Knife Review: Extrema Ratio Panthera

The Extrema Ratio Panthera is a further development of their T-Razor (that was based on the traditional straight razor) and maintains all the characteristics of the T-Razor, but with a new wharncliffe blade shape and curving claw-like appearance. In this Extrema Ratio Panthera review, I cover all the technical specifications, detailed galleries to show you all the details, a video overview and demonstration of the opening method.

Video Overview

This video is a detailed look at the Extrema Ratio Panthera, from handling to technical measurements. Hopefully something for everyone and you should have a better idea if you should also pick one up.

The packaging:

A good look round the Panthera – Enjoy all the details:

The Blade and Handle – Detailed Measurements:
For full details of the tests and measurements carried out and an explanation of the results, see the page – Knife Technical Testing – How It’s Done.

The blade is made from N690 steel.

The Factory edge up close – NEW FOR 2022!:

Followers of Tactical Reviews will know my views on factory edges, but to recap:

Anyone using a knife will need to sharpen it. That first factory edge is just like the first tank of fuel that a new car comes with (or first charge of the battery).
A good factory edge is a ‘nice to have’ but not a ‘make or break’ for a good knife, as you will be putting your own edge onto it soon enough.
The factory edge does however indicate the care a knife maker has put into the final finish.
It is for this reason Tactical Reviews measures factory edge sharpness and specifications, and includes this information in the detailed technical testing.

As a further look at the factory edge, this section has been added to include some high magnification photos of the factory edges.

What is it like to use?

One of the distinctive features of the Panthera (and its sibling the T-Razor) is the extended tang used as the blade opening lever. This is the same style as with a friction folder (which being of Roman design actually predates the straight razor by around 1600 years), and allows both opening of the blade, and holding it in the open position. The Panthera also has a liner lock, so the tang is not used to keep the blade open, only to open it in the first place.

Of course the other striking design feature is the curved claw-like blade used in the Panthera, which makes it stand out.

It’s a big knife. I take XL size gloves and the Panthera is a real handful, just take a look at this set of photos.

The opening method is shown a few times in the video at the start of this review, but here are a set of photos to step through opening the Panthera using the T-Razor speed style of opening.

Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

What doesn’t work so well for me

No pocket clip.
No case or holster (in lieu of a clip).
Tang opening doesn’t suit everyone.
Lock release is a bit sharp to push on.

Things I like

Striking and impressive knife.
Curved blade can increase cutting power for many tasks.
Very comfortable grip.
Blade opens quickly (once you are practiced).
Long handle allows for multiple grip positions.
Matte anodised handle finish feels great.

Discussing the Review:
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