Canon 300D Mod For Astrophotography And IR Imaging


[Jan-Erik Skata] recently had to perform surgery on his Canon 300D since the secondary mirror would not raise up (and if manually locked wouldn’t autofocus). His repair guide is good; you may remember his focus screen replacement. The thing I found really interesting was the site he referenced for his disassembly: Gary Honis’s Canon Digital Rebel (300D) Modification. Gary removes the IR cut glass from inside the camera and replaces it with a piece of clear glass. He then shows how to setup color correction and confirm that autofocus is still working correctly. He’s even got a mockup for how to add peltier cooling to the CMOS chip.

14 thoughts on “Canon 300D Mod For Astrophotography And IR Imaging

  1. Heat adds noise to the image, which appears as spots in the image — if you take a cheap webcam, point it at a dark surface, you’ll notice it. I’ve been wanting to do this to a camera for a while now… I’m so tempted :)

  2. i’ve seen where astonomers actually use liquid nitrogen to cool their ccds to get as clear a picture as possible. we should get those guys to start doing movie rips since they’re so quality concerned

  3. well, it doesn’t pay *not* to be obsessed with quality as an astronomer, no one wants to waste a couple weeks thinking they’ve found an asteroid on collision course with earth and then find out their ccd was too warm.

  4. Why bother with surface mount fuses on a board thats buried 2 or 3 layers deep in the camera??

    The basic idea of a fuse/breaker is to save a more expensive component. In this case if it was 200 EUR for a plastic pin, whatever component that those fuses was protecting would involve replacing an entire board or the labor to remove and reattach a significant chip.

    Having one components like this ‘saved’ by a fuse really doesn’t matter. Cannon could have saved a bit on each device by not having to install and design in those fuses too.

  5. Freiheit – if you read the text you will know that the fuse burned because I put the battery in while the camera was not completely assembled.
    This was clumsy. But actually I am looking for a scrap BG-E1 vertical grip to paint silver and add a fuse inside.

  6. “if you read the text you will know that the fuse burned because I put the battery in while the camera was not completely assembled.”

    I’m not questioning your specific project. I’m questioning why the *MANUFACTURER* put the fuse there in the first place.

    The idea of a fuse is that something goes amok, the fuse blows. Then you un-amok it, replace the fuse, and your widget works again. In this case replacing a fuse soldered to the PCB is as much work/expense as replacing whatever would have blown out.

  7. freiheit, it may be just as difficult, but these are not devices intended for consumer repair. besides, which would you rather have to replace, a fuse or the umpteen pixel CCD, or even some part of the lens, where you’d have to disassemble it and then reassemble it and colimate it. It’s like the circuit breakers in your house. You don’t have them because they’re easier than replacing your house, you have them because they’re cheaper than replacing your house.

  8. heheh, well, it also makes the aftermarket repairs easier as well. i remember saving more than one PSX because someone used a junk memory card that blew a fuse protecting the controller ports. just bridge where the fuse was and use good memory cards, good to effin go

  9. Jan-Erik,

    I really appreciate your article on replacing the broken pin. I was able to use your detailed pics to tear into my 300D to replace the stupid little orange battery clip that snapped off. Of course it took me two hours and lots of patience, but I guess it was better than paying Canon $250 to fix it. They still got me though. I couldn’t buy just the orange battery clip. I had to buy a main base plate assy. for $30 but it was still a cheaper alternative. Anyway, thanks. You might want to mention how to get out those two hidden screws that you must access from the rear of the camera by removing that black spacer by the memory card slot. I did some head-scratching on that part. Take care. Thanks again. Let’s keep our money out of greedy manufacturers hands!

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