Hey guys, I am about to buy a Canon 50mm 1.4 lense for my T2i and was wondering if anyone out there knew what is the diameter around the focus ring of the lense. Because I am going to buy a follow focus and was wondering what size gear ring to buy. Thanks you.

Good question. I know the Lens Filter size is 58mm but is that the same diameter you would need for the gear.

I dont think so. I plan on buying the lens then measuring.

Michael, I have that lens and there is no information anywhere on the measurement of the focus ring, I just bought the D-Gear from Jag35 in that's supposed to work with any follow focus, D|Gear | Jag35.com (http://jag35.com/new/products/dgear/)

Here are a few Canon Diameters

Canon EF Lens Diameter mm
14mm f/2.8 L 75mm
16-35mm f/2.8 L 76mm
16-35mm f/2.8 L II 76mm
17-35mm f/2.8 L 76mm
20-35mm f/2.8 L 77mm
20mm f/2.8 75mm
24mm f/1.4 L 80mm
24mm f/2.8 67mm
28mm f/1.8 73mm
28mm f/2.8 66mm
24-70mm f/2.8 L 84mm
28-70mm f/2.8 L 83mm
24-105mm f/4.0 L IS 82mm
35mm f/1.4 79mm
35mm f/2.0 67mm
50mm f/1.8 65mm
50mm f/1.4 74mm
50mm f/1.2 86mm
50mm Macro f/2.5 67mm
100mm f/2.0 75mm
100mm Macro f/2.8 75mm
135mm f/2.0 76mm
85mm f/1.2 92mm
85mm f/1.8 75mm
70-200mm f/2.8 L 83mm
70-200mm f/2.8 L IS 86mm
100-400mm f/4.5-5.6 L IS 90mm
200mm f/2.8 L 75mm

Good stuff.

john

Hey Michael Rees,
A bit out of subject: I am also tempted to buy this lens, but I'm still comparing this one and the Sigma 50mm 1.4. When you'll receive it could you give us some feedback? Thank you

I use my 50 1.4 with the ProAim FF from DV City...works great! And it comes with enough gears for a bunch of lenses. Get the V3 reversible.
DV CITY - DV CITY (http://dvcity.com/dve/index.php?cPath=72)