Kowa TSN-Twist-up locker set

For the best smartphone digiscoping results, it is often essential that the eyepiece eye relief cap is engaged to create a sweet spot between camera lens and eyepiece. Without engaging eye relief, digiscoping results can be dramatically reduced with increased vignetting covering the image. Applying eye relief removes this negative effect and the amount of eye relief depends very much on the individual lens of the smartphone. The major problem encountered by smartphone users when engaging eye relief on the eyepiece is that the weight of the smartphone and adapter puts increased pressure on the eye-relief cap resulting in the eye-relief cap slipping back to it”s default position. The set includes two locking rings, one thin and one thick. These rings can be used indivudally or combined offereing three variations of eye-relief depth from minium to maximum.