Did Tiffen change the name for the strength of Ultracons?

[Sune Bang Ingemann]

I found a reseller that has the strengths 1, 2, 3, 4, and even 5, the filters might be quite old. On Tiffens own website I can only find from 1/8 to 1. The strength 5 seems so strong that I find it hard to believe that it was ever massed produced. I was wondering if they used to go the strengths 1-5, instead of 1/8 to 1? I'm looking for 4x5.65 sizes btw. 

Best regards

[Stephen Sanchez]

Oh yes, they go to 5. Which I imagine is quite a dense effect. I have a set of Low Cons from 1/4 up to 4 and that is dense.

Fraction sizes are available. B&H Ultra Con 1/8.