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The GoolRC 420-800mm is a manual-focus super telephoto zoom for DSLRs, sold with a T-mount adapter ring for Canon EF bodies. It uses a simple 4-element, 2-group design, a push-pull zoom, and a fixed tripod collar with a 1/4-inch thread. It is a low-cost way to reach very long focal lengths for moon, wildlife and distant subjects, but it is slow at f/8.3-16, manual only, and needs bright light and steady support. Compared with autofocus telephoto zooms, it gives far more reach for far less money, with softer optics and no stabilization or AF.
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Out of stockSold by Shrewd ChoiceReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
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Lowest price we've seen: $61.19 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
Owners treat this as a cheap way to get extreme reach, and most accept its limits. They report soft images unless stopped down and mounted on a solid tripod, and manual focus makes fast action hard.
This is a manual-focus super telephoto zoom lens with a 420-800mm focal length and an aperture of f/8.3 at 420mm to f/16 at 800mm. It uses a T-mount (T2) and comes with a T-mount to EF-mount adapter ring for Canon EF-mount cameras. The zoom is a linear push-pull system, and focusing is manual and helical (rotary). It is not compatible with autofocus.
The body is all metal. The optics are 4 elements in 2 groups, with multi-coating to reduce flare and ghosting and optical glass for high light transmittance. A lock fixes the lens in place. A rotating base with a 1/4 screw thread lets the lens mount on a tripod or monopod.
Automatic exposure is available only in Aperture Priority mode, and only on cameras with TTL metering systems. Other cameras must be set to full manual.
