pressing "the judgement switch" sounds funny. Or frightening. Sound like the red button Trump and Korea Kim claim to have the bigger of.
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fullstop said:"auto crop" was introduced as a "stop gap fix" by Nikon
jolyonralph said:Addressing a few points here.
1) The mount in the image has seven data pins. The EF mount has eight pins (the Extenders have a few more though and lenses that work with the extender have the pads to connect to these). The EF-M mount has nine pins.
So, the mount in the image is a mock-up of a generic mount. Nothing more.
fullstop said:"auto crop" was introduced as a "stop gap fix" by Nikon when after years of preaching "DX is more than enough" they changed course in mid-stream and introduced FX bodies. So they a lot of customers sitting on DX lenses and wanted to tell them they can continue to use them on new FX cameras as well. Yes, technically they can. But no, in my opinion it still does not make sense in real life. It is a waste of precious sensor real estate and basically a "marketing trick".
canonnews said:fullstop said:"auto crop" was introduced as a "stop gap fix" by Nikon
that's why both Sony and Nikon do it, and canon is the only one that does not.
just because you don't like it doesn't make it a valid use case.
canonnews said:The idea place to split this is with mirrorless system that probably requires faster and more immediate adjustments than the DSLR EF mount.
CafferyPhoto said:What protocols do the other companies (Sony, Nikon) use?jolyonralph said:this patent is just about communication protocols
There is quite a bit of information about the existing lens protocol in the patent, it is described as a serial protocol. Since the communication protocol is from the 1980's, I suspect that its deadly slow. As to cost, its likely pennies per lens, it appears in even low end lenses like the 50mm 1.8 that costs about $10 to build.HarryFilm said:CafferyPhoto said:What protocols do the other companies (Sony, Nikon) use?jolyonralph said:this patent is just about communication protocols
From an electrical point of view I am assuming a 2-bit, 3-bit or 4-bit parallel protocol much like the old-time Centronics printer ports but with less pins! In this case I suspect depending upon the number of pins on various mounts that Canon uses 2 data pin + 2 ground pins, or 3 data pins and 3 ground, or 4-pins for data and 4 pins for ground.
It could also be a serial protocol such as RS-232 or RS-422 like they used on old-style video cameras and editing decks. In terms of speed the Baud rate (in bits per second) Canon should be able to get between 56k/baud up to 384k/baud and depending upon the error correction protocol used which needs extra bits, it could be between 6000 bytes per second up to 48,000 bytes per second which is PLENTY to get and set various lens parameters at up to 120 frames per second! This means it would be CHEAP to produce (less than $3 per lens) because if they tried doing a micro-USB style serial communications system at MANY megabytes per second, it would cost between $10 to $150 extra per lens depending upon the lens parameters needed to be get/set and powered!
HarryFilm said:CafferyPhoto said:What protocols do the other companies (Sony, Nikon) use?jolyonralph said:this patent is just about communication protocols
From an electrical point of view I am assuming a 2-bit, 3-bit or 4-bit parallel protocol much like the old-time Centronics printer ports but with less pins! In this case I suspect depending upon the number of pins on various mounts that Canon uses 2 data pin + 2 ground pins, or 3 data pins and 3 ground, or 4-pins for data and 4 pins for ground.
It could also be a serial protocol such as RS-232 or RS-422 like they used on old-style video cameras and editing decks. In terms of speed the Baud rate (in bits per second) Canon should be able to get between 56k/baud up to 384k/baud and depending upon the error correction protocol used which needs extra bits, it could be between 6000 bytes per second up to 48,000 bytes per second which is PLENTY to get and set various lens parameters at up to 120 frames per second! This means it would be CHEAP to produce (less than $3 per lens) because if they tried doing a micro-USB style serial communications system at MANY megabytes per second, it would cost between $10 to $150 extra per lens depending upon the lens parameters needed to be get/set and powered!
It's reportedly SPI running at ~80kHz clock sync. No need for slave select because back in the 80s no one expected to have more than 1 MCU in the lens.mb66energy said:If it is SPI (a synchronous serial interface using a common clock)
mb66energy said:While the main content of the patent is about communication protocols the most interesting detail for me is
the ASPECT RATIO shown for the (possible) sensor (area). Maybe some preparation for larger than 36x24 mm sized sensors for future medium format sensors or multi-format large area to exploit the 43mm image circle of FF lenses in e.g. square format (31x31mm, very hypothetical I think).
WoodyWindy said:mb66energy said:While the main content of the patent is about communication protocols the most interesting detail for me is
the ASPECT RATIO shown for the (possible) sensor (area). Maybe some preparation for larger than 36x24 mm sized sensors for future medium format sensors or multi-format large area to exploit the 43mm image circle of FF lenses in e.g. square format (31x31mm, very hypothetical I think).
I was wondering if I was the only one who had noticed that. But, I agree with others pointing out that the primary purpose of this patent is the communication protocols (which, really, is questionably patentable material given serial communications' long history of protocol negotiation - but that's a whole 'nother story.) The imagery is probably just placeholder, and meant to convey the general concept of application
Kit. said:It's not a sensor, it's a mirror box. Which needs to be bigger than a sensor, especially in the vertical dimension.
Its all about the manner in which the speed change is done without adding a additional contact as was required in the previous patent. Since the existing lenses must work with it, the method of detecting and switching is what sets it apart.Kit. said:It's reportedly SPI running at ~80kHz clock sync. No need for slave select because back in the 80s no one expected to have more than 1 MCU in the lens.mb66energy said:If it is SPI (a synchronous serial interface using a common clock)
Actually, I'm surprised that negotiation for higher speeds done at lower speed of the same serial protocol is patentable at all.