Canon EF-S 55-250mm f/4-5.6 IS STM

Pros

• Exceptional value for the price, often cited as the best 'cheap' telephoto option
• Impressive sharpness that users have compared favorably to much more expensive lenses
• Quiet and smooth STM autofocus motor suitable for both stills and video
• Effective image stabilization (IS) that aids in handheld shooting at longer focal lengths
• Lightweight and well-balanced on smaller camera bodies like the M50 or R100

Cons

• Limited to APS-C (crop sensor) cameras; cannot be used on full-frame bodies
• Maximum aperture of f/5.6 at the long end limits performance in low-light conditions
• Some users report the lens can appear 'soft' when paired with very high-resolution sensors like the 33MP R7
• Autofocus speed may be insufficient for high-speed professional sports or very fast-moving subjects

Caveats

• Users strongly emphasize getting the 'STM' version specifically, as older non-STM versions are considered inferior in image quality and focus speed
• Requires an EF-to-RF adapter to function on newer Canon mirrorless R-series cameras
• Primarily available as a used item now, with a common secondary market price around $150

Best for

• Beginner wildlife and bird photographers on a budget
• Hobbyists looking to expand their kit beyond the standard 18-55mm lens
• Users of Canon Rebel series, 70D/80D/90D, or adapted mirrorless APS-C bodies

Avoid if

• You use a full-frame Canon camera (e.g., 6D, 5D, EOS R6)
• You require a very long reach for professional-grade wildlife photography
• You primarily shoot in low-light environments without a tripod