Originally posted by chaude ...if I were to keep 3 lenses it would be the 31mm, 50-135 and the 10-17mm fisheye (instead of the 12-24), it is a combo that excels in flexibility, and after defishing the FE, depending on the distortion it will roughly equate to something between 12-15mm on a normal UWA (personal experience, might not be true)
The DA10-17 @17mm defishes to the equivalent of about 12.5mm. A 10mm shot defished would be equivalent to LESS THAN 1mm!! (I just check my AOV calculator for that.) Downside is that such defishing introduces lots of distortion, and kills edge resolution. After defishing a 16-17mm shot, I find I must downsample by about 50% to keep the edges from looking too sh!tty.
I'll compare your choices to my first dSLR kit: DA10-17, DA18-250, and FA50/1.4, for the fishiness, the super-zoom-ness, and the Fast Fifty speed. But I also quickly found that this kit was limiting. My basic kit now includes those three, and a Tamron 10-24, and an old F35-70 sometimes, and some selected MF primes: 24/2 or 28/2, 85/2, 135/2.5. With money, I'd look for a Tamron 17-50 or 28-75 to carry instead of my F35-70. Such suit my needs. Everything I carry has its purposes.
If I translate your lens choices to my FF/135 FOV mindset, they would be 46mm, 75-200mm, and 15-27mm FE -- not unreasonable, but not comprehensive either. Those are respectively a 'normal' focal length, a good portraiture zoom, and a wide special-effect zoom. Are those all you need?