JAcosta wrote in post #6682390
If I had to pick a TS-E lens it would be the 45mm.
Me too.
In fact, that's what I have and use most on 1.6X crop sensor cameras.
I have the 24mm too, but it sees less use. If I shot more architecture, the 24mm would see more use, whether on full frame or crop.
If I had full frame DSLR, I'd probably want the 90 too. But I don't have full frame, so don't feel much need for the 90. I do have the 100/2.8 Macro, though.
For now, if necessary I'll just rent the 90 TS-E if/when it's needed, and build the cost into the customer invoice.
That's something the OP could consider too, if occasionally the 90mm is called for in his work. As a specialty lens, it's available to rent many places.
Alternatively, quite often all three of the TS-Es are available lightly used, too. The reason is pros buy them for a specific job (charging the cost to the customer, of course), then sell them off after the job is completed.
I bought both of mine used and save a bit. You wouldn't be able to tell them from new.
All that being said, back to the OP's question... I'd get the 100-400 now. For most people it would be a more generally useful lens. You can probably recoup a little of the cost by selling your current zoom, too.
