Promaster 5125 Power Grip - D600/D610

The vertical shutter button sits exactly where my thumb expects it, and the AF-on button has been a lifesaver for back-button focusing during long event shoots. It feels rock-solid on the D610, no wiggle at all, and the main command dial is perfectly placed for quick aperture changes.

The extra command dials make adjusting settings on the fly feel just like using a second camera body, and the build quality is surprisingly solid for the price. It's transformed how I shoot portraits—no more awkwardly reaching for the main shutter button.

Finally got this for my D610 and the alternate shutter-release button placement is a total game changer for portrait shots. Battery life feels endless now with the extra slot, and it locks on securely with no wobble. Exactly what I needed for long shoots.