Scientific Anglers Amplitude Smooth Infinity Taper Fly Line – Standard
SA AMPLITUDE SMOOTH INFINITY STANDARD OPTIC GRN/MIST
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’ll be able to do with it.
- Excels in medium-to-long distances with dry flies and smaller nymphs; wonderful on glass and bamboo
- The best smooth, true-to-grain-weight line for casting small dry flies to picky risers
- Designed specifically for chasing trout; also useful for grayling and panfish
| Specification | Value |
|---|---|
| Weight | Half-size heavy |
| Taper | Long head with substantial front taper |
| Best Use | Dry flies, small nymphs, trout, panfish, pike, steelhead |
| Material | Optic green/mist |
FAQ
What makes the Amplitude Smooth Infinity different from other fly lines?
It combines strong casting power with smooth delivery for delicate dry flies, featuring a long head and substantial front taper that performs well over medium-to-long distances.
Is this line suitable for fishing in still waters or moving streams?
Yes, it performs well in both still waters and moving streams due to its balanced action and smooth mending characteristics.
Can it be used for both dry flies and nymphs?
Yes, it excels with dry flies and smaller nymphs, making it versatile for a range of fly fishing situations.


Alan Wallace –
This line is a game changer for dry fly fishing. I’ve used it on trout streams and it casts smoothly even with small dry flies. The mending is excellent and I can reach far without losing accuracy.
Sam Carr –
Great for both trout and panfish. The front taper helps with long casts, and it doesn’t tangle easily. I’ve been using it for a month now and still love the performance.
Lily Terry –
Solid line for medium to long casts. A bit heavier than expected, but works well with small nymphs and dry flies. Slight improvement in wind conditions would be nice.
Nathan Mackay –
Perfect for glass and bamboo rods. The smoothness and power balance make it ideal for chasing trout in clear water. I’ve never had a line perform this well.