Step Four of Building a technical camera: adding left/right shifting to the back element
Last time, I showed you the results of milling out a chunk of the back element of the Fuji camera. Today, I’ll show you why I did it, and how to mount different parts together and insure they are perfectly parallel or perpendicular to each other.
For that particular step, I bought a cheap Chinese precision rail system on eBay. For $8 USD, it’s hard to get a better system that can be modified, drilled, cut or tapped. The following picture shows you exactly what this part looks like before modifying and mounting on the camera.
First step was to take apart the rail itself (with the screw sticking out of the slot), from the support piece that is originally meant to attach on the tripod head. In the final design, the parts will be flipped: the rail will become the support (attached to the camera, see below) and the other part with the precise movement knob and the stopper. The latter part will be modified so I can attach a support plate for the camera.
You will find below a few pictures that I shot while adjusting the rail to the camera so that these two part are perfectly perpendicular to each other. This step is very delicate, because the slightest misalignment between them will lead to the sensor plane not being perpendicular to the lenses, effectively creating unwanted tilt.
To make sure the parts were perpendicular, I used the precision of the milling machine and an indicator, see below:
Just so you have a better sense of what things will look like eventually, here is a photograph of the back element with the inverted support part that I’ll drill and tap in order to mound the camera standard:No a few photographs of the camera with the rail system, where you can see how left/right shift will work:
Drill the rear standard support (part with the two knobs in the pictures higher).
1/ this was one of the most delicate but easiest steps so far. Easiest when you have the right tools, but these are hard to come by and even harder to let a machinist let you use his toys 🙂
2/ I found a solution to add rear swing (left/right tilt) by ordering a precise optical rotating stage for about $80 USD from China. I’ll give you the details in a later post if you are interested (please use the comment below if so). I’ll first work on a prototype that won’t have swing, see how it goes and then add the rotating stage.