LTR, no go.
Try bolex instead, spring motor bolex not the el model, el has 170 shutter.
Bolex has the shutter angle of 130.
And I think you can close it a bit more, there is a 1/2 and 1 option on the camera.
1/2 closes it to 65, and 1 will close it to 32-35 depending on the model.
Also I think bolex rex-1 will have starting shutter of 145 angle but that doesn't change things much. Also if you plan using the same lens on LTR and on bolex be sure to test the lens for back focus issues.
Regarding polycontrast filters ranging from magenta to yellow-correct me if I am not right on that, they are made for polycontrast b/w papers.
Polycontrast papers have multiple layers and you activate contrast layers by exposing the right one using the right color and thus they will give you the right contrast.
So if you want to make magenta or yellow go a little bit whiter use them.
hey, mail me instead and send me your instant messenger nick
Let's continue this discussion (if you want to), in the section by where this topic belongs to.
Best, keep warm Apu
Take care!!