All dimensions are still not final! Work in progress...
Interface Shield 1 Concept
4K HDMI Plugin Module Work in Progress
|Axiom Beta Model||16mm||Four Thirds||Super35|
|Brand||CMOSIS|| ON Semionductor
|Shutter Type||Pipelined Global Shutter||Global & Rolling Shutter||Pipelined Global Shutter|
|Color filter Array|| Bayer (Color model)|
None (B/W model)
|Anti-Aliasing Filter (OLPF)||no|
|Size|| 10.6 mm × 5.94 mm
ø 12.1 mm
| 18.8 mm × 14.1 mm
ø 23.5 mm
| 22.5 mm × 16.9 mm|
ø 28.2 mm
|Crop Factor|| Full Frame ∕ 3.56
16mm Film ∕ 1.05
| Full Frame ∕ 1.84
Four Thirds ∕ 0.96
| Full Frame ∕ 1.54|
Super35 ∕ 1.10
|Pixel Resolution (h × v)||1920 × 1080||4000 × 3000||4096 × 3072|
|Pixel Size||5.5 µm||4.7 µm||5.5 µm|
|Dynamic Range|| 10 stops
15 stops (HDR mode)
| 9.3 stops (Gobal Shutter)
12 stops (Rolling Shutter)
| 10 stops|
15 stops (HDR mode)
|Sensitivity||200 ISO||~ 400 - 1250 ISO|
|Max Frame Rate @ Bit Depth|| 340 fps @ 10 bit
70 fps @ 12 bit
| 110 fps @ 8 bit
70 fps @ 10 bit
30 fps @ 12 bit
10 fps @ 14 bit
| 300 fps @ 10 bit|
180 fps @ 12 bit
The AXIOM Beta has 2 medium speed IO interfaces to be used with "shields".
There are 2 high speed IO interfaces where "plugin modules" can be hot plugged
All PCBS we created for the AXIOM Beta (beside the AXIOM Beta Mainboard) have an onboard EEPROM. These chip provide between 4KB and 16KB of non-volatile memory. Our primary use for these EEPROMs is to store unique identifiers for each board/type. In a modular stack of PCBs the camera firmware can read the EEPROMs of each PCB and identify which boards, versions and revisions are attached (as different board versions might need different drivers/firmware elements).
2 byte board type identifier (65.536 possible values):
00 - AXIOM Beta Powerboard 01 - AXIOM Beta Interface Board 02 - AXIOM Beta Sensor Frontend 03 - AXIOM Beta Single Slot Plugin Module 04 - AXIOM Beta Dual Slot Plugin Module 05 - AXIOM Beta Low Speed Shield 06 - AXIOM Beta Medium Speed Shield
1 byte board output identifier:
number of output interfaces
1 byte board active/passive identifier
4 byte board current draw range identifier
2 bytes typical low end range in mA 2 bytes typical high end range in mA
2 byte board length in mm
1 byte number of used LVDS lanes
1 byte number of used GPIO channels
2 byte board identifier:
00 - AXIOM Beta Powerboard 01 - AXIOM Beta Interface Dummy 02 - AXIOM Beta Interface Board 03 - AXIOM Beta CMV12000 ZIF Sensor Frontend 04 - AXIOM Beta CMV12000 Socket Sensor Frontend 05 - AXIOM Beta 1x HDMI Plugin Module 06 - AXIOM Beta 3x Displayport Plugin Module 07 - AXIOM Beta 1x PMOD Plugin Module 08 - AXIOM Beta 3x PMOD Plugin Module 09 - AXIOM Beta 1x HDMI IN Plugin Module 0A - AXIOM Beta Dual Riser Plugin Module 0B - AXIOM Beta Debug Shield
2 byte board version identifier
(ASCII A.BC corresponding to label printed on PCB)
2 byte board revision identifier
(ASCII A.BC corresponding to label printed on PCB)
128 byte UUID
Voucher holders get at-cost hardware upgrades and replacements. But any voucher holder can decide at which stage they actually acquire the current AXIOM Beta hardware. Software upgrades are and will always be free and publicly available. You can at any time upgrade or downgrade your camera software.
Intended for developers and early adopters - first generation that is currently being shipped - small production batch size of around 20 - 30 cameras.
The Beta requires two 5V inputs (one for the Microzed, one for the rest of the hardware). Each 5V supply should be able to provide at least 2-3A. The total power consumption in normal operation was measured to be around 10W. During boot up there are spikes of higher power consumption.
Each AXIOM Beta ships with an external AC power supply that provides 5V and 6-8A.
An external battery needs to provide two clean and accurate 5V supplies rated at 2 Amps or more. We have witnessed a battery that could not provide the required peak currents and resulted in visible horizontal "wave" noise artifacts being visible in the image of the Beta.
For connecting the Beta to dual USB power supplies a special cable is required:
1x Molex 87439-0500 Pico Spox 5pin Housing 4x Molex 87421-0000 Pico Spox Crimp Terminal AWG24 4x 19x36AWG - 45x40AWG 24AWG Flexible Cable 2x CNC Tech 1002-024-01300 CONN USB A TYPE SOLDER ASSY 2x CNC-Tech 1001-027-BL-01000 CONN HOOD USB A MALE BLACK CNC-Tech 1001-026-BE-01000 CONN HOOD USB A MALE BEIGE
TODO: add picture of assembled dual USB cable here.
