Yesterday I′ve had the same problem and solved it in my way:
An optimum size for the picture should be a width of about 700px.
Anyway you can automatically resize the pictures:
The preset paramete inside the image.php is 1200px (I don′t know why? – it doesn′t fit)
…./wp-content/themes/fotogram/image.php
You can adapt the value: (I changed it from 1200 to 700)
$attachment_size = apply_filters( ‘fotogram_attachment_size’, 700 ); echo wp_get_attachment_image( $post->ID, array( $attachment_size, $attachment_size ) ); // filterable image width with, essentially, no limit for image height.
