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How to modify PL mount on the cooke lens

Sergey Afanasiev

Sergey Afanasiev

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I've heard that it is possible to change PL mount on the cooke lens to EF mount... It makes some company from England.. But can not find this company. Somebody know this company? I have a cooke 18-100mm T3.
 
Wait, you can do that?!
I've wanted to Cooke S4i lenses, but only came in PL. With my C300 with EF mount, thats not really do-able.

Is this actually possible, and with any of the Cookes?
 
I am soon to examine this substitute mount that Vance refers to above to combine with a BMPCC Speedbooster for the SI2K.

http://www.ebay.com/itm/DSLR-PL-Lens...item54133414ad


It appears intended as a direct replacement for the Canon mount on the Canon body. Whether it is applicable to the C300 depends on the camera's mount ring being identical to the mount ring on the stills cameras. In interest of economies of scale for Canon, I imagine it would be.

Versus using an adaptor, a little more shoulder depth for the PL-Mount is likely gained. I expect that some PL-Mount lenses may not fit in the throat of the camera body behind the mount.

There is a possible problem for genuine PL-Mount lenses. The shoulder on the mount for Super16mm specimens I have examined is 12mm deep rearwards from the flange face. I do not know if 35mm specimens have a shorter shoulder.

That Chinese substitute mount appears to provide a depth of about 8mm rearwards of PL-Mount flange face. This means an extra 4mm for the shoulder has to be found from somewhere within the throat of the camera itself. The PL-Mount shoulder diameter is 54mm. The internal diameter of the Canon EF mount appears to be 53.5mm at its narrowest point behind the clearance diameter of 54mm for the lugs.

The attachment screws appear to be centred around a diameter of 59mm. It would be close but there may just be sufficient depth rearwards beyond the PL-Mount flange face within the Canon camera throat for the 12mm PL Mount shoulder to pass through the substitute mount.

Another issue may be that beyond the 12mm rearwards end of the PL-Mount shoulder, there is often bodywork on the lens which tapers 45 degrees inwards and rearwards from that point. There may not be space within the camera body throat for this.

The older Cooke Speed Panchro Series 2 ARRI-Standard or B-Mount lenses, are constructed within the entire mount shoulder which is significantly deeper than 12mm. It is a lesser diameter of 41mm but deeper penetration within the camera body throat 19mm rearwards of the PL-Mount flange face.

The stainless steel ARRI Standard/ARRI B-Mount adaptors for PL-Mount with internal threaded fixture appear to also have a 12mm shoulder. A stainless adaptor from China which fixes to the ARRI Standard/ARRI-B shoulder with 3 grubscrews on 120 degree radial centres is of a shorter shoulder length of 6mm to a 45 degree chamfer and 8mm of total penetration rearwards of the PL-Mount flange face.

PLease DO NOT use one of these grubscrewed adaptors on a Cooke Speed Panchro lens. The lens body is aluminium. Grub screws WILL crush the thin-walled alloy rear body cylinder onto the focus helicoid, ruin the lens focus system and possibly crack a rear element, not a fitting fate for a vintage lens.

I have one of these adaptors on an old Angenieux 25-250 zoom. The rear of the ARRI-B mount had been crudely filed or ground to fit an ARRI standard mount and had a flat bend from some past trauma, probably dropped which might explain a bent piece I found inside the zoom mechanism of the lens when I cleaned the fungus out.

I therefore machined the damaged end away from the ARRI B-MOUNT or whtaever it had become and this lens will offer up to a shallow mount adaptor without a problem. The lens structure itself does not intrude rearwards through the mount.

These notes are likely to be an inaccurate representation as I am using a P+S Technik IMS-Mount EF adaptor as a reference.

I understand that Cooke S4 lenses may have a deeper body penetration rearwards of the PL-Mount flange face than some other types.


PLEASE HEED SERIOUSLY, the expert opinions of contributors such as Optitek, Duclos lenses and True Lens Service if they respond to this post. My comments are observational and backyard at best. They get their hands dirty, metal shavings in their fingertips and know exactly what they are talking about.


Notes on this PL-Mount to EF adaptor listed lenses which cannot be used. The deeper clearance of a directly mounted adaptor may allow some of the non-fitting lenses to be used.

http://www.ebay.com/itm/PL-mount-le...ens_Adapters_Mounts_Tubes&hash=item3cc2a8d874
 
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The PL pilot diameter on Cooke 18-100, 20-100, 25-250, Angenieux 17-102, 25-250 HR Optimo series 15-45, 28-76, 24-290, 17-80, 24-250 etc. is short enough (under 7mm) that this adapter you pointed at (http://www.ebay.com/itm/PL-mount-len...item3cc2a8d874) will fit and work. Most primes won't because the same pilot diameter is too long and they will simply not go deep enough into the adapter to lock the PL .
Hope that helps ...
 
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