Ok, found this thread that shows how to call my customfield1 into the showimage template:
Got it working.
Now the complicated part
When I call that $customfield in the template, I don't want THAT particular instance to be autolinked. I want it to just show as plain text so I can style the ink (by linking it to an image), like so:
<a href="$customfield"><img src="example.jpg"></a>
Is there a way to take the code in showimage.php
Content visible to verified customers only.
And turn OFF the convert_url_to_bbcode for $shoplink for that instance so it just echos the plain text of http://www.example.com