Nowadays， follow focus has been more and more important device to control the depth of field. Here， we provide you with this 15mm DSLR FF A / B Hard Stops Follow Focus for Rail Rod Black to meet your need! With meticulous craftmanship and professional design， this follow focus will effectively control the focus of lens， which is more accurate and stable. With this wonderful follow focus， the video could make bokeh and theme.                                    Features            With A / B hard stops to control focal lengthQuick installationProvides quick and accurate focus， perfect for any photographerUniversal design， suitable for most DSLRsYou would have easy begin / end setups for fast repeatable racking between two pointsThose focusing lenses that have no hard stops (say Canon EF lenses) are now easily achievableYou could also pull focus anywhere as you like and easily track the previous lens position settingCompletely gear-driven design for slip-free， accurate， and repeatable focusingGear drive could be mounted from both sides; Suitable for industry standard 15mm rods                                                            Specifications            Material    PC !#!amp!*! Metal    <br>Weight    2.22 oz / 63 g    <br>Color    Black    <br>Dimensions    (7.09 x 4.33 x 4.33) " / (18 x 11 x 11) cm (L x W x H)    <br>Compatible with    Camera     <br>                                                            Package Includes            1 x DSLR A/ B Follow Focus <br>1 x Focus Ring<br>