We have successfully tested the following USB battery packs with the Beta so far:
When evaluation a new battery/power supply we recommend using two USB power meters between camera and battery: https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Delectronics&field-keywords=usb+current+meter
Battery mount for NP-F970/F750/F550 batteries to power the AXIOM Beta. Includes power usage and capacity monitoring to estimate remaining charge and time remaining.
More Thoughts on Power.
Proprietary protocol from Sony that exchanges metadata between batteries and devices. Expected data inside the protocol includes: charge cycles, battery ID, remaining total capacity, remaining current capacity, etc. Only official Sony batteries incorporate this protocol, cheap replacement parts don't and some Pro Sony cameras refuse operation with batteries without InfoLithium communication. Decrypting this protocol could give us more insight into the battery but is not essential as we can measure the discharge curve and estimate remaining capacity rather accurately that way.
Still in concepting phase of development.
AXIOM Beta is outfitted with an E Mount currently. We provide adapters for Canon EF & Nikon F (Commlite) mounts. Further adapters like PL, etc are widely available.
We have not had a chance to test any speedbooster directly on the camera but are keen on community reports here.
|Mount||Nikon F||Canon EF||Micro Four Thirds|
|Compatible Lenses||Nikkor FX||Nikkor DX||EF||EF-S (optionally)|
|Image Circle Size|| Full Frame
ø 43.3 mm
ø 28.4 mm
| Full Frame
ø 43.3 mm
| Canon APS-C
ø 27.3 mm
| "Half Frame"|
ø 21.6 mm
|Throat||44 mm||54 mm||~38 mm|
|Flange focal distance||46.5 mm||44 mm||19.25 mm|
| Axiom Beta
More Details: Lens Mounts
Image sensors are typically sensitive to a wider spectrum than the human eye. So we use an Infrared (IR) / Ultraviolet (UV) cut off filter that acts as an optical bandpass. These filters work with a reflective coating that cuts below 390nm and above 750nm.
We recommend this filter brand: https://www.amazon.de/Haida-Digital-Slim-Filter-inkl/dp/B00CGGZ786
With the AXIOM Beta developer kits we use this filter "externally" - screwed to the lens thread. With very wide angle lenses (< 16mm focal length) this can lead to visible color shift vignetting.
Ultimately the goal is to incorporate a UV/IR cut off filter into the camera body on top of the image sensor.
Proposal: Buy 100x100mm filter from http://www.uqgoptics.com/catalogue/Filters/IR_CUT_OFF_FILTERS.aspx?subCatOrCatName=ir_cut_off_filters and cut into 3x3 pieces
An optical low-pass filter is used to reduce/eliminate moire and aliasing artifacts which would otherwise be visible when filming some types of subject matter (detailed repeating patterns like meshes, grills, brick walls). Although post-production workarounds exist, they aren't usually as effective and remnants of moire will often remain.
For a filter to be effective and also not excessively blur the image, it needs to be designed for a specific sensor pixel size. The Cmosis CMV12000 and CMV2000 have the same pixel size (5.5µm), but the Kodak On-Semi KAC12040 is 4.7µm. A different filter might be needed for the latter.
Filters of different thickness and refractive indexes placed between the back of the lens and sensor will shift the back focus to some degree. Any combination of OLPF and IR/UV filters needs to be carefully designed to avoid this. A buyer might request a camera without an OLPF, but still with an IR/UV filter. How can this be accommodated? Some filter manufacturers sell combined OLPF/UV glass of varying thickness which might be a solution.
Typical cost for a Super35/APS-C sized filter seems to be around $200/€187 - Red sell one for their cameras at this price.
A Twitter poll was run to get user feedback. Question; "How important is an Optical Low-Pass Filter (OLPF/AA-filter) for you?". Results on 2017-04-06;
So a combined 58% of users opted for either quite important or essential.
List of possible manufacturers:
This has been renamed to "AXIOM Bridge" and is currently still in the concept phase of development.
Notes & Discussion Topics:
Switchable ND Filters not planned currently
PCB Stack (work in progress): https://cad.onshape.com/documents/58833d76000df10fe2249f8a/w/1e208f70f250bcc59aa74d03/e/51df8678a0ad64b69c121f5f
Skeleton and Skeleton Footplate: https://github.com/apertus-open-source-cinema/beta-hardware/tree/master/Enclosure/Skeleton_E-mount
Onshape PCB Stack and Skeleton Assembly: https://cad.onshape.com/documents/58bd498285673a104722aacd/w/466b8105bf6807b3f4f50b6c/e/b33cc7b3cc3cc5eebd5c2ae6
The Simple Enclosure is meant to wrap a "skin" around the camera electronics and skeleton CNC milled metal parts. The Simple Enclosure is designed in a way that it can be produced with any consumer 3d printer.
Another kind of simple enclosure. The transparency is useful to showcase the camera and explain the different compenents inside, and to understand quickly what is going on by looking at the different status LEDs. The design is made so it can be laser cut with a 3mm thick acrylic glas (choose your color !)
Simple transparent enclosure for the AXIOM Beta, version 0.2.
Key : Black => to be cut ; Red => to be engraved ; Green => comments (not to be cut or engraved)
Open and edit with Inkscape.
Improvement possible : make the case slightly bigger (few mm wider for the front and back side), so the HDMI cable can fit nicely in the enclosure (and you don't need to shave some plastic off the cable).
Versions of the AXIOM Beta will be named AXIOM Beta plus the according roman number.
eg. AXIOM Beta I - Developer Edition