Smart assistants are now everywhere
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Location trackers for your important items
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AR & VR headsets are now becoming mainstream
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Headphones with smart assistants are now available too
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What new tech gadgets are you buying this year?
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Developing a speed booster for DSMC 2,
Getting to this point has involved a huge amount of R&D and trial and error, so for some of this I will only be talking in general terms rather than specifics.
Confirmed key features:
- Metabones Optics
- Optimised design that allows for the best possible optical performance at fast F0.9 apertures.
- Full EF & PL electronic compatibility.
So if you are reading this you will probably have researched or have used the ABT Speedmount, which is the only comercial speedbooster for DSMC 2 cameras.
The ABT Speedmount is a beautiful looking lens mount and you can tell that it had a huge amount of thought and time poured into its creation.
It’s honestly an amazing achievement given the limited space they had available for optics on the DSMC 2 system, but sadly there are some significant compromises.
With the Cinelux Speedbooster Mount for DSMC2, I am aiming for it to be a a significant improvement over the ABT Speedmount by overcoming the compromises in there design
Learning from the mistakes of the ABT Speedmount
Poor Lens performance at fast apatures.
One of the major advantages of the focal reducer is the ability to leverage these extremely fast apatures that wouldn’t normally be possible.
The optical performance of the ABT speedmount was surprising as it was very good at apertures above T2.8, but would start to struggle with anything faster than that. It would get worse at very fast apertures to the point of being unusable.
The image would suffer from a milkyness and a haze around the key areas of focus.
This immediately seemed odd not only because of the price but because it was developed in conjunction with the superb lens designer Brian Caldwell. He designed the metabones optics that offer performance so good they actually can improve lens image quality at fast apertures. So what happened and how can the Cinelux Speed-booster mount change this?
When you look at the front and rear optic you can tell straightaway that they don’t look like every other focal reducer optic on the market, especially the ones that Brian Caldwell himself has produced.
The font of the optic isn’t radically different but it does stray from his standard design where the edges of the front optic are chamfered at an angle. This allows excess light to hit them and then bounce into the optical flocking to absorb and reduce the internal reflections.
At the rear is where things get interesting! The lens is squared off in a way that I haven’t seen on any other metabones optics, and the only reason I can think for doing this is because they ran out of space.
Their main intention with this mount was to get it to function on all DSMC 2 cameras. To do that they had massive limitations on space.
This was the first challenge to work through! Finding a way to maximise / increase the space available without compromising the optics quality.
Achieving full DSMC 2 Compatibility
The ABT Speedmount was designed so that it would be compatable with every variation of DSMC 2 cameras. This isn’t widely known but early DSMC2 cameras have much less room within the OLPF cavity which drasticly reduces space for an optic.
To overcome this issue, the Cinelux Speed Booster mount will take advantage of the extra space in the later cameras, so it wont be compatible with very early DSMC2 cameras.
The Canon EF logic board
ABT used the RED Canon EF VV Mount to control the EF lenses that would attach to there Speedmount. The reason they used the VV version is because it has a slightly larger opening on the board compared to the S35 version to allow an optic to pass through.
At the moment the Cinelux mount will be based upon the same principle of using a genuine RED Canon EF mount PCB to allow lens control. The Cinelux design will be based upon the much more common, RED Canon EF S35 Mount with the smaller opening. This may seem counterintuitive, but the solution for getting an optic to pass through the board is simple, and that is to not get it to pass through at all.
We will do this by simply removing the EF control board out of the Optical path by relocating it. The setup for this relocation is very neat and there will be more details to follow, but the important points are that it is ultra slim and fits non-intrusively on the camera, is weather sealed and uses robust IP68 connections.
Optical enhancements
There were also some parts of the ABT design that looked like they could introduce unwanted contrast issues & when working on the Fujinon MK mount I learnt that it was crucial to get this right.
If you take a look at any latest generation Metabones Speedbooster Ultra mounts, you will see that it will be using an internal flocking to help absorb stray light and remove any chance of internal reflections. The Cinelux mount will also be using this internal flocking as well.
Sensor Stack Thickness
I have been able to get accurate readings of the total optical filter stack from DSMC 2 cameras by physically dismantling them. This has allowed me to accurately test and find the perfect focal reducer optic for DSMC2 cameras.
