hi,

is there a way to remvoe the site field from the comments form?

yes open
zenphoto/themes/your_theme_name/image.php
find there
<tr> <td><label for="website">Site:</label></td> <td><input type="text" id="website" name="website" size="40" value="<?php echo $stored[2];?>" class="inputbox" /></td>
</tr>

and replace it with

<!--
<tr> <td><label for="website">Site:</label></td> <td><input type="text" id="website" name="website" size="40" value="http://default.value.com" class="inputbox" /></td>
</tr>
-->