Camera Tilting Unit (CTU) by G. Neumann jr. for M48 - Nikon
As the chips of modern CCD cameras get larger and larger it becomes more difficult to align them perfectly perpendicular to the optical axis and parallel to the focal plane. Often the sensor is not mounted accurately in the camera housing and this can result in uneven
sharpness and focus from one side of the sensor to the other, even
though it may appear that you have mounted the camera properly. Advantages of CTU
The Neumann CTU allows you to adjust the tilt of the focal plane very easily and very precisely. Similar units from other manufacturers usually have three pairs of push-pull screws at 120° and can be very difficult to adjust. Push/Pull screws are much too coarse and a lot of adjustment is done via elastic or even plastic deformation of the main body to achieve the required image plane movements.Mechanical details
In contrast, at the heart of the Neumann CTU are three radial screws with a very light cone shape formed at one end. By screwing these cones in, the two parts of the Neumann CTU are separated by a very small amount. A whole turn of a screw corresponds to a separation of only 0.2mm. Due to this fine movement and the large outer diameter of the Neumann CTU it is quite easy to adjust the position of the sensor to less that 1/100mm.
Both sides of the Neumann CTU are held together with three very strong packs of disk springs and secured with set screws. These springs provide a very strong holding force and also keep everything together. The overall tightness of the Neumann CTU is very high so if you mount a camera with a weight of less than 3kg to the Neumann CTU, you will not have to tighten the set screws (two for each radial adjustment screw). For use with heavy imaging outfits we added the set screws to be on the safe side but it is unlikely that even heavy camera assemblies will need them but should they be needed only very slight tightened should be necessary.
The CTU-Nikon has female M48x0.75 thread on one side and the Nikon bajonett on the other. Thus, you can mount all lenses with Nikon bajonett on your CCD camera and adujst the focal plane very carefully.Delivery contents
- Camera Tilting Unit M48 - Nikon
Camera Tilting Unit to adjust the tilt of the focal plane when using Nikon lenses with CCD cameras