Any reason (besides weight/size) to keep both the 14-42 II R and the 12-50

No, there is very little reason to own two standard kit zoom lenses like the 14-42 and the 12-50. Pick the one you like better and stick with that.

The 12-50 has a wider range, better macro capability and weather sealing (which doesn't count for much on your EM10 but will if you get a weather sealed body in the future), so it makes sense to go with the 12-50, unless you like the output of the 14-42 better.

 

Actually the output of the 14-42 II is much better in my opinion. Plus size and weight make it a no brainer on the EM10.

 

If your EM-10 and 14-42 came as a kit I might hang on to it for resale value. It won't be a big difference but expands those that might consider it. It's a nice starter kit.. And since they don't go for that much only you can determine if it makes a difference to you wallet.

But with the lenses you have I would sell the 14-42 before the 12-50 if I needed cash.

• 12 vs 14 is not much but is some
• the macro is nice
• the overlap from 12-50 / 40-150 means swapping a little less
• and you have small with the 14

 

I'm not particularly happy with the 12-50 IQ wise. I'm only keeping it at this point because of 12mm end and the weather sealing. I'm debating, though, on getting the O12/2.

I'm not sure about the 14-42, never used it.

 

You might want to check--B&H gave me 85 bucks for my Oly kit zoom for some reason . . .

 

I had the 12-50 and still have the 14-42IIR (though I don't use it much since getting the 14-42EZ Pancake) and while I did like the zoom range of the 12-50, I think that the shorter zoom ranges of the various 14-42 lenses make them a bit sharper. And while I do prefer the smaller lenses (hence getting the EZ Pancake while I already had the 14-42IIR), I did enjoy using the 12-50 on some vacations. But if I wanted a lens that size on my EM10, I would probably go for the 12-40 instead - obviously heavier but not much larger.