This is now my current code –
<?php if(get_field('images')): ?>
<?php $size = "thumbnail";?>
<?php while( has_sub_field('images')): ?>
<?php $image = wp_get_attachment_image_src(get_sub_field('image'), 'full'); ?>
<?php $thumb = wp_get_attachment_image_src(get_sub_field('image'), 'thumbnail' ); ?>
<div class="item">
<!-- Lightbox Image's -->
<a href="<?php the_sub_field('image');?>" class="fancybox" rel="gallery_group">
<!-- Thumbnail Image's -->
<img src="<?php echo $thumb;?>">
</a>
</div> <!-- End item -->
<?php endwhile; ?>
<?php endif; ?>
And outputs this –
<div class="item">
<!-- Lightbox Image's -->
<a href="359" class="fancybox" rel="gallery_group">
<!-- Thumbnail Image's -->
<img src="Array">
</a>
</div> <!-- End item -->
<div class="item">
<!-- Lightbox Image's -->
<a href="358" class="fancybox" rel="gallery_group">
<!-- Thumbnail Image's -->
<img src="Array">
</a>
</div> <!-- End item -->
<div class="item">
<!-- Lightbox Image's -->
<a href="357" class="fancybox" rel="gallery_group">
<!-- Thumbnail Image's -->
<img src="Array">
</a>
</div> <!-- End item -->
