Canon EF 75-300mm f/4-5.6 STM

The Canon 75–300mm range represented by this cluster is a budget-friendly telezoom family that delivers long reach for general telephoto needs. The variable aperture from about f/4 at the short end to f/5.6 at the long end is common in consumer telezooms and reflects a design trade-off that keeps physical size, weight and cost down. The cluster tokens include IS and STM indicating that image stabilisation and a stepping motor autofocus system are present on the variant referenced; STM provides quieter and smoother AF operation that benefits video capture and quieter stills focusing. The III token suggests a later generation or revision of the design. Lenses like this are useful for travel, hobby wildlife, sports at a distance and outdoor photography where affordability and reach are priorities over the fastest apertures or the last stop of optical performance. Buyers should consult the linked reviews and manufacturer pages for details on autofocus speed, optical sharpness across the zoom range and handling before choosing a specific variant.