Testing a 3D Printed O.Zone Mark 8 Body for Mamiya Press Lenses
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
We recently printed a copy of an O.Zone Mark 8 camera body designed by @o.zone69 This body was made to accept Mamiya Press lenses and has a Graflok back to accept Mamiya, Graflex or Horseman 120 roll backs.
I thought it would be interesting to put the body through my normal testing procedure.
First I checked the flange to focal distance on the camera by installing my 90mm test lens and a focal plane fixture on the auto collimator. The first photo shows the star target as seen through the collimator and it is not quite optimally sharp. Moving the collimator lens very slightly (1mm) I was able to get the image sharp. Calculating the error (x) using the formula x= (90/300)2 x 1 I get an error of 0.09mm. This is a bit out of spec, the flange focal distance should be +- 0.05mm.
Also, the first video shows me rocking the camera a bit on a fixture and visible is a movement of 0.05mm. The second video shows a Mamiya Universal body on the same fixture while I attempt to rock it and there is virtually no movement.
So, this camera would not pass testing for a Mamiya Universal body. The errors could be caused by the printing process and might not be because of the design, more so a limitation of the hardware. We used a @bambulab_official P1S printer with a 0.4mm hardened steel hotend using carbon fiber PETG at 0.08mm layer height.
In any case, this camera really is made to be used with a wide angle lens, a 65mm or 50mm. And, with a lens stopped down these small variances would not be an issue. Overall I think it is a good lightweight, compact camera. Using anything over a 65mm I think I would prefer a Mamiya Universal body with a calibrated rangefinder.
