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The Canon EOS-M crop sensor system has no native long lens, zoom or prime.
The longest is the EF-M 55-200mm which is equivalent to 88-320mm in full frame equivalents.
However EOS-M cameras can use EF and EF-S lenses via an adapter with reportedly good functionality in most cases.
So I have been using an EF 70-300mm f4-5.6 (Mk2) IS on my M50 with decently good results for both image quality and performance, including the stabiliser.
The issues I have with the 70-300mm are:
* It feels rather large on the little M50 and I had to get a new camera bag to fit it.
* Autofocus us accurate but not as fast as a native EF-M lens like the 18-150mm. As a result, my keeper rate for birds in flight is very low with most shots missing focus. The combination is really not one I can recommend for BIF.
But for static subjects or those moving at a modest and fairly steady speed the results are just fine.
All the shots here were hand held.
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| The buildings are about 4 k away across water |
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| One of the few BIFs which I did get reasonably sharp |