George Tsai


Have 2 items

Sunday, 19 April 2015 00:00

50mm and 135mm FD Lenses

I've converted a 135mm F2.5 FD lens to PL mount and added permanent gears to it. For the 50mm F1.4 I just added permanent gears since the optical placements made it impossible to remount to PL. Both lenses have been de-clicked and apreture arm that's normally at the camera end of the lens have been removed. The 135mm lens works ok, not as smooth as one would like but it is in working order and the lens itself looks great. The 50mm works great very smooth for the most part, but has a color cast to it. 

The base design for the gear itself is the same for all of the rings. 

Published in Engineering

Originally I just set out to make a dumb EF mount so I can use my one canon lens with my Epic. The project ended up with FD mount, a PL mount, and on top of that directors viewfinder.

The EF and FD mounts themselves are metal and salvaged from old broken 35mm film cameras, by printing a base for these mounts I can use it with the Red Epic. Flange focal distance is very close to where it needs to be, and for fine tuning adjustments I'll just have to spend extra time adding shims between then mounts and the printed base. 

After salvaging the parts from the cameras, I realized I could print an enclosure using the viewfinder parts of the camera and make a directors viewfinder. After several attempts I was able to get the positioning of the plastic "ground-glass", penta-prism, and viewfinder lens just right. It only made sense to use the same mount as the Red Epic, that way I can easily use any mount on either of them:-P I also made inserts that can be fitted in through the front that basically frames up for the actual sensor size used. So with this directors viewfinder, you can see exactly what you'll see in frame as you would on the camera. 

Overall, everything works surprisingly well. A few tweeks here and there and it's golden:-)

3 of the attached images below were shot on my Epic with one of the printed EF mount using my Canon 18-55 EFs lens and 1 was with a Canon 50mm FD lens:-P

So I've made more than one.... Anyone interested?


(4/23/15) Update: Available now through my webstore!

Published in Engineering

A little about me

profile.largeGeorge Tsai attended California State University, Long Beach and graduated in 2010 with BS in Electrical Engineering, Audio Engineering, and an Entrepreneurship Minor. He is also a United States Marine with combat deployments to both Iraq and Afghanistan. He concluded his service with an honorable discharge as a Sergeant. Today, he freelances in the film industry with his Red Epic-X camera package and production audio equipment. He is also the founder of FUZE Ti.  Read more...

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