Hi,
Our ZoomEffect doesn’t come with any customField plugin. In our Live DEMO, we have used 2 CustomFields (they both come with Virtuemart by default).
1st one is: Cart Variant
2nd one is: Image Type Custom Field.
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As long as you apply the “Attribute <-> Image" matching correctly by following the Video Tutorial. Our ZoomEffect works with all customFields (except Generic child variant type, as it refresh the page upon selecting the variant)
In the video tutorial we have explained the “dropdown” custom field, but the procedure is exactly the same for all custom fields. You will do the “EXACT” same thing. Investigate the custom field attribute, note the "value", then type this value to product image meta tag field.
FYI: If you already apply the “Image Type” custom field, but the result doesn’t look as good as you see it on our Live DEMO. Then it means, you are using a 3rd party Vritxemart Template, and your template is causing CSS override. You need to investigate the image Type custom field element by using Firebug and disable the CSS rules that comes with your Virtuemart template and let the CSS file that comes with our ZoomEffect controls the image type custom field.
Regards.