This picture comes with a question!
I sold my 70-200L f/4 lens during the week and need a picture of my Dogs for a frame my GF brought in, the thing is I’m finding it much harder to get as many “keeps” from the 50mm 1.4 than I did with the f/4!
what’s confusing me is the f1/4 let’s in more light then the f/4 so how comes I got more “freeze” motion pics with the f/4?
Just being out now and I only got this one out of about a dozen shots.
I think freezing motion is a combination of shutter and the direction in which the subject is moving. I don’t know what settings you used for this phot or the others that were unsuccessful but this one may have worked partly because the doggies are moving more or less in the direction of the lens. Have a look at the article below. You will certainly find better articles on the net about this but it gives you the basic idea.
Remember also that if you do use the maximum F1.4 on the lens the depth of field will be very shallow, so don’t confuse blur caused by shallow depth of field with blur caused by the motion of the subject.