Leitz ROSOL viewfinder lanthar up to 20fps shooting with

up to 20fps shooting with autofocus

The 3 Legged Thing x1

but not enough to affect viewing (worth noting that these never had the world's brightest viewfinder to begin with

with the insert

Leitz ROSOL viewfinder lanthar up to 20fps shooting withThe Leitz ROSOL is an open frame sports finder for 50mm, 90mm, and 135mm lenses. Mounts to your Leica's accessory shoe and provides a less restricted (and less accurate) view than what you'd get from the camera's built in viewfinder or optical viewfinder accessories. In excellent cosmetic condition overall, with only very light finish wear on viewfinder uppers, more visible wear on the base of the foot.