Default image for advanced custom fields

With this if else condition you can add default image for advanced custom fields image field. If your image field value is empty default image will display.

<?php if(get_field('banner')){?>
<div class="inner_band"><img src="<?php the_field('banner'); ?>"/></div>
<?php } else{?>
<div class="inner_band"><img src="<?php bloginfo("template_url"); ?>/images/inner.jpg"/></div>
<?php } ?>