This is a paste of another post.....that is @.....I do have better, but it popped up first.
I do call a bumpy, lumpy line feathering. ....later a woolly line. And it is not just a nib problem, but if as in this case many different inks are used on good to better ppaer, it can well be a nib problem....like on the post 97 Pelikan 400/600/800/1000. The 200 still has a clean line, like the rest of the '82-97 or '50-65 era nibs.
In this case it could be a fat and blobby Lamy nib, just like those Pelikan nibs....sometimes a hand made and they still make them in the second floor of the factory on antique .....'60-70's machines.
I don't think Lamy 2000 has a reputation of making a fat and blobby nib.
IMO, a lumpy, woolly line is first stage of feathering....the last stage is real feather threads running off at angles into the paper, like with Ink Jet paper...............others might have another term, I don't know, for a non smooth; lumpy, bumpy non paper caused line.
There are inks that show that behavior, and others that have a clean line on the same paper, with @ the same nib width and flex.
Does it have to do with how wet a nib is?....semi-flex is a wetter nib.That I believe is more an ink problem than a paper problem.
Lamy ink is a dry ink.....so the 2000 could be a wetter writing nib to match up to the dry ink......like Waterman made a narrow nib for a wet ink.
But even so, I'd not compared a dryer writing regular flex with a wetter semi-flex...having noticed the difference nearly a decade ago. & have no need to cheat. Nor do I even want too, I'm looking for a clean line. With good paper I can get a clean line with semi-flex...or regular flex....or even a nail.
I've used good to better papers over the years for testing..........minimum is Oxford Optic90g/Red&Black notebooks paper, or Clarefontaine Velote 90g. Both are equal to each other.
50-100% cotton swallows shading and increases feathering. Rossler 120g was so delightful to write on it would be illegal to write on it on Sunday in Kansas.....but feathered (and bleed like mad) too much to ever buy more than a sample sheet. Same with all Rossler papers. Still got some of the ten sheets I bought of various ones...be a shame to stick them in the printer....might as well, won't write on them.
(Very much dislike the feathering Brunner papers...all, (even the deckle paper ) outside their M&K papers )
I find 25% cotton on the whole to be good paper for shading and don't feather/woolly line much.
In feathering/woolly is often an ink problems, that the wrong paper can make worse....a good paper can cut it down ''''some''''. IMO, even a great paper won't turn a feathering BEF into a Mag F. I would think a great paper would turn BEF into NEF not more.(More detail on my system of woolly lines later.)
I really got to read up on dilution of an ink........want to save that Pelikan Aventurine, perhaps I can turn my few Diamine/Akkermann inks into users with dilution.
Howsoever I'm OCD/AR on feathering.
BEF....bare eyed feathering/lumpy line....seen while sitting....like Diamine. (Yes with over 200 inks there must be some that can pass the BEF test.) Yet....I have seen very many ink tests on the Com, (Including Diamine or Akkermann) where they do not show (tell or perhaps know) in the form that it feathers ; and it is obvious in the pictures of the ink in it's test, that the line is uneven...lumpy...bumpy line., that is feathering. It is not a clean line.
There are many other inks other than Diamine that are only good at BEF level. Pelikan Aventurine ... (Got to try that ink on the Rhodia 90g or Triomphe....I do like the color of the Pelikan Feather Champ.)
Outside noticing the differences of nib and paper....I was not and am not into false judging of an ink (by maker), pen nor paper. I want a clean line, as clean as possible.
NEF....near eye feathering/lumpy or woolly line....seen while looking at it near my eye. Looks just about OK while sitting. There are many like that. When one takes a close look, it shows feathering/woolly line. No clean smooth line.
With a Big Honking Magnifying glass.1 1/2 inch by 3 x 4 inches or 2.7 by 7 1/2 x 10cm. (No you can't use your 10X loupe...everything has a woolly line under that.)
Mag F...what I'd consider a descent ink....if I like the tone, I will buy it again. Feathering/woolly line can be seen under magnification only.
NoMAG F.......great ink ...buy more...buy stockin the company. No feathering/woolly line at all, even when looking through the big, thick magnifying glass.