Everyone, even those really interested in cameras, cannot be expected to remember the specs of every camera. I try, and still I sometimes wonder things like “hmmh, I remember the X100 was a bit special, but what was it now?”
On another note, I would have very much liked if they told in this article what the effect this extra lens has on maximum aperture / t-stop. With between-lens-and-body adapters this is pretty much a known (because such a tele extender just spreads the light (already collected by the lens) to a larger area), but the same simple formulas don’t apply for front conversion elements.
(From an earlier DPreview article it seems that the extender has no effect in the f/2 max aperture. That is far from self-evident, so I think it would have been good to mention in this article, too.)
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.