How do you tune a lens? I'm a novice photographer and bought the 18-400 a while ago. I'm happy with most shots, but sometimes feel they could be better/sharper. Love the lens, but now am wondering if tuning it will help any, but I've never heard of this before.

I bought the Tamron 18-400 for Nikon several months ago based on reviews from this group. I love the lens - it's great for shooting my kids outdoor sports, got some beautiful shots of my son's college graduation from across the arena, and use it as my walk around lens while hiking as it allows for great landscapes, close ups of the group and I can get nice wildlife photos from a good distance without the hassle of changing lenses.

I recently asked the same question about the Tamron 18-400. I also have the D3400, bought the Tamron about two months ago, and rarely ever use the other lenses...well worth the investment.

Sabino Canyon
Colasso Cave
Arizona-Sonora Desert Museum
Old Tucson

wow! Thanks everyone. This has been super helpful. I'll be heading to the local camera store soon to see if they carry it, and maybe I can try it out for a bit before buying.

I'm somewhat new at photography...I've been taking pictures of my kids sporting events and some landscapes for a long time, but recently decided to put more effort into the hobby. I have a Nikon D3400 with the 2 kit lenses. I'm looking for one lens that would be more versatile when hiking. I've tried the shorter lens, but found it doesn't cut it if there is something across the lake, or wildlife across the way or in a tree. Unfortunately the 70-300 doesn't cut it while hiking and there is something closer to capture. I'm thinking of getting the Tamron 18-400mm. Any thoughts on this lens, or is there something else that would be comparable and get the job done in multiple situations. Most times on a hike there isn't time to change lenses. Also, the longer range would give me even better sports shots.