The images field can be used to edit groups of images very easily by drag-and-drop. Simply take an image from the sidebar and drop it on the field. You can also reorder images inside the field, not linked to the regular order.

Put the kirby-images folder into your site/plugins folder and rename it to images.

slideshow:
  label:       Slideshow
  type:        images

To display an image slideshow with the selected images you can use a code like this:

<div class="slider">
<?php foreach($page->slideshow()->yaml() as $image): ?>   
  <?php if($image = $page->image($image)): ?>
    <?= $image->crop(1200,500)->html(); ?>  		    
  <?php endif ?>
<?php endforeach; ?>
</div>

You can even move images between multiple instances of the images field like this:

As of Images 1.0.4 you can limit the number of images:

slideshow:
  label:       Slideshow
  type:        images
  limit:       4