I dont use full frame so Im not quote full frame equivilants Im quoting actual focal lenths the speedbooster creates
it is a very very good lens - a hidden gem - Canon got the glass on this lens just right
with a speedbooster is the Full frame approx equivilant of 50-100 @ f2.8 which is a steller range to work in , 50mm being a 'standard lens and 100 range is right through to portait - this lens has little or no distortion suberb rich colours and nice solid blacks - and is sharp !!
win win win !!
see Ken Rockwell review here
http://www.kenrockwell.com/canon/fd/35-70mm-f4.htm
quote from Ken Rockwell
The 35-70mm f/4 is unusually sharp right out to the corners, even wide-open, and has little or no distortion throughout most of the zoom range.
The Canon FD 35-70/4 is also built tough; it's almost all-metal.
The Contax Zeiss Distagon 'Hollywood' 28mm F2.0 is a classic fast wide for full frame and is incredible on Super 35mm as well. Wide open it's one of the sharpest F2.0 wide angle lenses available and it has very little distortion.
The Contax Zeiss version fetches $800 on eBay but there's a $60 wolf in sheep's clothing called the Pentax PK 28mm F2.0 which has a fascinating story behind it.
[url=http://www.eoshd.com/content/10730/60-pentax-thats-actually-a-800-zeiss-with-optics-by-designer-of-stanley-kubricks-nasa-glass]Read the full article here[/url]
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