Quote Originally Posted by waynecrider
Please divulge your resource. Btw, I have a 135mm Optar that will barely give me much movements, at least untill I rack the bellows out, but then I'm not at infinity.
The source is the link posted above by Troy Ammons.

I'll paste here the data sheet of the 127mm for your convenience:

127mm f/3.5 Specifications
Optical Construction 6 elements/4 groups
Angle of View 39
Diaphragm Automatic
Minimum Aperture 32
Shutter Seiko #1 mechanical lens shutter, 1~1/400 sec., T (time), X contact (flash synchronization at all speeds)
Equivalent Focal Length for 35mm 62mm
Minimum Focusing Distance 2' 1.2" / 639mm
Magnification 0.36x
Area Covered 6.1 x 7.6" / 155 x 192mm
Filter Size 77mm
Lens Hood Screw-in
Dimensions (L x W) 2.9 x 3.8" / 74 x 97.2mm
Weight 1 lb. 12 oz. / 780 g.