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Author Topic: Open Source CMOS Medium Format Camera/Back - An initial exploration  (Read 41887 times)

RichDesmond

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Re: other makers of larger than 35mm format sensors, for uses like medical
« Reply #140 on: March 17, 2014, 07:53:28 pm »

I'd go ahead and get the Canon - I rate my chances of finishing the job (getting something usable by third parties outside a lab) at 5%, my chances of getting to a tethered lab version at 20%.

Also, I think I will encourage the use of 35mm retrofocus wides initially, because the symmetrical designs need really precise mounting, and tolerances will get worse due to a small sensor, even if I use an Alpa for testing.

The status of the project is that I've got a feel for the requisite hardware architecture, have located suppliers for the custom processing electronics and am preparing to order evaluation electronic kits.

Edmund

I'll probably do that regardless, I understand the hurdles. :) But that wouldn't preclude me from trying your system also if it becomes available.
FWIW, a tethered solution is fine for me, and I think anything you can do to minimize complexity will greatly increase your changes of having a workable system.
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synn

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Re: other makers of larger than 35mm format sensors, for uses like medical
« Reply #141 on: March 17, 2014, 11:03:22 pm »

Mostly landscapes, with some architecture interiors (mainly churches) Nothing really long (100mm equiv) Wides mostly, which I realize may be a problem.

A Canon FF with the 17 and 24 TS lenses (and others, of course) is a workable solution, but I've been mulling over the tech camera route for a while now. Not in a huge hurry, this is all for a project my wife and I are slooowly working on. My retirement is a couple of years away, that's when we'll get serious and the pace will pick up.

A Hartblei Hcam / Alpa FPS with a digital back and Canon T/S lenses sounds perfect for your needs IMO.
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eronald

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Re: other makers of larger than 35mm format sensors, for uses like medical
« Reply #142 on: March 17, 2014, 11:23:39 pm »

A Hartblei Hcam / Alpa FPS with a digital back and Canon T/S lenses sounds perfect for your needs IMO.

I agree. Or an Arca Swiss.

I'm seriously thinking of getting one of the above as a base for my own project - much cheaper because I own the lens and don't need the back :)

Edmund
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hjulenissen

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Re: Open Source CMOS Medium Format Camera/Back - An initial exploration
« Reply #143 on: March 18, 2014, 04:14:53 am »

Kind of a long shot here... How different are camera sensors really from display panels? Obviously, camera sensors convert light to a voltage (or some other suitable electric information carrier), while displays convert voltage to light (talking about e.g. OLED here, not backlighted LCD panels).

Displays can be manufactured at really large sizes and reasonably high density (4000x2000x3 elements), obviously motivated by the willingness of people to pay money for large, detailed displays. Could the large display manufacturers switch their production line for one evening, making a bunch of 10" diagonal "retina" sensors?

I guess it fundamentally is a question about the difference between a photodiode and a light-emitting diode?
http://en.wikipedia.org/wiki/Active-pixel_sensor#Pixel
http://en.wikipedia.org/wiki/Light-emitting_diode#Physics

-h
« Last Edit: March 18, 2014, 04:19:56 am by hjulenissen »
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eronald

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Re: Open Source CMOS Medium Format Camera/Back - An initial exploration
« Reply #144 on: March 18, 2014, 05:14:15 am »

The ISORG guys I posted about earlier are adapting the flexible display production line of Plastic Logic to make their flexible sensors.


Edmund

Kind of a long shot here... How different are camera sensors really from display panels? Obviously, camera sensors convert light to a voltage (or some other suitable electric information carrier), while displays convert voltage to light (talking about e.g. OLED here, not backlighted LCD panels).

Displays can be manufactured at really large sizes and reasonably high density (4000x2000x3 elements), obviously motivated by the willingness of people to pay money for large, detailed displays. Could the large display manufacturers switch their production line for one evening, making a bunch of 10" diagonal "retina" sensors?

I guess it fundamentally is a question about the difference between a photodiode and a light-emitting diode?
http://en.wikipedia.org/wiki/Active-pixel_sensor#Pixel
http://en.wikipedia.org/wiki/Light-emitting_diode#Physics

-h
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RichDesmond

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Re: other makers of larger than 35mm format sensors, for uses like medical
« Reply #145 on: March 18, 2014, 08:48:22 am »

A Hartblei Hcam / Alpa FPS with a digital back and Canon T/S lenses sounds perfect for your needs IMO.

Yep. :)  That (or something very similar) may be what I end up with.
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torger

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Re: Open Source CMOS Medium Format Camera/Back - An initial exploration
« Reply #146 on: March 20, 2014, 04:35:20 am »

Here's another really large CMOS sensor, strange form factor though (150 megapixel 157x27.5mm):

http://www.gpixelinc.com/en/Newsinfo.aspx?m=20140313105347500252
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MichaelEzra

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Re: Open Source CMOS Medium Format Camera/Back - An initial exploration
« Reply #147 on: April 29, 2014, 08:53:03 pm »

A good friend of mine (from Israel) is offering for sale a Nikon D600 body with a damaged lens mount - it somehow broke off along with a small part of the camera body.
The damage occurred due to a very light impact to the 70-200mm lens while it was attached to the camera. Lens did not suffer:)
Camera & sensor itself is fully functional. US Nikon refused to repair this damage stating that "camera is beyond economical repair".
Please let me know if there is any interest to use this as a base for development, and your offer. I have the camera in my possession in NYC.

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eronald

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Re: Open Source CMOS Medium Format Camera/Back - An initial exploration
« Reply #148 on: April 29, 2014, 09:13:55 pm »

A good friend of mine (from Israel) is offering for sale a Nikon D600 body with a damaged lens mount - it somehow broke off along with a small part of the camera body.
The damage occurred due to a very light impact to the 70-200mm lens while it was attached to the camera. Lens did not suffer:)
Camera & sensor itself is fully functional. US Nikon refused to repair this damage stating that "camera is beyond economical repair".
Please let me know if there is any interest to use this as a base for development, and your offer. I have the camera in my possession in NYC.



Michael,

 Thank you for the offer. Give me a day, I will ask my friends how hard it is to use this chip, and how it is attached.

Edmund
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