The super-tele zooms like the Sigma 150-500 OS and the Tamron 200-500 and good versatile lenses that give good reach and a nice range of focal length. The downside is that they are slower focusing than the big primes and tend to not have as good image quality, especially when shooting wide open. In good light they can perform very well but as soon as the conditions get worse they struggle. The zooms offer a relatively cheap way to get long focal lengths, as long as you work within it's limits you should do well with one.
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