When pressing strings with left hand of violin, should the fingers stand up (picture and text)

There are too many students who are taught by teacher to get up with their fingers so that they don't dare to put their fingers on strings at any time and use some very reluctant postures to hit strings.
It's not really that teachers taught them wrong. In most cases, standing fingers show better working skills. However, everyone's fingers are different lengths, and distance between each step is also different. , so position of fingers cannot be static.
I still want to emphasize this concept
The purpose of good posture should be to allow you to operate your fingers more flexibly, not to do so-called correct posture, but fingers become very inflexible.
These photos are taken from
"Violin player and teaching method" by Galamyan
In this book

Please take a look at "Demonstration 1" in upper left corner,B to Re Mi without lifting, index finger rests. Why is index finger pointing down?
Because index finger will block position of middle finger in a standing position if index finger is not lying down, there is usually no way to get close to middle finger, otherwise two fingers must be squeezed tightly. hard. (Actually, there is another method where both middle and index fingers can stand together, but we will not discuss this part for now.)
Also, most of little fingers are not very straight and are in a semi-recumbent state because distance between little fingers is relatively large and little fingers are relatively short, so little fingers will naturally be placed there in this pose.
Sometimes I also run into students who want to practice little finger to get up, which shouldn't be necessary. Also, if little finger is shorter than average person's, it's okay to lie flat on it completely, otherwise they won't be able to press it at all .

"Demo 7" and "Demo 8" have relatively sparse action images with different hand sizes. You may notice that stance of strings will be different for different hand sizes. different sizes - still normal hand shapes, i.e. fingers are fleshy, neither long nor short, but fingers are round.
I have seen others: only little finger is very short, shape of finger is very flat, finger is very thin, etc. The position of pressing strings will be different.
These demo images only show that shape of these hands is suitable for pressing strings in this way. Please don't force yourself to press exactly same position as in picture, but pay attention to reason for ability of these hands to press strings.
Another random mention
In Demo 7, bending wrist due to small hands is often prohibited by teacher, but for people with small hands, bending wrist should be a necessary movement. ; The position of thumb can be adjusted to a relatively lower position to help ring finger tap the pitch more easily.
When pressing strings with left hand of violin, should the fingers stand up (picture and text)