Scientific Anglers Amplitude Smooth Infinity Optic
The Amplitude Smooth series of lines are, simply put, the highest-performance smooth fly lines in the world. With up to five times less drag and eight times the durability of traditional lines, this will change the way you look at fly line performance.
The conventional wisdom in fly fishing is that there’s no such thing as a “do it all” freshwater line. We have something to say about that. The Amplitude Smooth Infinity has the power to bomb out streamers, yet retains delicacy for dry flies. It mends like an absolute dream, and delivers flies at all distances. Built a half-size heavy, with a long head and substantial front taper, it’s perfect for everything from trout and panfish to pike and steelhead. There’s a reason we call it the Infinity: there is no end to what you can do with it.
Specifications
| Parameter | Value |
|---|---|
| Line Type | Smooth Fly Line |
| Weight | Half-size Heavy |
| Drag Reduction | Up to five times less drag |
| Durability | Eight times more durable than traditional lines |
| Performance | Effective for dry flies and streamers |
| Head Design | Long head with substantial front taper |
FAQ
What makes the Amplitude Smooth Infinity different from other fly lines?
It offers up to five times less drag and eight times the durability of traditional lines, with excellent performance for both dry flies and streamers due to its long head and substantial front taper.
Is this line suitable for all freshwater species?
Yes, it is designed for use with trout, panfish, pike, and steelhead, making it versatile across a range of fishing conditions and targets.
How does the mending performance compare to other lines?
It mends like an absolute dream, providing smooth and reliable transitions when casting and retrieving.

Thomas Black –
This line has completely changed my fishing experience. I use it for both dry flies and streamers, and it performs exceptionally well in both scenarios. The drag is minimal, and it holds up well even after repeated use in rough conditions.
Luke Fisher –
I’ve tried several lines before, but the Amplitude Smooth Infinity stands out. It’s smooth to cast, mends easily, and handles both delicate dry flies and heavy streamers without any issues.
Gabrielle Paterson –
Great for a variety of fish. I use it in streams and lakes, and it’s especially effective when targeting larger species like pike. The durability is impressive after several seasons of use.
Kylie Morgan –
The balance between power and sensitivity is perfect. I can cast long distances with confidence and still have fine control when landing a dry fly.
Maria Chapman –
It’s a solid all-around line. I appreciate the reduced drag and the way it performs in windy conditions. A bit heavier than I expected, but that’s fine for my fishing style.