Most websites will use a relatively low-res image as a 'thumbnail' to show a product in a listing (i.e., in search results). This low-res image is usually the first one you see, and allows the results of a search or an individual page to load much faster. Then, you can usually click the image to get a high-res version of that particular image, and at that point you can usually zoom in on to see more detail. Lancaster's site doesn't do this - you can't click on most images when looking at a product to examine it more closely. Though you can sometimes use the browser's controls and/or accessibility options to make an image larger, that larger image will get blurry, as you're not adding detail to the image, you're just stretching it out. Go to a site like Cabelas/BPS and you'll see what I mean. Also notice that they'll have multiple pics of the same product from multiple angles, while Lancaster usually only has 1 or 2 images.Not sure what you mean by “hi-res images?”.
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Ex.:
Lancaster - 2019 Bear Limitless Compound Bow Package
Cabelas - https://www.cabelas.com/shop/en/bear-archery-limitless-rth-compound-bow-package