Just moving my posts on shimming the Wide RS to a more appropriate place:
You can in fact shim the Cambo Wide RS, and quite easily at that - basically following the instructions for shimming the Alpa. What you need are a set of shims, such as those available
here (which are the plastic type, easy to cut and with good enough dimensional stability under temperature change and pressure). You then simply remove the four screws highlighted, which are set in bushings that allow the bracket that the adapter plate sits in to move back and forward), and insert the shims as required. Two of the screws are hidden behind the small plates that hold the adapter plate on, so you need to remove these to access them. The screws used in the bushings are M2 x 5mm. A useful trick is to use a dab of thread locker (blue for instance - easily removed if needs be) to fix the bushings in place (flush to the plate they sit in), and then when you tighten the screws they won't move and it will be only the shims that determine the fore/aft position of the digital back. Plastic shimming is available as thin as 0.0005" = 0.0127mm. This is really thin, probably not much more than the WRS (or Alpa or Arca) would expand/contract on a really hot/cold day (respectively), but if you think it makes a difference no harm using it. The thicknesses I bought were: 0.0005" (~0.01mm), 0.001" (~0.02mm), 0.0015" (~0.03mm), 0.002" (~0.05mm), 0.04" (~0.1mm), 0.0075" (~0.2mm) and 0.12" (~0.3mm)
Note, before doing all this check that you need to - see the optechs video on their website first. The way the rear plate on my Cambo was set up was perfectly parallel (well done Cambo) - but it did need moving back a fraction to match the position of the sensor in my DB. In this respect, the way Cambo have designed the rear of the RS is very clever, the bracket that the adapter plate sits in is infinitely variable (in respect of front/back movement) by adjusting the height of the four bushings and locking them in place with the internal screws (which you could just do in order to shim your back, but as I said above, plastic [or metal] shims are less hassle since they keep the bracket square to the camera).
In the picture of the template, all measurements are to the nearest 0.5mm but, in practice, to the nearest mm is about as good as I can get by using a craft knife. Not to worry though, because it's the thickness of the shim that's important.
Shimming material is available from:
In the US:
http://www.practishim.com/ ($50 min order I think)
In the UK:
http://www.cromwell.co.uk/PCN9653710Ahttp://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=0681407and many other places as well I'm sure.
