The RF75 filter system consists of 2-basic parts; the adapter ring which attaches directly to the lens using the filter threads and the filter holder which attaches to the adaptor ring and is held in place with a spring loaded plunger. The adaptor rings range in sizes from 39-67mm. The filter holder can be adapted to hold one or two 75x90mm filters along with an optional clip-on polarizing filter. I found I needed adaptor rings of 39, 46, 49 and 55mm to fit my Leica lenses however I a smaller ring for my Medium Format Schneider 72 and 120mm lenses and now use 2-step rings (40.5-52 and 52-55) which are then connected to the 55mm ring.
My Cambo lens kit consist of three, 35mm Schneider which has a center filter attached, as well as Schneider 72 and 120mm. I've used the Lee RF75 with great success on the 72 and 120mm lenses using the step-rings and found I get no vignetting.
I use a Phase One P45+ digital back to capture the images with the WRS. A technical camera allows the photographer to use movements thus making better use of the lens circle. While the lens itself remain stationary the back moves around the lens, left to right and up and down; these movements allow for multiple image captures with very little image distortion. The down-side is that the movement of the back on the rear of the lens can introduce color shifts however these can be easily fixed.
This is the result of 5-images shot in portrait mode, using the 120mm lens with the RF75 filter system attached (I used .9 and .6 neutral density filters to get a more dramatic sky). I was so intent on the placement of the filters that I completely forgot to double check the focus of the lens thus the image is ever so slightly out of focus.
The next entry addresses Bluff UT, Comb Ridge and Valley of the Gods in more detail along with images from Sandy's Canon 1DsIII and my Leica M9. We'll also be including at least one video taken from our new Ford Raptor showing the beauty of the area we drove through.