The Kodachrome film in 35mm came out after the 16mm and 8mm stock late '30s but was pretty sharp although desperately slow at 10 asa, kodacolour similar (32 asa I think) but less sharp. So the summar and elmar were struggling and you needed to stay smaller than f5.6 or 8 - so needed sunny day or solid tripod/static subject, you needed a hood as well. The B&W film was grainy and slow and solvent (fine grain) developers did not help speed sharpness, all depressing.
So we are spoilt with the last few cassettes of K25 (I have one left) and modern optics, high refractive crowns and flints, near diamond hard multi coatings, computer optimised, some aspherics etc. we can use 2.8 or 4, lots more uV near to poles, warmer near poles, longer summers etc.
Dont worry about that your daughter is pretty and you need to catch fleeting expressions with Fuji chrome 400.
Noel