Tag Archives: Fuji

Building a technical camera – Part IV

20150322_130154Step 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.

DSC01151First 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.20150404_192705

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. 20150404_192717

To make sure the parts were perpendicular, I used the precision of the milling machine and an indicator, see below:

20150404_192732

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:20150404_193117No a few photographs of the camera with the rail system, where you can see how left/right shift will work:

DSC01173 DSC01171 DSC01164 DSC01160 Next step:

Drill the rear standard support (part with the two knobs in the pictures higher).

Conclusions:

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.

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Building a technical camera – Part I

$_57Fuji GX680 III basic body with rear and front elements and bellows. Missing lens, film back and viewfinder.

Step One of Building a technical camera

I have a new project: the ultimate DIY camera fun.

After much discussion with my buddy Satoru Murata, I decided to take on a project for the next few weeks. I will share with you some of the steps I will take into building a technical view camera… of sorts.

For those who are not familiar with such cameras, you can find a description here and a sketch below: http://en.wikipedia.org/wiki/View_camera

In a few words, this camera is made of a front board which holds a lens, and bellows that ensure the image coming from the lens goes without interference to a back element containing film or a digital sensor (there are also other types of capturing media but no need to go into such details here). What makes this type of camera special is the ability to move the front (and back) element in order to obtain large amounts of tilt and shift.

If you have been following me for a little while, you know that I use tilt and especially shift in my work, and sometimes using such special lenses in particular situations (for instance when you find yourself very close to the subject). For those who are into technicalities, another limitation of regular modern style T/S lenses is that movement happens at the front of the camera and not at the back. Back movement is however preferable because moving the front element changes the position of the image circle, and it usually is better to tilt (in particular) the rear element rather than the lens in order to avoid such changes in image circle position.

Now, you also now that I use Sony cameras for my work, as well as different sorts of lenses, ranging from modern and old Full Frame lenses to 30-ish years old Medium Format lenses (and I even also do Large Format film for fun). All these lenses are great, and MF provides a larger image circle, meaning that I can do larger movements than with FF lenses. Unfortunately, none of the adapters available on the market allow for full access to the MF lenses image circle, and some of them simply cannot be used, period (such as Mamiya RZ67). It is also impossible to use LF lenses on modern FF or MF dSLRs and backs.

So here is the idea: build a technical camera that will let me mount ANY (and I insist on ANY) lens (FF, MF, LF) on a modern digital FF mirrorless dSLR or MF back, and give TILT and SHIFT movement both at the front and back elements.

After some research online, I found that people can hack a Fuji GX680 body into doing something like this.

So I present you a new member in the family: a cheap (~$200 USD) Fuji GX680 III body which I will start stripping off its different elements in order to keep only the base body and moving elements.

$_573245Next steps to come, after I removed all the unnecessary parts! 🙂

On a different note, I’ll need to find this camera a name after it’s finished… let me know if you have suggestions! 🙂