Ed Bray
Established
Thomas and Roland, both of you have inspired me to do this with my 50mm f1.4 PKM, I wonder if either of you would have some of dimensions required or how you would calculate them, such as:
a) the diameter of the tube
b) the diameter of the bore of the tube
c) the total length of the tube
d) the diameter of the step of the tube both inside and out
e) the depth of the step
Would the optimum focusing distance not be circa 3 mtrs (for 'environmental portraits')? infinity should be easily taken care of by using depth of field, if so is there a way of calculating the length the tube would need to be to give this figure?
To adapt my adapter to bring up the 50mm framelines would I need to grind away 1mm from the sloped area to give a depth of circa 2.5mm instead of the 3.5mm it currently is (which brings up the 35/135mm framelines)?
TIA
a) the diameter of the tube
b) the diameter of the bore of the tube
c) the total length of the tube
d) the diameter of the step of the tube both inside and out
e) the depth of the step
Would the optimum focusing distance not be circa 3 mtrs (for 'environmental portraits')? infinity should be easily taken care of by using depth of field, if so is there a way of calculating the length the tube would need to be to give this figure?
To adapt my adapter to bring up the 50mm framelines would I need to grind away 1mm from the sloped area to give a depth of circa 2.5mm instead of the 3.5mm it currently is (which brings up the 35/135mm framelines)?
TIA