Hello,
I am thinking of using a 100mm filter holder:
kasefilter.eu
with 100x150mm filter:
kasefilter.eu
on a 95 mm filter size lens:
lens-db.com
Is the filter too narrow so that it will vignette? Should I use a 150x150mm filter (and relative filter holder)?
Thanks!
I am thinking of using a 100mm filter holder:

ARMOUR Filter Holder Set incl. CPL and 2 Frames
The Kase ARMOUR Filter Holder in the set is a very good start to your Kase ARMOR experience. The ARMOR filter holder and adapter are included. The…

with 100x150mm filter:

K100 Wolverine Hard GND 0.9 3 Stops 100x150mm
The Kase Wolverine K100 100x150mm Hard Grad GND 0.9 (3 f-stops/3 stops) graduated filter is ideal for shooting in difficult lighting conditions.…

on a 95 mm filter size lens:

Schneider-Kreuznach Super-Angulon HFT 50mm F/2.8 PQS
Wide-angle prime lens. Announced: September 1992. Production status: Discontinued. Maximum format: Medium format 6x6. Mount: Rolleiflex SLX. Fast speed. Floating element system. Built-in leaf shutter. Manual focus only. Automatic diaphragm. Heavy.

Is the filter too narrow so that it will vignette? Should I use a 150x150mm filter (and relative filter holder)?
Thanks!