The Sony a7 V sits atop Map Camera’s monthly digital camera sales rankings for a third straight month. The Ricoh GR IV Monochrome also had a superb debut despite its high price premium, charting just behind the a7 V. Given that camera manufacturers themselves do not share specific sales information for camera models, and many retailers outside Japan don’t publish sales charts, Japanese photo retailers are often the best, most reliable sources for camera popularity. Map Camera’s data is particularly excellent, as the large photography retailer provides monthly sales charts for new and used digital cameras and caters to a dedicated audience of enthusiasts and professional photographers. In the case of the Sony a7 V’s chart-topping performance for the third straight month, though, it’s no aberration. Not only has it performed well at other camera retailers in Japan, but it also had a very successful launch, per PetaPixel‘s sources in the U.S.…