If you can try it in the store, to ensure that it's a good lens the DA*16 - 50.
If not the DA*50 - 135.
Both if you can afford it. And possibly a second body, if you can afford it or borrow one.
We usually use larger bait fish. Some chumming in the water helps too. But if you really want to use a lens for shark fishing I would suggest a very cheap off brand... It will get filled with water so you dont want to waste a good one...
How do you attach the hook to it though???
Some may suggest a sealed DA lens...but that is one expensive lure. It might not fill with water, but you could snag it on the bottom and loose it.
I'd also consider the Sigma 10-20 w/ some plastic wrap. On a deep sea fishing boat, you don't exactly have much room to back up with.
First choice would be the DA*16-50 assuming you get a good copy...
Going shark fishing off Cornish coast (UK) in a couple of weeks. Likely to be rough windy and wet.
What weather sealed lens would you recommend to complement my K10D?
I use my 16-50 for sharking and any other sportfishing applications. 16mm is wide enough for most cockpit shots, and the 50mm allows you to zoom in on some of the near boat action without being too close to the business end of the shark.
Placoid scales are found in sharks and rays, and can vary greatly in external appearance. They do not increase in size as the fish grows, instead new scales are added. Placoid scales are often referred to as denticles.
Placoid scales consist of a flattened rectangular base plate which is embedded in the fish, and variously developed structures, such as spines, which project posteriorly on the surface.
Placoid scales are found in sharks and rays, and can vary greatly in external appearance. They do not increase in size as the fish grows, instead new scales are added. Placoid scales are often referred to as denticles.
Placoid scales consist of a flattened rectangular base plate which is embedded in the fish, and variously developed structures, such as spines, which project posteriorly on the surface.
What weather sealed lens would you recommend to complement my K10D?
Nikkor 35mm f/2.5, attached to a Nikonos IV-A body. Waterproof, rugged, works above or below water, aperture-priority metereing, and now relatively cheap. Perfect complement to a K10D for wet and dirty work when there's no real need to use the dSLR.