Note that when the HiDPI displays support add-on is enabled the system serves original (big) images in case the device with the Retina display is used. Otherwise, system serves twice smaller images. If you wish to use this add-on, specific images should be uploaded to your products, namely, images in high-resolution.
As far as we see, the size of the detailed image is 250x250px and the thumbnail size on the product page is 500x500px. Image is blurry because system has to stretch the original image to generate the thumbnail. Try uploading larger image to resolve the issue
MurrinMedia, thank you for raising this issue! I've investigated the links to your website and found out that a thumbnail image on product page is blurry despite the fact that the original file is large enough to generate HiDPI thumbnail for product page. The following page is a perfect example: http://missmartini.com.au/store/earrings/statement/a-turquoise-dream/
MurrinMedia, thank you for raising this issue! I've investigated the links to your website and found out that a thumbnail image on product page is blurry despite the fact that the original file is large enough to generate HiDPI thumbnail for product page. The following page is a perfect example: http://missmartini.com.au/store/earrings/statement/a-turquoise-dream/