see also:

• Canon EF lenses
• Canon EF 300mm f/2.8L USM lens
• Nikon AF-S 300mm f/4E PF VR lens
• Olympus mZD 300mm f/4 PRO lens

• 300mm f/4 pro lenses were available with and without image stabiliser, although the non-IS version is no longer marketed
• the IS version was introduced in 1997 and was one of Canon's 1st IS lenses

• 300mm f/4
• no rear gasket sealing
• 2EV image stabiliser
• 77mm filter
• 15 elements in 11 groups
• internal focus
• focus limiter switch
• 8 straight blades
• 4.9'/1.5m close focus giving 1:4.2 (0.24x)
• 41.6 oz./1,180g lens only, 45.8 oz./1,298g with collar
• 90mm x 221mm
• built-in telescoping hood
• removable tripod collar
• $US1399

• http://www.kenrockwell.com/canon/lenses/300mm-f4-is.htm
• http://www.photozone.de/Reviews/172-canon-ef-300mm-f4-usm-l-is-test-report--review
• http://www.lenstip.com/211.1-Lens_review-Canon_EF_300_mm_f_4L_IS_USM.html
• https://www.ephotozine.com/article/canon-ef-300mm-f-4-l-is-usm-interchangeable-lens-review-4497
• http://www.wlcastleman.com/equip/reviews/300mm/
• http://www.dxomark.com/Lenses/Canon/EF300mmf-4L-IS-USM
• wildoceanphotography review of lens with 1.4x TC