or 1/3) are used:
- 60Hz standard - 1/3 is used = 16 2/3 fps
- 50 Hz standard - 1/2 is used = 25 fps
For easy filmtransfer to TV-standard some cameras can run and expose with this frames per second. (some Nizos, CHINON pacific, COSINA.....) - evoidance of flickering or black striation during TV-transfer and to get real speed and presentation time after transfer
If your original film is not taken with this framespeed some actual software can eliminate this. This requires a lot of computer power and time! After doing this often there is seen a loss in quality (sharpness or others). But this is softwaredependant and varies...and of cause the speed of your film is not truely the same like your original.
Adjusting some cameras to 16 2/3 (instead of 18 fps) or 25 fps (instead of 24 fps) is possible - but not selfmade. Only with precision measuring tools this work can be done!