Complex sentence: This model is often referred to as the gear coupled RF version due to the conspicuously placed gear next to the lens front element, the gear however, only provides a means of turning the front element using a finger on the edge of the wheel.
Split into simpler sentences: This model is often referred to as the gear coupled RF version due to the conspicuously placed gear next to the lens front element. The gear however, only provides a means of turning the front element using a finger on the edge of the wheel.