Canon 300mm f/4 EF L USM
Check availablity: eBay.
Sharpness is excellent. It is acceptably sharp wide open and improves stopped down to f/5.6. Flare and ghosting is well controlled, and almost no vignetting. Its main selling point is that it is less than half the weight and a quarter of the price of the Canon 300 f/2.8 EF L, while offering the same optical performance from apertures f/5.6 and smaller.
It works with the Canon 1.4x TC, but auto-focus becomes less reliable, sharpness suffers, in particular at the edges and there is some vignetting wide open. With the Canon 2.0x TC, you lose auto-focus and image quality is noticably lower.
Mechanically, this lens has a nice, solid feeling. It comes with a removable tripod collar, a built in sliding lens hood and a ring USM focus motor with full time manual overide. The front element does not rotate during focusing.
Rating: Ed: -, User: - (normalized, 0=useless, 50=average, 100=excellent).
Mount: Canon EF.
Aperture range: f/4 to f/32.
Close focus distance (CFD): 250 cm / 8.2 ft (from sensor plane).
CFD magnification: 1:7.7 / 0.13X.
Focus: AF (built-in, ring-type).
Filter diameter: 77 mm.
L x D, W: 90 x 214 mm, 1165 g.
IR: No hotspot reports.
Approximate street price: USD 1100 (new, w/o tax).
Canon is a multinational corporation headquartered in Tokyo, Japan specializing in the manufacture of imaging and optical products. Its products including cameras, lenses, flash units, scanners, photocopiers, printers and steppers (used in semiconductor fabrication). The company was founded in 1937 as Precision Optical Instruments Laboratory and renamed Canon Inc. in 1947.