Technique advice needed please

[Penstock]

Good afternoon,

I currently shoot with a Canon 70d with an 18-200mm lens. A little dated i know but next year i intend to purchase an A7iv with Tamron 35-150.

my daughter is an amature showjumper and most of my photography is in burst mode whilst the horse is in flight over fences.

my technical question is "whilst actually shooting in burst mode can i adjust the focal length at the same time, ie zoom in and out during the same burst of shots" ?

horse jumping is not particularly fast, nothing like basket ball for example. do you think my choice of A7iv with the Tamron 35-150mm is suitable. in my mind it allows for nice close in shots which the normal 70-200 would struggle with.

thanks to all in advance.

Penstock....Cheshire, England.

 

[Unframed Dave]

If you're using continuous focus, you zoom in and out whilst shooting with continuous drive mode.

I would think most would opt for back button focus for what you are doing.

Personally, I think 135mm focal length is a bit short for your needs. It depends on how far away you will be and whether you want the whole horse in the shot or close in on the rider.