Recommended a good versatile lens.

[Michael Clark]

I would recommend for land and seascapes
a) Canon 10-18mm (67mm filter thread)
b) Canon 70-200 f/4 (67mm or 72mm filter thread)

I would recommend screw on Neutral Density (ND) and Circular Polarizer (CP) filters
For ND (3, 6 and 10 stops) I would recommend either Hoya (ProND 8, 100, 1000) or Breakthrough (X4-ND 3, 6 and 10-Stop)
For CP, I would recommend Breakthrough or B+W XS-Pro Kaesemann.

I would recommend getting two sizes for 67mm filter thread and 82mm thread with couple of good step-up rings to adapt from (58-67mm, 62-67mm, 72-82mm, 77-82mm, etc)

I'd recommend going with a decent 100mm filter holder and 100x150 mm graduated ND filters, which are far more useful for seascapes and landscapes than screw-on GNDs. GNDs in general are better for landscape than straight NDs. You can get CPLs that fit the 100mm holder, too. Then the only thing one needs each time they get a lens with different thread sizes is an adapter ring for the holder.

 

[dickgrafixstop]

Buy the Canon 10-18 for ~$300, and add another $100 for ND and polarizing filters, a good tripod with a pan head and you've still got nearly $1000 for other "stuff". I'd save that money until the R line is a little more complete before making a big investment in new lenses.

 

[Hector1970]

Buy the Canon 10-18 for ~$300, and add another $100 for ND and polarizing filters, a good tripod with a pan head and you've still got nearly $1000 for other "stuff". I'd save that money until the R line is a little more complete before making a big investment in new lenses.

24-105 was my first L.
Which is like 38 to 168mm on a ApS-C. It was a huge step up in terms of image quality. A second hand version would be fine and last you years.