I have searched the forums & and am confused that support has given these different answers: --Suggest your customers to add images of dimension (400x350)px. --So we would recommend you to add the image size equal to or maximum to 440px x 270px. --But you can recommend images of size (450 x 300)px. Different sizes for different image locations? Does it change with updates or why all the different sizes? - which one is correct?
There is no accurate recommended size for slider image in Geocraft theme, theme automatically resize/crop the image according to the requirement, You can use images of dimension 440px x 270px for your slider, it works fine.