UnFstudio

just do it on the nikons - they are great lenses

just as a point of note on lenses for films :
David Fincher shoots most of the time with the same lens focal lengths even when he changes his DOP
so even if it is Jeff Cronenwerth, Harris Savides or Darius Khondji on camera for him he is still using a 27mm 40mm most of the time and a 75mm for the close ups , at f2.8 with nds and at f2 at night , thats about it , most of the film is shot on those 3 lenses thats all he needs
(page 162 of the book 'New Cinematographers' gives you a look at Harris Savides note book for the film 'The Game' he lists scene by scene what lens he uses and its f stop ....its mainly all 27mm 40mm 75mm at f2.8 or f2....
 
The late great Gordon Willis shot 90% of The Godfather series for Francis Ford Copolla on a 40mm f2.8 lens - if you get this months American Cinematographer magazine OCT 2014 its a special edition all on Gordon Willis - The Prince of Darkness and it reveals all on how he shot these great films .
 
Then you have Paul Greengrass who uses long zooms all the time and the late Tony Scott who shot almost always on long lenses and used x2 extenders too, thats his 'look '
 
And then the great Sergio Leone shot all those Clint Eastwood 'Dollar' series films on a single Angenieux 25-250mm f3.5 zoom
 
So my point is you dont always need very wide lens to make great films .....
 
as long as you have in Super 35 field of view a 28mm. 40mm and 70mm which the Nikon zoom gives you ,you can make a film.....what camera you use to get those lengths is upto you , you may need speedboosters or adapters but those are the numbers that work for me most of the time.

if you want lenses you can keep long term then dont buy micro 4/3 Rokininons
I would get a Nikon 28-70mm f2.8 IF D , it is a steller lens as used on THE BOURNE ULTIMATUM, CASINO ROYALE, QUANTUM OF SOLICE etcetc
no focus breathing , very sharp and covers the range of 4 primes , 28, 35, 50 and 70mm plus if you put it on a speedbooster it becomes a 20-50mm f2 monsters lens !! very fast for night shooting and even sharper and wider .
 
I have 2 of these and they are now my main go to lenses !!
 
you can shoot wide open at f2.8 all day long an it is pin sharp with a superb bokeh and very very filmic look
this lens is the closest you can get to a £15,000 Carl Zeiss 28-80mm f2.8 cinema PL mount lens
http://***URL removed***/articles/4439044609/carl-zeiss-presents-28-28mm-t2-9-cinema-zoom-lens
 
AND it has less focus breathing than the Carl Zeiss.....it is an amazing lens get one it will last a lifetime.
 
its sister lens is the Nikon  80-200mm f2.8 IF D also used on Bourne Ultimatum - this the is killer!!
 
with these 2 lenses and a speedbooter you can shoot 90% of a feature film!
all with a constistant glass look and matched colours so no issues in post as its all the same great Nikon glass !!
it works !