For an inside passage Alaska cruise in June 2022, what telephoto lens would forum members suggest? I plan to shoot mostly from the ship, but might take a few shore excursions for wildlife. I have the 135/1.8 Sigma, but would that be long enough for shots of glaciers from the ship? I find that I can crop the 135 to about a 300mm equivalent with decent results, but think I will want something longer. Should I get a 100-400 or something even longer? As my budget is limited; I have ruled out something like the Canon 100-400L-II, even if used. I am considering the Sigma 100-400 which seems to give image quality similar to the Canon at about 1/3 the cost. I also have the Sigma 18-300, but its image quality is not great.
What do forum members suggest?
Note - my camera is a crop-sensor 80D.
Note - I don't want to consider renting the lens, as I will want to keep it after the cruise.
Another vote for the Siggy 150-600. Surprisingly good especially for the cost. I have both the Canon 100-400 v1 and the Sig 150-600 and prefer the siggy. I hear that the new Canon 100-400 is better but not at 600. 






