Canon EOS 20D to 20Da ?! - DSLR Hack development - CHDK Forum
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Canon EOS 20D to 20Da ?!

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Offline loglouis

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Canon EOS 20D to 20Da ?!
« on: 09 / October / 2008, 12:13:29 »
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Hi,

I have spent a lot of time on internet to search a firmware mod for the Canon EOS 20D that could (and might) add a few useful functions....But I did not find an answer/file/website who is talking about a project. 

I would like to know, if it's possible to to transform a Canon EOS 20D to a 20Da (the 20Da is exactly and technically the same as the 20D.The 20Da has just an infrared filter).

Anyone tried to flash the 20D with the 20Da firmware ?!

I know a firmware mod is very difficult...but...is it possible to reprogram the firmware ?!

Thanks in advance,  :)

Louis.
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Offline DataGhost

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Re: Canon EOS 20D to 20Da ?!
« Reply #1 on: 09 / October / 2008, 18:50:42 »
How is it exactly the same when the only difference is in some piece of hardware and, as I understand, not in firmware?
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Offline loglouis

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Re: Canon EOS 20D to 20Da ?!
« Reply #2 on: 10 / October / 2008, 10:45:25 »
The change made to the 20Da over the 20D is the replacement of the "hot mirror" IR filter which covers the CMOS sensor on the 20D.

The only difference is the IR filter but nothing on hardware.

The 20Da has got the liveview feature, and i just would like to know if it's possible to install a 20Da firmware on a 20D to have this function.

Thanks :)
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Offline vostok

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Re: Canon EOS 20D to 20Da ?!
« Reply #3 on: 10 / October / 2008, 15:30:52 »
Live view isn't possible with a sensor not designed to do live view. What properties of 20Da would you want for your 20D? I bet they can not be done by firmware.
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Offline loglouis

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Re: Canon EOS 20D to 20Da ?!
« Reply #4 on: 11 / October / 2008, 14:48:22 »
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Offline vostok

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Re: Canon EOS 20D to 20Da ?!
« Reply #5 on: 16 / October / 2008, 16:02:38 »
Sorry, but you are wrong. 20Da has a special type of sensor that allows the use of live view. The live view function in 20Da is crumpy. The function found in new cameras (40D, 450D, 1000D, 5D mkII) is way better and more flexible.

Also the IR-filter is not just "added". All digital cameras require a filter in front of the sensor to block infrared light. Unfortunately for astronomers, hydrogen nebulae emit light at a wavelength (color) of really deep red, almost infrared. This wavelength doesn't make it completely through the IR blocking filter in normal cameras, only 15% gets through.

The IR blocking filter on the 20Da is merely different in a way that it let's a little bit more red through, allowing this certain wavelength to get through completely. 20Da is also able to take normal photos.

So you can't make 20D to become a 20Da by any means, firmware or hardware. You can open 20D up and replace the filter with a more-red-permitting one (these are sold by Baader Planetarium for instance), so you'll be able to better shoot nebulae.

You can't get live view with anything less than buying a model that has live view.
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Offline ditch

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Re: Canon EOS 20D to 20Da ?!
« Reply #6 on: 19 / November / 2008, 12:24:39 »
i thought the 20Da had a different filter on the sensor designed for astrophotography, and that's what sets it apart from the 20D. otherwise, they are twins.
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Offline barret

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Re: Canon EOS 20D to 20Da ?!
« Reply #7 on: 16 / January / 2009, 13:45:55 »
you're absolutely right, or at least that's what wikipedia says:
Quote
The IR filter of the 20Da passes 2.5 times as much light at around this 656 nm wavelength as does the filter of the 20D, allowing more fine detail to be revealed in long exposures of emission nebulae. A separate IR filter must be attached to the lens in order to use the 20Da to capture images similar to those seen by the human eye.

so, 20Da has weaker IR filter, so it can be used in astrophotography, while ordinary 20D has ordinary (strong) IR filter, so images look almost as we humans see it.

i don't think it has anything to do with live view.
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