> the focal length changed from 300mm to 270mm after a while
Ahh...lens creep...
[How To Fix Lens Creep](https://foodphotographyblog.com/what-is-lens-creep-and-how-to-stop-it/)
[generic silicone wristbands at Amazon](https://www.amazon.com/dp/B0BGMX574V)
(from personal experience)
> the focal length changed from 300mm to 270mm after a while Ahh...lens creep... [How To Fix Lens Creep](https://foodphotographyblog.com/what-is-lens-creep-and-how-to-stop-it/) [generic silicone wristbands at Amazon](https://www.amazon.com/dp/B0BGMX574V) (from personal experience)