The lens and other problems in Super 16 conversions.
Some Super 16 conversions are not up to par and somewhat confusing to the filmmakers as to lens and viewfinder coverage
of S16 frame. Short focal length lenses made for the 16mm film cameras and having F stop ratio number 1: 2. or higher (1: 2.8 )
are not likely to cover S16 frame. If the lens mount of converted camera is not centered with the optical axes of S16 frame the problem
gets worse.
See below the illustration of the  lens coverage of Super 16 and 16 mm frame. The lens orientation is not the only problem
concerning the good operation of the converted S16 camera but it is the most important.
Execution of combined small details can make a big difference. Focus distance and alignment of the Viewfinder system is also
creating problems in some S16 conversions.   

16mm frame vs. S16 frame 1)This frame shows the area of 16mm frame cropped for HD viewing. 2)This is a full Super 16 frame cropped for HD viewing. Compare images 1 and 2 for benefit of using the Super 16 format. 3)This image illustrates the viewing area when the converted camera is used for 16mm  frame. Just ignore the left side S16 area, the film will be exposed but the projector will mask off this unwanted image area and will be masked in copying project.

16mm. lens coverage This image shows the lens coverage and the  orientation of 16mm and S16 image area. The lens mount is moved to the optical center axes of Super 16 frame. This image shows the difference if the lens mount of the converted camera is  is left to its original position. The same lens that barely works for above illustration will not cover the S16 frame. The solution is to use a larger lens. 35mm SLR camera lens will do.

NEW ITEMS!
Use of a good quality 35mm SLR lens is a good alternative for
Bolex Super 16 cameras.
Bayonet lens mount is an ideal construction for use with 35mm camera lens. The adapter made for bayonet mount takes
rough handling and is strong to maintain a correct mounting distance using long focal length lenses.
There is an adapter available for mounting a Canon FD or Nikon F lens to Bolex C-mount. This approach is little riskier,
C-mount was designed for smaller and lighter 16mm camera lenses, using these bigger SLR camera lenses the turret
plate can get bent,  therefore changing  the mounting distance out of proper focus.


How does the 35mm camera lens work with 16mm Bolex H body film camera?
I tested with two SBM Super16 camera. Using 2pc. of  25mm lenses and 2pc. of 50mm. lenses. First test included one EBM having
a Canon 25mm FD lens mounted using  a BX-FD & FL adapter and the other EBM having a switar 25mm. lens mounted with a
bayonet to C-mount adapter. When focusing both cameras to same distant target the view angle and image coverage was the
same by visual inspection in aperture gate and in the viewfinder of both cameras.
The second test using 50mm focal length lenses in the same procedure,  yields the same result. In conclusion, using the 35mm. camera lenses with 16mm film camera, the excess area of the view will get cropped off by the aperture frame size, that is if the
lens mounting distance is correct for corresponding lens.
When 35mm SLR camera lens is used with appropriate adapter  made for Bolex Bayonet mount  or  C- mount camera,
the lens works the same as used with SLR camera.  What you see in the viewfinder is what goes to film gate.
All lens controls,  F: stop and  focus settings  work.  Using  properly collimated lens, infinity is in focus.
Note1: Bayonet to Canon FD & FL adapter does not work with Canon  EF lenses made for EOS cameras.
Note 2: Bolex C-mount Zoom lens does not work with C-mount to bayonet adapter.

Selection of Bayonet mount adapters
Made by JKCAMERA
Construction material  6061 aluminum alloy, black anodized coating.

Bayonet to Canon FD & FL lens adapter Selection of Canon FD lenses are available for Bolex  SB, SBM, EBM and EL cameras. Stock item $125.00	Bayonet to Nikon F Lens adapter Use this adapter with SB, SBM, EBM and EL cameras. Stock item  $145.00	Bayonet to C-mount RX lens adapter Made by JK Camera, these adapters are guaranteed to work as an original Bolex adapter. Stock item  $98.00

Lens modification for JK Optical Printers
and Bolex H16 Reflex cameras.

Kern Vario-Switar    POE Zoom lens.  1:1.9,   f=16-100

Selection of good quality short focal length lenses for Super 16 format.
I have tested all listed lenses, using a Kodak lens test reticule. All lenses registered the same number of line groups.
The details and sharpness of smallest group of lines was interpretable. In my opinion the Cooke and 26mm Switar registered the
sharpest image and a 25mm Switar the worst.

Resolution of TV lenses made for industrial imaging specifications (not commercial) are comparable to a
good film camera lens. These C-mount lenses are made for industrial custom application and need to be
re-collimated for Bolex Rx 16 C-mount distance.
Computar 12.5mm 1:1.3 Optical layout include 4 single elements and 2 Achromatic elements.
This lens is collimated for Bolex Rx mounting distance.
For the price you can not go wrong with this lens.   $125.00

Note that the F: stop is less than f:2 in all listed lenses, which indicates that any fast lens, having a large
diameter rear element is a good candidate for S16 use.

 

Micro-NIKKOR 55mm 1:2.8 Lens for Optical Printing 
The best lens to be used with JK Optical Printers. 
The most desired lenses  for optical printing are Nikon  Printing-Nikkor Lenses, the problem is that they are expensive, hard to find and too long  F.L. 
 for small table top JK Optical Printers. 
There is a affordable solution with near comparable results: Micro-Nikkor 55mm 1:2.8  is also a high quality lens designed for flat field micro photography.
It is  an ideal lens for 1:1 duplication, reduction or blow up of  small size images like 8mm, Super 8 and 16mm film frames. The original  mechanical
construction of this lens  prevents the front element moved close to  small film frame, which is essential for blow up work. The solution is: Save the
elements and rebuild the rest of the lens. 

This picture shows the size difference before and after the conversion work is done.	Lens has two iris settings: The red dot indicates iris is fully open for viewing and focus. The blue dot indicates 1:5.6 iris opening for shooting at maximum resolution of the lens.

Good deal, compare to $3000-$6000 Printing-Nikkor 
A new Micro-Nikkor 55/2.8 lens and modification    $465.00
Used Micro-Nikkor 55/2.8 lens and modification     $385.00
You supply the lens and we do the modification     $285.00
(Note that the lens must be clean, no fungus, oil or scratches on the lens elements)

Super 16

Using the modified Micro-Nikkor 55/2.8 lens and a Canon EOS Digital Rebel (300D) camera with JK Optical Printer: For 8mm. and Super8 projector frames use 3.5 inch extension tube.  For 16mm. and Super 16 projector frames use 1 inch extension tube.  For 35mm. 4 perforation pull down (Academy size), use no extension tube.  For 35mm. slide, use no extension tube and the bellows must be extra short or removed.

One inch extension        3.5 inch extension    US$ 28.00                         US$ 34.00

Meritex Products      email: jpkurhi@comcast.net