Whenever the new M is rumored also the new tele lens is rumored shortly after.
Especialy in this Forum I hear again and again that such a lens would make Little sense as by Definition such a lens Needs to be huge (compared to the camera) and that this misses the reason of existence for the M. Once that Argument is thrown into the Arena the usual comments either go towardes the 'I anyway just use the pancake' or 'please give me another Xmm pancake'
Now to come to the Point:
Does Canon not have this DO technology? WHy should they not decide to make a lens with the 'beauty' of the 70-300 DO I mean fat and short? Maybe the guys here who can calculate the feasibility of an optical system better than me can tell me what is possible or impossible. A EFM 55-200 DO IS 3,5-5,6 only 1 centimeter longer but 2,5 cm wider than the kit lens? DO would massaker the IQ but a System that would still fit in the pocket of a coat would be very sexy to me.
Apart from the issue of size, there is also the issue of duplication. One of the main selling points of the M is the compatability with EF and EF-s lenses.
An EF-m lens fits only on an M.
An EF-s will fit on Rebels, X0Ds and 7D.
An EF will fit on all EOS cameras.
The new EF-s 55-250 looks great for it's class and price, but obviously would need the adaptor..
Maybe canon should instead release a very low cost EF-s adaptor, maybe even plastic body and mounts, but with electronics.. £30 / $50? Strong enough for the EF-s lenses...
But then, would the 'intended' market of the M, powershot upgraders, want the hassle? Would they want the hassle of any interchangable lenses.
You see, here's the rub with the M. Canon made it for beginners or compact users. I think it's actually only the enthusiast and those already in the EOS system that it makes sense for.
They got it entirely wrong, but it's a good wee camera at it's core. I don't think I'll use it with anything other than the pancake tbh, it's just such a well sorted package, but to my mind the EF-m 18-55 makes little sense, bigger EF-m lenses even less so.
Cheap plastic adaptor is the way forward, the gateway to the decent enough EF-s lenses. Keep the metal version in the line up too, for folk with the more substantial EF lenses like the 200 f2.8L or 135 f2.0L.