Features of DP500 Mark III follow focus: Made of aluminum with CNC machine.Compact and lightweight. No backlash,steady.Rubber cover on handwheel soft and no-slip,bring better practice experience. Compatible with standard 15mm rail system.You can also buy an extra 19mm rod clamp for 19mm raill system. Multiple accessories for option: 5pcs of lens gears for option (M0.8-38T,M0.8-43T,M0.8-65T,M0.6-64T,M0.5-78T),extension arm,speed crank,speed whip (3"/5"/8"/10"/12"/15"/18"). Repeatable using mark ring. Lens gear can be mounted both side. Flexible gear belt,adjustable from 46mm to 110mm. No backlash,15mm rail rod clamp,rubber cover on handwheel,repeatable using mark ring Material: Made of aluminum with CNC machine Compatible with 15mm rail system.The 15mm rod clamp can be replaced easily.You can buy a 19mm rod clamp for work with 19mm rail system,or buy quick-ralease clamp. No backlash,handwheel tension can be adjusted by the underneath screw. Mark ring can be removed and replaced easily and quickly. Handwheel is with rubber cover.Touch soft,no slip.This would bring you better experience,especially in cold weather. Suitable for almost all cameras It is suitable for almost all cameras from mirrorless camera,dslr camera to cine cameras. An fotge 1:1 extension arm (not included ) is optional for ensure it able to work more cameras,like C100,C300.C500 series.Extension arm can be mounted both side of the follow focus. Compatible with speed crank and speed whip with standard 12x12mm terminal. Different lens gears for option There are 5pcs different size gears to meet your different need with various lens.(3 included in this kits) M0.8-38T gear: 38x0.8mm pitch,diameter is approx.28mm M0.8-43T gear: 43x0.8mm pitch,diameter is approx.32mm M0.8-65T gear: 65x0.8mm pitch,diameter is approx.50mm M0.6-64T gear: 64x0.6mm pitch,diameter is approx.32mm (not included) M0.5-78T gear: 78x0.5mm pitch,diameter is approx.38mm (not included) There also includes a 0.8 pitch gear belt,size can be adjusted from 46mm to 110cm. What's in the package ? 1 x Fotga DP500III Follow Focus 1 x Gear Belt 1 x Speed Crank 1 x 38T lens gear 1 x 43T lens gear (already installed on the follow focus) 1 x 65T lens gear Regular follow focus QR A/B stops follow focus 15mm/19mm QR AB stops follow focus kits DP3000 follow focus DP3000 single-15mm-rail A/B stops follow focus DP500 S.light3 Matte Box Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4.4 out of 5 stars 16 4.0 out of 5 stars 125 4.0 out of 5 stars 15 4.3 out of 5 stars 45 3.6 out of 5 stars 10 3.6 out of 5 stars 17 Price $99.00$99.00 $159.00$159.00 $300.00$300.00 $49.99$49.99 $49.99$49.99 $64.98$64.98 AB stops X ✓ ✓ X ✓ no data Backlash Zero Zero Zero Zero Zero no data QR clamp X ✓ ✓ X X no data for 15mm rail ✓ ✓ ✓ ✓ ✓ no data for 19mm rail X X ✓ X X no data Features no data no data no data no data no data Lightweight,durable,clip-on matte box.Compatible with 4x4/4x5.65/100mm*100mm filter and circular filter.