Re: If you could only have 3, 6, or 9 lenses for your M system?
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The results are very interesting, with a sample size of 11 so far.
Looking at the 'top 3' set only:
The Canon EF-M 11-22 IS STM is the clear favorite here, with all 11 people choosing it in their top 3! Not surprising - it's an amazing lens.
Also so far the trend is to include a zoom with telephoto coverage in the top 3, either the Canon EF-M 18-150 (5 people) or a dedicated tele zoom 55-200 (2), EF-S 55-250 (i), or EF 100-400 (1).
The other lens usually included is a fast wide-to-normal prime, either the EF-M 22mm (5) or the EF-M 32mm (3) or the 28mm macro (1) which can do double duty as a sharp normal prime and a great macro lens.
Interestingly the EF-M 15-45 and 18-55 kit lenses were the least popular overall, easily beat out by the versatile 'sharper' EF-M 18-150. They're not bad lenses --- just not as good as the others on the mount.
For me, it's just as interesting to see the 'outliers' that popped up. The EF 100mm f2.8L macro lens, Rokinon 8mm f2.8 fisheye, Rokinon 12mm f2 (great astro lens), Laowa 9mm, Rokinon 135mm (another great astro lens and low-light tele).
For me, recently I found that the Laowa 9mm was suprisingly good and useful and opened my mind... faster and wider than the 11-22 it really has something to offer. For me it bumped either the Rokinon 8mm f2.8, the Rokinon 12mm f2 lenses, or the canon 28mm macro off my 'top 9' --- and I really like those lenses!!
And occassionally I'll still stick the 15-45 or the 18-55 on a body to get 'wide' zoom coverage. I'm with R2... would not want to part with any of my lenses.