I have a pdf of the Rollei RF system- can't post a pdf it seems, but I will quote:
"Sonnar 40mm f/2.8 HFT
The famous candid lens of the legendary Rollei 35S. The ideal focal length for indoors and out. A lens ideally suited for news photography. Its initial aperture of f/2.8 gives it a wide margin for shooting in low light with excellent results.
FIlter thread: M 39
Specs:
Aperture range: f/2.8 - f/22
angle of view, diagonal/horizontal: 54.9°/46.8°
optical system: 5 elements/4 components
focusing: 0.7 m - infinity
diameter: 51 mm
length: 30.5 mm (w/o lens hood)
weight: approx. 175 g
filter size: E 39"
I can send you the pdf of the whole brochure (2.1 MB) or just the lens info trimmed out of it (180 KB).
WIll have to be tomorrow afternoon, I've got to get packed for tomorrows sunny day!
added- I haven't shot with this lens, longed for it, but have the hood & VF for my 40 'cron (the 'cron was cheaper). They are the CV pieces I believe- and are quite nice. The VF is bright, the hood metal and extremely nicely finished.