Canon RF $649.95 opening: 5 used lenses to check this week

System weather: Canon RF has the clearest opening in this week's live listings. Canon's RF 100-400mm is at $649.95 used, condition 9, at B&H, while Canon Price Watch shows new authorized-dealer stock at $699 and MPB used listings beginning at $664. The gap is useful for a buyer today, although it is a current price comparison rather than proof of a six-month low. 1

The five listings below are live checks from MPB and Canon Price Watch on August 28, 2026. The readable pages did not provide a complete six-month sold-price series for these exact models. Each history field therefore says what the source actually supports: a current inventory spread or an observed dealer checkpoint. MPB's individual dealer transaction count and 99% feedback percentage are also unavailable, so the seller signal here is the exact copy's photos, grade, accessories, warranty, and return route when the page exposes them.

The live MPB page shows 37 available at $329–$429. The $329 floor has no visible exact SKU or grade, so the correct label is floor grade unconfirmed. MPB's related X-mount inventory puts the XF 56mm f/1.2 R at $319–$464, a useful low-price pairing if a wide prime is the first piece of a small Fuji kit. 2

Call: conditional buy. The opening is real only if the $329 copy is the WR version named here and clears the usual lens checks: autofocus from minimum focus to infinity, aperture response, front and rear elements, filter threads, and any haze or fungus. Ask MPB for the exact SKU before paying. The lens has no shutter count; those optical and mechanical checks are the condition signal. MPB states that its used listings carry a standard six-month warranty, but the page does not expose the dealer's transaction count or feedback percentage. 3

MPB lists 49 units from $329 to $894. The wide spread says more about mixed copy condition and accessories than about a verified price crash. The floor grade remains unconfirmed because the model page does not attach a visible condition card to the $329 unit. MPB's related XF 18-55mm f/2.8-4 R LM OIS sits at $304–$499, making it the sensible lower-cost companion for a two-lens X kit. 4

Call: wait for the exact copy. A telezoom at $329 would be an opening if the optics and OIS are clean, but 49 units give you room to be selective. Check the zoom ring for roughness, the barrel for impact damage, OIS engagement, autofocus at both ends, and haze or fungus under a light. Weather sealing is a feature of the lens design; a used copy still needs intact seals, switches, and mount contacts. The listing supplies no shutter count because this is a lens.

The model page shows seven units at $524–$659. The floor copy is SKU 3992711, priced at $524 and graded Good. The exact page includes a tripod ring, front and rear caps, MPB's standard six-month warranty, and one sentence that decides the purchase: the internal optics have moisture. MPB says image quality is currently unaffected, but its grade guide says moisture can limit the maximum grade, and moisture is a functional risk that deserves attention. 35

Call: skip — too risky. The $135 gap to the $659 Excellent examples buys a much better chance of clean internal optics. A lower-cost EF pairing exists in MPB's live related inventory: the EF 35mm f/2 IS USM starts at $379, but that pairing makes sense only after an EF body and the 300mm's moisture risk are out of the decision. 6

This is the week's strongest conditional buy. Canon Price Watch records B&H Used, condition 9, at $649.95, first seen 21 hours earlier. The same page records B&H new stock at $699 and MPB used inventory from $664 to $734, with visible MPB cards graded Excellent and Like New. That is a live cross-market opening; the first-seen times remain listing checkpoints, not a six-month price history. 17

Call: high-confidence conditional buy. Choose the B&H condition-9 copy if its photos show clean elements, the zoom and focus rings move evenly, autofocus is quiet and repeatable, and IS engages. The f/8 long end and the lack of a complete six-month history keep this from being a blind buy. For the RF system, MPB's RF 50mm f/1.8 STM starts at $164–$194, an inexpensive normal prime to add after the telezoom. 8

MPB has two units at $949–$1,019. The $949 floor is a specific copy, SKU 4110694, graded Excellent, with its hood, caps, original packaging, and a standard six-month warranty. The $1,019 copy is Like New. Nikon's Z 50mm f/1.8 S appears in the same MPB page's related inventory at $294–$394, giving the system a much cheaper normal-lens pairing. 9

Call: wait. The floor copy is properly graded and the accessory bundle is clear, yet a two-unit pool gives little evidence of a sustained drop. Buy the $949 copy when 20mm is the focal length you need this week; otherwise wait for a lower observed checkpoint. Test corner sharpness, autofocus, manual-focus response, aperture control, and internal dust before the return window closes.

The RF 100-400mm is the one to open first: $649.95 at B&H condition 9 sits below the current MPB floor and the $699 new-dealer checkpoint. The Fuji 16mm deserves a conditional SKU check at $329. The Fuji 70-300mm has enough inventory to wait for a clean graded copy. The Canon EF 300mm moisture copy is a skip. The Nikon Z 20mm is a good lens at a thinly evidenced floor, so it is a wait unless the focal length is urgent.

This week's readable sources support live prices, inventory spreads, exact grades where the SKU is visible, and dealer checkpoints. They do not support complete six-month ranges, eBay sold history, or the configured 50-transaction/99%-positive seller test for dealer listings. Verify the exact copy, optics, accessories, warranty, and return terms at checkout.