The Canon EF 75-300mm f/4-5.6 III is a low-cost full-frame EF telephoto zoom. It gives faraway subjects a much larger place in the frame, which is why it is still tempting for wildlife, sport and distant details. The catch is that it is a very old design with no image stabilisation in this version, a slow variable aperture and modest performance once light falls.
What 75-300mm means on Canon cameras
On a full-frame Canon EF DSLR, it gives the framing suggested by its focal length. On an APS-C DSLR, the 1.6x crop gives the angle of view of roughly 120-480mm. That does not create extra optical magnification; it narrows the field of view, so the same distant subject fills more of the final image. It is useful reach, but it also makes camera shake and poor technique much more obvious.
The practical limits
The maximum aperture drops from f/4 at 75mm to f/5.6 at 300mm. In bright daylight that is manageable, but it forces higher ISO or slower shutter speeds in cloud, shade and late afternoon. This non-IS version offers no help against hand shake, so use a faster shutter speed as focal length increases. It also lacks the quieter STM focusing of newer Canon budget lenses.
For a Canon APS-C DSLR, the EF-S 55-250mm IS STM is usually the more practical low-cost choice because it is lighter, stabilised and designed for that format. The 75-300mm still has one important advantage: as an EF lens it can mount on both full-frame and APS-C Canon EF DSLRs.
Who should consider it
It can make sense only when it is very inexpensive, in good condition and used mainly in daylight. It is not the lens to buy for indoor sport, birds at dusk or consistently sharp hand-held 300mm photos. A monopod or tripod can help with static subjects, but it cannot stop subject motion.
What you need besides the lens
Check the zoom action, front element and autofocus carefully when buying used. Canon’s product information lists the official specification.
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Check the Canon EF 75-300mm f/4-5.6 III on Amazon if the price genuinely reflects its limitations.
30-second decision
Buy it only for cheap daytime reach on a Canon EF DSLR. It can be enjoyable for learning telephoto framing, but the lack of stabilisation and slow aperture make the newer EF-S 55-250mm IS STM a better buy for most APS-C users.
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Marian Florinel Condruz