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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Canon K-35 Aspherical BNCR "Super Speed"

The 24 mm T1.6 Canon K-35 conversion to PL is complete. It looks beautiful! It meets my standard of a conversion that looks like the lens was made that way at the factory. I'll post photos later today.
 
K-35 24 mm T1.5 Conversion Completed...

K-35 24 mm T1.5 Conversion Completed...

Here it is, as promised...

Canon_K-35_24mm_T_1,4_PL_Conv.jpg


This is the prototype, made entirely in my shop (except the stainless PL mount). Custom adapter part sits underneath the PL mount (with is a stock Zeiss 8-screw type) and is held on by the four stainless cap screws. Hole in PL cone enlarged to clear the entire rear element to protect the FF 35 coverage.

A *lot* of work... but worth it, I think.

I will consider making more of the custom adapter if other K-35 owners are interested. It's possible that my adapter will work with the 18 mm K-35 as well. I need to get one in the shop to measure and confirm this.

BTW, I just noticed: Lens is labeled 24 mm T1.6, T-stop ring reads T1.5.

Enjoy...
 
David W. Jones said:
If memory serves, there were three sets of K35's.
One speed and two super speed.

Great work Jorge!
Click to expand...

Thanks David!

Now on to the much tougher lenses 35, 55, 85 mm :yikes:

By speed you mean f2.0, and super speed f1.2~1.4 right?
 
Looks great, Jorge, very nice work. Are you sure they will all cover FF35?
 
Last year, things got really slow business wise, and I made the decision to try to do the type of jobs that I would normally turn away.

Having converted a personally owned Canon K-35 85mm from BNCR to PL (a very difficult conversion) I decided to look into converting the other lenses. I determined that it was very difficult, but possible.

I did convert two 24 mm lenses for different clients, an image of one of them is shown earlier in this thread. But the work was extremely difficult and ultimately unprofitable. Of all the lenses, the 18 and 24 mm are the only ones that can be converted with a straightforward process.

I was having to invest in very costly high precision tooling in order to do the work, but since the lenses were older, no one was willing to pay thousands for the conversions (which is what the work was really worth). Because these lenses were made in such limited numbers, there was little possibility of amortizing the many hours of measuring, CAD drawings, making custom tooling etc, because there were so few lenses to convert.

It became necessary for me to move on when I was offered the opportunity to come to Los Angeles to work for AbelCineTech as their West Coast Optical Technician.

I will no longer be doing these type of conversions. I suggest that anyone interested in this contact Jaceck at Optitek to see if he is still interested in doing it.
 
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