Note the tip dated Feb 2017 on this site:http://www.danmccomb.com/modify-contax-zeiss-lenses-metabones-speedbooster/
The aperture-indexing ring can be removed in the process of doing the Leitax mount conversion. (NO NEED to grind off the tab, as Dan had done.)
Panasonic is introducing the Varicam 35 in a hobbled state. 60 fps initially, with higher frame rates to come “in a future firmware update.” As for a Panasonic RAW recorder (i.e., a recorder that is less expensive than the Codex)... they coyly indicate that they might be working on one.
Here's my personal experience with taking Panasonic at their word:
In 2013, I took delivery of Panasonic's new, top-of-the-line, $30,000 PX5000 ENG camera. It shipped with 60p/50p and 60i/50i (who shoots interlaced any more?!?) enabled, with 24p, 25p and 30p to come “in a future firmware update.”
OVER A YEAR LATER, the camera STILL does not shoot 1080 at 24p, 25p or 30p. Last week they released a firmware update with those frame rates… FOR A 720 DOWNSCALED IMAGE from the native 1080 sensor. I’m told the 1080 update will come by the end of the year, but in the meantime, I’ve had a virtually useless camera for over a year. It has 70 hours on it, which is a small fraction of what I’d normally do in a year. The lost income has been enormous.
In short, it has been a professional and financial DISASTER.
Beyond that problem, Panasonic's $7500 EVF for the camera has the worst shadow detail I've ever seen in a viewfinder. Per a Panasonic rep’s request, I dropped it off at a local vendor for him to pick up and take in for evaluation. A few days later, he called and said the service techs thought it looked fine… they wanted clarification on what the problem was. I sent examples, then went for three weeks without emails getting answered. Eventually he told me that he hadn’t even picked up the viewfinder; it was still at the vendor.
There's a lot about the Varicam 35 that looks very appealing, but I’ve gotten to the point where I feel like Panasonic has become a company that simply can’t be trusted any more.