Canon 300mm f/4

Canon · LTM · 1960 · Telephoto

Also known as: Canon 300mm f/4 · Canon 300mm f4 · Canon 300/4

Variants & identification

Variant	Mount	Years	Serial ranges	Production
Canon 300mm f/4	Mirror Box / Mirror Box 2 via bellows	1960	—	No figure published

The Mirror Box (1957) screws into the body's 39 mm thread and holds a mirror that flips up on a double cable release; its lenses focus by their own helicoid or by a bellows. The Mirror Box 2 (1958 per lens-db and the museum's M-lens dates; 1961 per Leica Copies Japan) clips onto the Canon 7's outer bayonet and takes its own three-lug lenses — the M135 and M200 — and the 400 to 1000 mm heads through an intermediate tube and Bellows R. The two boxes' lens mounts do not interchange (Leica Copies Japan).
The museum's page gives weight and date only; no construction, filter or close focus. Nothing else consulted describes this lens.

How to tell them apart (expand)

Canon 300mm f/4:

Marketed January 1960, sold overseas only · 1200 g · stops to f/22
1,200 g; sold overseas only (museum); construction not recorded by the museum

Specifications

Formula: Telephoto
Aperture range: f/4–f/22
Weight: 1200 g
Years manufactured: 1960
Country: Japan
Original price: Sold overseas only — no yen list price (January 1960, Canon Camera Museum)

What reviewers say

No reviews aggregated yet — this family is still in the research queue. Written one? We'd love to index it.

History

A 300mm head of January 1960 that the Canon Camera Museum records as sold overseas only, 1,200 grams, with no construction given. It belongs to the January 1960 batch of long lenses made for the Canonflex and usable on the rangefinders through a mirror box and bellows.

Little is written about it and less is known; it is on this page so that the line is complete.

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This history is AI-written, from the sources listed at the foot of the page. Where the record is silent it says so rather than filling the gap — but no human wrote these sentences.

Example photos

Sample photo wanted — shot with a Canon 300mm f/4? We'd love to feature it (with credit).

Live listings

Asking price, EUR: a median of €230 across 4 fixed-price listings on 2026-09-11 (middle half €150–€240). Tracked since 2026-09-09, 2 days: unchanged from €230.

By day

Date	Median	Middle half	Listings
2026-09-11	€230	€150–€240	4
2026-09-09	€230	€150–€240	4

Asking prices from the listings scanned, not sales; junk-flagged rows and auction lots excluded; other currencies are not converted.

Canon 75-300mm f/4-5.6 Objektiv — €145.00 · eBay
Canon RF 75-300mm f/4-5.6 Teleobjektiv - Gebraucht wie neu — €225.00 · eBay
Canon RF 75-300mm F4-5.6 – kaum genutzt, neuwertig, OVP — €240.00 · eBay
Obiettivo Canon RF 75-300mm F4-5.6 — €320.01 · Sabatini Fotografia
Canon RF 75-300mm f/4-5.6 Lens (Canon RF) — $184.99 · eBay
Canon 300mm f4 L IS [MINT-] — $625.00 · Victory Camera
Canon RF 75-300mm f4-5.6 Lens - 1 Year Warranty - FREE UK Delivery — £198.00 · eBay

Listings updated 2026-09-11. Links go to the shop or marketplace that carries the item.