The Geronars are a budget Rodenstock lens - while they produce quality images, they have much smaller image circles than their bigger cousins, resulting in constrained camera movements. They are also not as fast, so the image on the ground glass is less bright, making them a little trickier to focus. On the upside, they are much smaller, making them well suited to landscape and travel photography where lighter weight could well be an acceptable trade-off for the reduced image circle.