Macro photography focusing rails for stacked focus, especially with Nikon macro lenses or Canon 65mm MP-E f2.8 macro lens with 5X enlargement | Digital Photography
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Canon MP-E 65mm f/2.8 1–5x Macro - Wikipedia
Laowa 65 mm f/2,8 2x Ultra Macro APO pre Canon M - SmartWear - Eshop